Strip double-crank flying shear with improved knife gap stability

Abstract

The application discloses a plate strip double-crank flying shear with improved knife gap stability, which comprises an upper knife holder assembly, a lower knife holder assembly, the upper knife holder assembly further comprising a locking assembly and a knife gap adjusting assembly; the locking assembly is installed on the upper part of the upper knife holder and is used for pressing and fixing the upper knife holder after the knife gap of the upper blade is adjusted; the knife gap adjusting assembly is installed on the middle part of the upper knife holder, the knife gap adjusting assembly is installed on the lower end of the upper knife holder through an adjusting seat, an inclined guide rail is matched with the inclined surface of the upper knife holder, the two are pressed through a pressing plate, the upper blade is installed on the upper knife holder, and a scale pointer is arranged on the upper knife holder; when adjusting, the inclined guide rail is driven to move through rotating the adjusting screw rod, so that the upper knife holder is pushed to move forward and backward, and the gap between the upper blade and the lower blade is adjusted. The application solves the problem of the increasing knife gap in the shearing process, avoids the shearing burrs on the cut surface of the plate and the phenomenon that the thin plate cannot be sheared, and improves the shearing precision of the flying shear and the quality of the finished product.

Description

Technical Field

[0001] This invention belongs to the field of sheet metal processing and manufacturing technology. Specifically, it relates to a double-crank flying shear for sheet metal strips that improves blade gap stability. Background Technology

[0002] With the rapid development of modern logistics and distribution in China, customers, primarily in the automotive, home appliance, shipbuilding, and container industries, are demanding increasingly personalized services for steel plate sales. They require diverse specifications, small batches, high dimensional accuracy, and short delivery cycles. Therefore, shearing and efficient nesting of steel plates has become the primary sales model for steel mills and large distributors, leading to a growing demand for cold-rolled coil leveling and shearing production lines. Flying shears are one of the key pieces of equipment on plate cross-cutting production lines.

[0003] When a flying shear machine is shearing steel plates, the upper and lower blades generate huge lateral forces. This huge lateral force will push the gap between the upper and lower blades to increase, resulting in large shearing burrs on the cut edge. Shearing thin plates may even result in failure to cut them, which seriously affects the surface quality of the cut surface.

[0004] To ensure that the horizontal position between the upper and lower tool holders remains unchanged during relative movement, existing technology incorporates a bearing rolling mechanism on the upper and lower tool holders. In production practice, it has been observed that shearing medium-thick plates proceeds relatively smoothly, but when shearing thin plates, large burrs or incomplete shearing easily occur. Analysis reveals that the main reason is insufficient rigidity of the rolling guide and bearings. The enormous lateral force generated by the blade at the moment of shearing causes minute elastic deformation in the rolling guide and bearings. Since the blade gap is already very small when shearing thin plates (only a few micrometers), this elastic deformation has a significant impact.

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention is proposed. Summary of the Invention

[0006] To address the issue of increased blade gap during shearing and prevent the formation of shear burrs on the cut surface of the sheet material, as well as the inability to cut thin sheets, this invention provides a double-crank flying shear for sheet and strip with improved blade gap stability.

[0007] The technical solution provided by this invention is as follows:

[0008] A strip double-crank flying shear with improved blade gap stability includes an upper blade holder assembly, which includes an upper blade holder 2 with an upper blade 5 installed. The entire upper blade holder assembly is rotated and driven by a pair of upper crankshafts 4 disposed in the upper blade holder assembly to perform up-and-down shearing motion. A lower blade holder assembly includes a lower blade holder 8 with a lower blade 10 installed. The entire lower blade holder assembly is rotated and driven by a pair of lower crankshafts 7 disposed in the lower blade holder assembly to perform up-and-down shearing motion.

[0009] The upper tool post assembly also includes a locking component 1 and a tool gap adjustment component 3;

[0010] The locking assembly 1 is installed on the upper part of the upper tool holder 2 and is used to press and fix the upper blade 5 onto the upper tool holder 2 after the blade gap of the upper blade 5 is adjusted.

[0011] The tool gap adjustment assembly 3 is installed in the middle of the upper tool holder 2 and includes an adjustment screw 301, an adjustment seat 302, a scale pointer 303, an inclined guide rail 304, a pressure plate 305, and an upper tool holder 306.

[0012] The tool gap adjustment assembly 3 is installed at the lower end of the upper tool holder 2 via the adjustment seat 302. The inclined guide rail 304 cooperates with the inclined surface of the upper tool holder 306, and the two are pressed together by the pressure plate 305. The upper blade 5 is mounted on the upper tool holder 306, and the upper tool holder 306 is provided with a scale pointer 303. During adjustment, the inclined guide rail 304 is driven to move by rotating the adjustment screw 301, thereby pushing the upper tool holder 306 to move back and forth, thereby adjusting the gap between the upper blade 5 and the lower blade 10.

[0013] It also includes a synchronous guide rail 12, with the upper tool post assembly mounted on the upper part of the synchronous guide rail 12, and the lower part of the synchronous guide rail 12 connected to the lower tool post 8 via a ball linear guide rail 11; the upper tool post assembly and the lower tool post assembly always maintain synchronous motion in the vertical direction when the upper crankshaft 4 and the lower crankshaft 7 rotate.

[0014] The preferred technical solution provided by this invention is as follows:

[0015] It also includes an additional guide rail pair 6, which includes an upper guide rail 602 mounted on an upper guide rail seat 603 at the lower part of the upper tool holder 2 and a lower guide rail 601 mounted on the upper part of the lower tool holder 8.

[0016] Furthermore,

[0017] The upper guide rail seat 603 is fixed in the groove of the upper tool holder 2 by a countersunk hexagonal screw, the upper guide rail 602 is fixed to the side of the upper guide rail seat 603 by a countersunk hexagonal screw, and the lower guide rail 601 is fixed to the side of the groove of the lower tool holder 8 by a countersunk hexagonal screw.

[0018] Furthermore,

[0019] The contact surface of the upper guide rail 602 has a grinding allowance. During assembly, the contact side of the upper guide rail 602 is ground to ensure that when the upper guide rail and the lower guide rail coincide, the sliding surface has a contact gap of 0.01mm.

[0020] The upper guide rail 602 is made of cold work die steel Cr12MoV, which has very good impact toughness and high wear resistance, and the quenching hardness requirement is HRC58~63.

[0021] The lower guide rail 601 is made of wear-resistant white cast iron, grade KmTBCr20Mo, which has good impact toughness and high wear resistance, with a quenching hardness of HRC55-58. This effectively avoids the problems of poor wear resistance, short service life, and even breakage under high-frequency impact loads.

[0022] Furthermore,

[0023] The lower guide rail 601 has a cross-shaped lubrication reservoir 6011 and an oil hole 6012 on its contact surface, and the upper guide rail 602 also has a cross-shaped lubrication reservoir 6021 and an oil hole 6022 on its contact surface. An oil injection hole 81 is provided at the corresponding position of the lower tool holder 8. This effectively avoids the problem of friction, adhesion, and seizing.

[0024] Furthermore,

[0025] Both the lower guide rail 601 and the upper guide rail 602 are provided with a 15° entry guide slope.

[0026] The preferred technical solution provided by this invention is as follows:

[0027] The locking assembly 1 includes a cylindrical roller bearing 101, a connecting plate 102, a push rod 103, an eccentric shaft 104, a pull rod 105, and a locking handle 106;

[0028] The locking assembly 1 is installed on the upper end of the upper tool holder 2. By rotating the locking handle 106, the eccentric shaft 104 is driven to rotate, thereby pushing the top rod 103 to move up and down with the connecting plate 102 and the pull rod 105, thus completing the locking of the tool gap adjustment assembly 3.

[0029] Preferred,

[0030] The inclined guide rail 304 has an oil groove 3041 on its side, and the upper tool holder 306 has an oil hole 3061 on its inclined surface.

[0031] Preferred,

[0032] The upper end of the synchronous guide rail frame 12 is fixedly connected to the upper tool holder 2 by key 9.

[0033] Beneficial effects:

[0034] This invention solves the problem of increased blade gap during shearing, preventing burrs on the cut surface of the sheet metal and ensuring that thin sheets cannot be cut. The results are excellent; under such high-frequency impact loads, the shearing process is very stable and reliable after the blade gap is adjusted. Its performance far exceeds our design expectations, significantly improving the shearing accuracy and finished product quality of the flying shear. Attached Figure Description

[0035] Figure 1This is a structural schematic diagram of an embodiment of the present invention.

[0036] Figure 2 This is a side view structural diagram of an embodiment of the present invention.

[0037] Figure 3 This is a three-dimensional structural diagram of an embodiment of the present invention.

[0038] Figure 4 A three-dimensional structural diagram of locking component 1

[0039] Figure 5 A schematic diagram of the three-dimensional structure of the eccentric shaft 104.

[0040] Figure 6 This is a three-dimensional structural diagram of the upper tool holder 2.

[0041] Figure 7 3D structural diagram of tool gap adjustment component 3

[0042] Figure 8 A schematic diagram of the three-dimensional structure of the inclined guide rail 304.

[0043] Figure 9 A three-dimensional structural diagram of the upper tool holder 306.

[0044] Figure 10 A schematic diagram of the three-dimensional structure of the upper crankshaft 4 and the lower crankshaft 7.

[0045] Figure 11 A three-dimensional structural diagram of the additional guide rail pair 6

[0046] Figure 12 This is a three-dimensional structural diagram of the lower guide rail 601 and the upper guide rail 602.

[0047] Figure 13 A three-dimensional structural diagram of the upper guide rail seat 603.

[0048] Figure 14 A three-dimensional structural diagram of the lower tool holder 8

[0049] Figure 15 A three-dimensional structural diagram of the synchronous guide rail frame 12.

[0050] Meaning of the markings in the attached diagram:

[0051] 1. Locking assembly,

[0052] 101. Cylindrical roller bearing; 102. Connecting plate; 103. Push rod; 104. Eccentric shaft; 105. Tie rod; 106. Locking handle;

[0053] 2. Upper tool holder; 3. Tool gap adjustment assembly.

[0054] 301. Adjusting screw; 302. Adjusting seat; 303. Scale pointer; 304. Slanted guide rail;

[0055] 3041. Inclined guide rail oil groove;

[0056] 305. Pressure plate; 306. Upper tool holder;

[0057] 3061. Upper tool holder oil hole;

[0058] 4. Upper crankshaft, 5. Upper blade, 6. Additional guide rail pair,

[0059] 601. Lower guide rail;

[0060] 6011. Lower guide rail oil groove; 6012. Lower guide rail oil hole;

[0061] 602. Upper guide rail;

[0062] 6021. Upper guide rail oil groove; 6022. Upper guide rail oil hole;

[0063] 603. Upper guide rail seat;

[0064] 7. Lower crankshaft, 8. Lower tool post,

[0065] 81. Oil injection hole;

[0066] 9. Key, 10. Lower blade, 11. Ball linear guide, 12. Synchronous guide bracket. Detailed Implementation

[0067] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0068] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention. Figure 2 This is a side view of the structure according to an embodiment of the present invention. Figure 3 This is a three-dimensional structural diagram of an embodiment of the present invention, combined with... Figure 1 , Figure 2 as well as Figure 3The present invention provides a strip double-crank flying shear for improving blade gap stability, comprising an upper blade holder assembly, which includes an upper blade holder 2 on which an upper blade 5 is mounted, and the entire upper blade holder assembly is rotated and driven by a pair of upper crankshafts 4 disposed on the upper blade holder assembly to perform up-and-down shearing motion; and a lower blade holder assembly, which includes a lower blade holder 8 on which a lower blade 10 is mounted, and the entire lower blade holder assembly is rotated and driven by a pair of lower crankshafts 7 disposed on the lower blade holder assembly to perform up-and-down shearing motion;

[0069] The upper tool post assembly also includes a locking component 1 and a tool gap adjustment component 3;

[0070] like Figure 4 As shown, the locking assembly 1 is installed on the upper part of the upper tool holder 2, and is used to press and fix the upper blade 5 onto the upper tool holder 2 after the blade gap adjustment is completed;

[0071] Specifically, the locking assembly 1 includes a cylindrical roller bearing 101, a connecting plate 102, a push rod 103, an eccentric shaft 104, a pull rod 105, and a locking handle 106;

[0072] The locking assembly 1 is installed on the upper end of the upper tool holder 2. By rotating the locking handle 106, the eccentric shaft 104 is driven ( Figure 5 (As shown in the figure) Rotation drives the top rod 103 to move up and down along with the connecting plate 102 and the pull rod 105, thereby locking the tool gap adjustment assembly 3.

[0073] like Figure 7 As shown, the tool gap adjustment assembly 3 is mounted on the upper tool holder 2 ( Figure 6 The middle part (shown in the figure) includes an adjusting screw 301, an adjusting seat 302, a scale pointer 303, an inclined guide rail 304, a pressure plate 305, and an upper tool holder 306.

[0074] The tool gap adjustment assembly 3 is installed at the lower end of the upper tool holder 2 via the adjustment seat 302. The inclined guide rail 304 cooperates with the inclined surface of the upper tool holder 306, and the two are pressed together by the pressure plate 305. The upper blade 5 is mounted on the upper tool holder 306, and the upper tool holder 306 is provided with a scale pointer 303. During adjustment, the inclined guide rail 304 is driven to move by rotating the adjustment screw 301, thereby pushing the upper tool holder 306 to move back and forth, thereby adjusting the gap between the upper blade 5 and the lower blade 10.

[0075] The inclined guide rail 304 is provided with an oil groove 3041 on its side. Figure 8 As shown in the figure, the upper tool holder 306 has an oil hole 3061 on its inclined surface. Figure 9 (as shown in the image).

[0076] It also includes the synchronous guide rail frame 12 ( Figure 15 As shown in the diagram, the upper tool post assembly is mounted on the upper part of the synchronous guide rail frame 12. Figure 2 , Figure 3 As shown in the figure, the upper end of the synchronous guide rail frame 12 in this embodiment is fixedly connected to the upper tool holder 2 by key 9.

[0077] The lower part of the synchronous guide rail 12 is connected to the lower tool post 8 through the ball linear guide rail 11; when the upper tool post assembly and the lower tool post assembly rotate on the upper crankshaft 4 and the lower crankshaft 7, they always maintain synchronous motion in the vertical direction.

[0078] Combination Figure 11 , Figure 12 , Figure 13 As shown, the technical solution of the present invention also includes an additional guide rail pair 6, which includes an upper guide rail 602 mounted on an upper guide rail seat 603 at the lower part of the upper tool holder 2 and a lower guide rail 601 mounted on the upper part of the lower tool holder 8.

[0079] The upper guide rail seat 603 is fixed in the groove of the upper tool holder 2 by a countersunk hexagonal screw, the upper guide rail 602 is fixed to the side of the upper guide rail seat 603 by a countersunk hexagonal screw, and the lower guide rail 601 is fixed to the side of the groove of the lower tool holder 8 by a countersunk hexagonal screw.

[0080] The contact surface of the upper guide rail 602 has a grinding allowance. During assembly, the contact side of the upper guide rail 602 is ground to ensure that when the upper guide rail and the lower guide rail coincide, the sliding surface has a contact gap of 0.01mm.

[0081] The upper guide rail 602 is made of cold work die steel Cr12MoV, which has very good impact toughness and high wear resistance, and the quenching hardness requirement is HRC58~63.

[0082] The lower guide rail 601 is made of wear-resistant white cast iron, grade KmTBCr20Mo, which has good impact toughness and high wear resistance, with a quenching hardness of HRC55-58. This effectively avoids the problems of poor wear resistance, short service life, and even breakage under high-frequency impact loads.

[0083] The lower guide rail 601 has a cross-shaped lubrication reservoir 6011 and an oil hole 6012 on its contact surface, and the upper guide rail 602 also has a cross-shaped lubrication reservoir 6021 and an oil hole 6022 on its contact surface. The lower tool holder 8 has an oil injection hole 81 at a corresponding position. Figure 14 (As shown in the image). This effectively avoids the problem of friction, adhesion, and seizing.

[0084] As a further preferred technical solution, both the lower guide rail 601 and the upper guide rail 602 are provided with a 15° entry guide slope.

[0085] The specific working process of this invention is as follows:

[0086] Before production, loosen the locking handle 106, and adjust the lead screw 301 to drive the inclined guide rail 304 to move according to the thickness of the sheet metal to be cut. Adjust the appropriate blade gap between the upper and lower blades (see the scale pointer 303), and then pull down the locking handle 106 to press the upper blade holder 306 through the locking assembly 1.

[0087] During the shearing motion, the ball linear guide 11 always ensures that the upper and lower tool holder assemblies move synchronously in the vertical direction.

[0088] When the movement reaches the shearing stage (the sides of the upper blade 5 and the lower blade 10 overlap), the sides of the upper guide rail 602 and the lower guide rail 601 begin to overlap, ensuring that the lateral component of the shearing force is distributed to the contact friction surface of the upper and lower guide rails, so that the shearing gap of the shearing blade remains basically stable and unchanged, avoiding the generation of shearing burrs on the cut surface of the sheared sheet and the phenomenon that thin plates cannot be sheared.

[0089] Oil reservoirs are provided on the sides of both the upper and lower guide rails to ensure sufficient lubrication of the friction surfaces. During the non-shearing idle stroke phase, the upper and lower guide rails do not contact each other, and this time is used to dissipate heat from the guide rail surfaces.

[0090] Additional guide rail pair 6 requires a specific lubricating grease. Due to the high-speed impact extreme pressure load here, the requirements are particularly stringent, and the temperature is extremely high, necessitating the selection of a grease with specific properties. Here, extreme pressure composite aluminum-based grease (grade SH / T0534-1992), viscosity grade 0#~2#, is selected, suitable for high-load applications in the range of -20℃~160℃. To ensure adequate lubrication of the friction surfaces, it is recommended to apply grease twice per shift.

[0091] The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A strip double-crank flying shear with improved blade gap stability, comprising an upper blade holder assembly, the upper blade holder assembly including an upper blade holder (2) on which an upper blade (5) is mounted, the entire upper blade holder assembly being rotated and driven by a pair of upper crankshafts (4) disposed in the upper blade holder assembly to perform up-and-down shearing motion; a lower blade holder assembly, the lower blade holder assembly including a lower blade holder (8) on which a lower blade (10) is mounted, the entire lower blade holder assembly being rotated and driven by a pair of lower crankshafts (7) disposed in the lower blade holder assembly to perform up-and-down shearing motion; characterized in that: The upper tool holder assembly also includes a locking component (1) and a tool gap adjustment component (3); The locking assembly (1) is installed on the upper part of the upper tool holder (2) and is used to press and fix the upper tool holder (306) on the upper tool holder (2) after the tool gap of the upper blade (5) is adjusted. The tool gap adjustment assembly (3) is installed in the middle of the upper tool holder (2) and includes an adjustment screw (301), an adjustment seat (302), a scale pointer (303), an inclined guide rail (304), a pressure plate (305), and an upper tool holder (306). The tool gap adjustment assembly (3) is installed at the lower end of the upper tool holder (2) via the adjustment seat (302). The inclined guide rail (304) is engaged with the inclined surface of the upper tool holder (306), and the two are pressed together by the pressure plate (305). The upper blade (5) is mounted on the upper tool holder (306), and the upper tool holder (306) is provided with a scale pointer (303). During adjustment, the inclined guide rail (304) is driven to move by rotating the adjustment screw (301), thereby pushing the upper tool holder (306) to move back and forth, thereby adjusting the gap between the upper blade (5) and the lower blade (10). It also includes a synchronous guide rail frame (12), the upper tool post assembly is installed on the upper part of the synchronous guide rail frame (12), and the lower part of the synchronous guide rail frame (12) is connected to the lower tool post (8) through a ball linear guide rail (11); when the upper tool post assembly and the lower tool post assembly rotate on the upper crankshaft (4) and the lower crankshaft (7), they always maintain synchronous motion in the vertical direction. It also includes an additional guide rail pair (6), which includes an upper guide rail (602) mounted on an upper guide rail seat (603) at the lower part of the upper tool holder (2) and a lower guide rail (601) mounted on the upper part of the lower tool holder (8). The upper guide rail seat (603) is fixed in the groove of the upper tool holder (2) by a countersunk hexagonal screw, the upper guide rail (602) is fixed to the side of the upper guide rail seat (603) by a countersunk hexagonal screw, and the lower guide rail (601) is fixed to the side of the groove of the lower tool holder (8) by a countersunk hexagonal screw. The contact surface of the lower guide rail (601) is provided with a cross-shaped lubrication reservoir (6011) and an oil hole (6012), and the contact surface of the upper guide rail (602) is also provided with a cross-shaped lubrication reservoir (6021) and an oil hole (6022). The corresponding position of the lower tool holder (8) is provided with an oil injection hole (81). The upper end of the synchronous guide rail frame (12) is fixedly connected to the upper tool holder (2) by a key (9); The locking assembly (1) includes a cylindrical roller bearing (101), a connecting plate (102), a push rod (103), an eccentric shaft (104), a pull rod (105), and a locking handle (106). The locking assembly (1) is installed on the upper end of the upper tool holder (2). By rotating the locking handle (106), the eccentric shaft (104) is driven to rotate, thereby pushing the top rod (103) to move up and down with the connecting plate (102) and the pull rod (105) to complete the locking of the tool gap adjustment assembly (3).

2. The strip double-crank flying shear for improving blade gap stability according to claim 1, characterized in that, The contact surface of the upper guide rail (602) has a grinding allowance. During assembly, the contact side of the upper guide rail (602) is ground to ensure that when the upper guide rail (602) and the lower guide rail (601) overlap, the sliding surface has a contact gap of 0.01mm.

3. A strip double-crank flying shear for improving blade gap stability according to claim 1, characterized in that, The upper guide rail (602) is made of cold work die steel Cr12MoV, with a quenching hardness requirement of HRC58~63; the lower guide rail (601) is made of wear-resistant white cast iron, with a quenching hardness of HRC55~58.

4. A strip double-crank flying shear for improving blade gap stability according to any one of claims 1-3, characterized in that, Both the lower guide rail (601) and the upper guide rail (602) are provided with a 15° entry guide slope.

5. A strip double-crank flying shear for improving blade gap stability according to claim 1, characterized in that, The inclined guide rail (304) is provided with an oil groove (3041) on its side, and the upper tool holder (306) is provided with an oil hole (3061) on its inclined surface.

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