Flexible bending center hinge knife device and pull rod type working method

Abstract

The invention discloses a flexible bending center hinge knife device and a pull rod type working method, and belongs to the technical field of flexible bending centers. Comprising a pressing die, and hinge knives are installed at the two ends of the pressing die; the hinge cutter comprises a pressing cutter mother cutter and a pressing cutter side cutter, and one side of the pressing cutter mother cutter is provided with a stepped surface and a curved groove; a cover plate is mounted on the stepped surface; a linear part and a bent part are arranged in the curved groove, and the bent part is arranged towards the middle of the pressing die; a fixing hole is formed in the cutter pressing side cutter, a first pin shaft is installed in the fixing hole, and the first pin shaft penetrates through the fixing hole and slides in the curve groove. A connecting plate and a bearing spring are installed on the upper portion of the cutter pressing side cutter, a second pin shaft is installed at the bottom of the connecting plate, and the connecting plate is connected with the cutter pressing side cutter through the second pin shaft. A connecting pin shaft is installed on the top of the connecting plate and connected with the bottom end of the bearing spring. According to the blanking device, the technical problem that blanking interference is caused by the flange of a pressing die due to bending caused by the flange when the workpiece is blanked after being bent to generate the flange is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of flexible bending centers, and in particular relates to a flexible bending center hinge knife device and a pull rod type working method. Background Art

[0002] In industrial processing, bending operations of flexible materials often occur, and the bending degree and bending accuracy of traditional bending machines cannot meet the manufacturing requirements of flexible materials. In addition, the bent parts often return to their original shapes. If manual bending is used, the bent parts can be prevented from recovering from deformation, but it is difficult to ensure accuracy and bending angle. Therefore, for the bending process of flexible materials, it is a very important innovation for bending equipment to solve this problem.

[0003] Flexible bending center: It can bend complex shapes of various combinations such as right angles, non-right angles, arcs, up and down bends, etc., and complete multilateral bending in one positioning. It is used in the metal forming field of different industries and different workpieces. At present, flexible bending centers are gradually replacing CNC bending machines.

[0004] In the existing flexible bending center, a pressing die is installed to press the workpiece, and a folding die is used to flange the workpiece; if the workpiece has a flange, there is interference with the tool during material cutting, which makes material cutting inconvenient and there is a problem of material blocking. For example, CN201710111221.X describes a flexible bending center in which a pressing block in the pressing die is provided with multiple groups of parallel installations.

[0005] The hinge knife in the prior art, such as the CN202210900263.2 flexible bending center slide rail pneumatic hinge knife, realizes the rotation effect of the hinge knife, but the actual solution is the life problem, and there is an inner groove at the tip, which cannot achieve the effect of the hinge knife moving to give way.

[0006] Therefore, it is necessary to propose a new flexible bending center hinge knife device and a pull rod type working method to solve this problem. Summary of the invention

[0007] The purpose of the present invention is to provide a flexible bending center hinge knife device and a working method to solve the technical problem raised in the above background technology that the workpiece is bent to produce flanging, and when the workpiece is unloaded, the bending caused by the flanging is blocked by the pressing die, thereby resulting in obstruction and interference in the unloading of the workpiece, causing a flexible bending center error and shutdown.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] The flexible bending center hinge knife device comprises a pressing die, and hinge knives are installed at both ends of the pressing die; the hinge knife comprises a pressing knife mother knife and a pressing knife side knife, and a step surface is arranged on one side of the pressing knife mother knife, and a curved groove is arranged on the step surface;

[0010] A cover plate is detachably mounted on the stepped surface;

[0011] The curved groove includes a straight portion and a curved portion, and the curved portion is arranged toward the middle of the pressing die; that is, the side knives of the pressing knives on both sides bend inward after descending to conveniently make way for the flanging of the workpiece and facilitate the unloading of the workpiece.

[0012] A fixing hole is provided in the press knife side knife, and a pin shaft 1 is installed in the fixing hole. The pin shaft 1 is suitable for passing through the fixing hole and sliding along the curved groove to drive the press knife side knife to move and rotate;

[0013] A connecting plate and a load-bearing spring are installed on the upper part of the knife-pressing side knife, a pin shaft 2 is installed at the bottom of the connecting plate, and the knife-pressing side knife is connected through the pin shaft 2; a connecting pin shaft is installed on the top of the connecting plate, and the connecting pin shaft is connected to the bottom end of the load-bearing spring.

[0014] In a further technical solution, the knife pressing tool at the top of the stepped surface is provided with a mounting groove 1, and the mounting groove 1 is connected to the stepped surface;

[0015] A connecting hole 1 is provided in the installation groove 1, an upper bolt is installed in the connecting hole 1, and the upper bolt is fixed in the connecting hole 1; the top of the load-bearing spring is connected to the upper bolt.

[0016] In a further technical solution, a second installation groove is provided on the step surface, and the second installation groove is U-shaped. The second installation groove is suitable for installing a connecting plate, and the connecting plate moves vertically along the second installation groove; both the first installation groove and the second installation groove are opened vertically downward.

[0017] In a further technical solution, the connecting plate is provided with an upper pin hole and a lower pin hole, the upper pin hole is suitable for the connecting pin to pass through; the lower pin hole is located at the bottom of the upper pin hole and is suitable for the connecting pin to pass through;

[0018] The diameter of the upper pin hole is greater than the diameter of the lower pin hole, and the horizontal length of the top of the connecting plate is matched with the horizontal spacing of the second mounting groove.

[0019] In a further technical solution, a limiting cylinder, a baffle and a second baffle ring are installed on the connecting pin shaft, and the limiting cylinder is fixedly installed on the side of the connecting pin shaft relative to the knife pressing mother knife; a baffle is installed on the end of the limiting cylinder away from the connecting pin shaft;

[0020] A positioning ring groove is provided on the limiting cylinder; the limiting cylinder is suitable for passing through the upper pin hole and is restricted in the upper pin hole by installing a second retaining ring, and the outer diameter of the limiting cylinder is adapted to the inner diameter of the upper pin hole;

[0021] The bottom of the load-bearing spring is connected to the connecting pin.

[0022] In a further technical solution, the cover plate is provided with a first positioning hole and a waist-shaped hole, and the side of the knife pressing mother knife opposite to the cover plate is provided with a second positioning hole, the first positioning hole and the second positioning hole are adapted to each other, and the first positioning hole and the second positioning hole are suitable for installing a fixing screw to connect;

[0023] The end of the connecting pin shaft away from the knife pressing mother knife is suitable for passing through the waist-shaped hole and extending to the outer end of the cover plate;

[0024] A closing portion is provided on the top of the cover plate, and the closing portion is suitable for closing the first installation slot.

[0025] In a further technical solution, the knife pressing side knife includes a bottom knife part and a column part, and the column part is provided with a position hole, a weight-reducing hole and a fixing hole from top to bottom; the position hole is suitable for the second pin to pass through, and the fixing hole, the weight-reducing hole and the position hole are distributed in a triangle;

[0026] The top of the column part is provided with an arc-shaped notch, and is suitable for connecting with the bottom of the connecting plate, and the position hole is installed in the arc-shaped notch.

[0027] A pull rod type working method of a flexible bending center hinge knife device comprises the following steps:

[0028] Step 1: Installation and positioning

[0029] A plurality of pressing dies are installed on the working table of the flexible bending center, and the pressing dies include a plurality of pressing knives. Flexible bending center hinge knife devices are symmetrically installed on both sides of the pressing dies.

[0030] The bottom end of the initial position of the press knife side knife is horizontal, and the working state of the press knife side knife is that the bottom end rotates toward the middle of the pressing die;

[0031] Step 2: A mounting opening is provided on the top of the pressing knife, and the mounting opening is mounted corresponding to the mounting assembly to form a pressing die;

[0032] Step 3: Installation of hinge knife device

[0033] a. Install the connecting pin first, pass the limiting cylinder on the connecting pin through the connecting plate and fix it in the positioning ring groove with retaining ring 2 to limit the limiting cylinder on the connecting plate;

[0034] b. Pin shaft 1 and pin shaft 2 are installed on the side cutter of the press cutter, the end of pin shaft 1 is in the curved groove, pin shaft 2 passes through the position hole and is installed in the curved groove, and retaining ring 1 is installed on both pin shaft 1 and pin shaft 2, and retaining ring 1 is located outside the curved groove;

[0035] c. Install the load-bearing spring. Hooks are provided at both the upper and lower ends of the load-bearing spring. The bottom hook of the load-bearing spring is connected to the connecting pin. The upper bolt is installed in the connecting hole 1 in the installation groove 1. The hook at the upper end of the load-bearing spring is connected to the upper bolt. The inner diameter of the top hook is smaller than the outer diameter of the head of the upper bolt.

[0036] d. Install the cover plate to cover the stepped surface and installation groove 1; and install the fixing screw in the positioning hole 1 to connect the closing cover plate and the knife pressing mother knife;

[0037] Step 4, install the pull rod pusher, after the workpiece is flanging at the flexible bending center;

[0038] When the press knife side knife needs to be rotated, the pull rod pusher outputs downward, pushes the connecting pin shaft extending from the waist-shaped hole to descend along the waist-shaped hole, drives the pin shafts 1 and 2 on the press knife side knife to move along the curved groove, and when the connecting pin shaft is located at the bottom of the waist-shaped hole, the bottom knife part of the press knife side knife reaches the limit position of rotation; the pull rod pusher stops outputting and maintains the state;

[0039] Complete workpiece unloading;

[0040] Step 5: Complete the reset:

[0041] When the press knife side knife is not in use for rotation, the pull rod pushes the member upward to disengage the connecting pin extending out of the waist-shaped hole. Under the elastic restoring force of the load-bearing spring, the connecting pin drives pin one and pin two to move in the opposite direction upward to realize the reverse rotation of the press knife side knife.

[0042] In a further technical solution, the pull rod pusher includes a mounting plate, a stepper motor is mounted on one end of the mounting plate, a driving gear is mounted on the output end of the stepper motor, a sliding rack is mounted on the mounting plate, and the driving gear is meshed and connected with the sliding rack;

[0043] A pull rod is installed at the bottom of the sliding rack. A bayonet portion is provided at the bottom of the pull rod and is suitable for being movably connected with a connecting pin shaft.

[0044] In a further technical solution, a transverse guide rail is installed on the flexible bending center, and the mounting plate is installed in the transverse guide rail and is suitable for sliding in the transverse guide rail; a transmission chain is also installed on the mounting plate, one end of the transmission chain is fixedly connected to the mounting plate, and the other end is connected to the flexible bending center.

[0045] Beneficial Effects

[0046] (1) The present invention can keep the side knives of the press cutter horizontal on both sides of the pressing die when the workpiece is not being fed, so as to realize the flanging of the workpiece and facilitate the bending of the flanging workpiece; when the workpiece is being fed, the pull rod pusher pushes the pull rod downward to realize the side knives of the press cutter sliding and rotating along the curved groove along with the pin shaft 1 and the pin shaft 2. The present invention has a clear structure and can quickly realize the giving way action of the workpiece feeding in the flexible bending center, without the need for the overall contraction of the entire pressing die to achieve the separation from the interference with the edge of the workpiece after flanging.

[0047] (2) The present invention utilizes the straight portion and the curved portion in the curved portion to realize the descending and rotating action of the press knife side knife by connecting the pin shaft, and the length of the curved portion is relatively short, which can produce a more convenient and rapid descending and rotating effect, thereby effectively reducing the interference with the unloading of the workpiece.

[0048] (3) The present invention is equipped with a load-bearing spring, which is clamped on the upper bolt and the connecting pin shaft at the upper and lower parts, so that when the pull rod is reset, the connecting pin shaft can be quickly reset under the action of the elastic restoring force of the load-bearing spring.

[0049] (4) The present invention adopts a stepper motor to drive the driving gear and the sliding rack to mesh and drive the sliding rack to move up and down, so that the pull rod at the bottom can be movably abutted against the connecting pin shaft, thereby driving the connecting plate to move downward, driving the pin shafts 1 and 2 to move along the curved groove, thereby realizing the rotation of the press knife side knife;

[0050] (5) If the bending and pressing dies can be spaced at different intervals, the mounting plate can be slid on the transverse guide rail to accommodate workpieces of different sizes, and the transmission chain can maintain transmission strength and wiring safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0052] Figure 1 It is a structural schematic diagram of the hinge knife device of the present invention;

[0053] Figure 2 An exploded view of the hinge knife device of the present invention;

[0054] Figure 3 for Figure 2 A magnified image of point A;

[0055] Figure 4 It is a structural diagram of a knife pressing mother knife of the present invention;

[0056] Figure 5 It is a structural diagram of the press knife side knife of the present invention;

[0057] Figure 6 is a structural diagram of a connecting plate of the present invention;

[0058] Figure 7 is a structural diagram of the cover plate of the present invention;

[0059] Figure 8 The internal schematic diagram of the hinge knife device of the present invention is Figure 1 ;

[0060] Fig. 9 The internal schematic diagram of the hinge knife device of the present invention is Figure 2 ;

[0061] Fig.10 It is a structural schematic diagram of the hinge knife device of the present invention installed in the flexible bending center;

[0062] Fig.11 for Fig.10 Enlarged view of part B.

[0063] In the figure: 1, press knife mother knife; 2, press knife side knife; 3, step surface; 4, cover plate; 5, straight part; 6, curved part; 7, fixing hole; 8, pin shaft 1; 9, connecting plate; 10, bearing spring; 11, pin shaft 2; 12, connecting pin shaft; 13, mounting groove 1; 14, upper bolt; 15, mounting groove 2; 16, upper pin hole; 17, lower pin hole; 18, limit cylinder; 19, baffle; 20, retaining ring 2; 21, positioning ring groove; 2 2. Positioning hole one; 23. Waist-shaped hole; 24. Positioning hole two; 25. Fixing screw; 26. Closing part; 27. Bottom knife part; 28. Column part; 29. ​​Position hole; 30. Weight reduction hole; 31. Pressing die; 32. Mounting port; 33. Retaining ring one; 34. Mounting plate; 35. Stepping motor; 36. Driving gear; 37. Sliding rack; 38. Pull rod; 39. Horizontal guide rail; 40. Flexible bending center; 41. Transmission chain. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0065] The application principle of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0066] Example 1

[0067] See also Figure 1-9As shown, it is an implementation scheme of the present invention, providing a scheme: a flexible bending center hinge knife device, including a pressing die 31, and hinge knives are installed at both ends of the pressing die 31; the hinge knife includes a pressing knife mother knife 1 and a pressing knife side knife 2, and a step surface 3 is provided on one side of the pressing knife mother knife 1, and a curved groove is opened on the step surface 3;

[0068] A cover plate 4 is detachably mounted on the stepped surface 3; in this embodiment, the stepped surface 3 has three sets of thickness, and the thinnest layer is provided with a curved groove, which includes a straight portion 5 and a curved portion 6, and the curved portion 6 is arranged toward the middle of the pressing die 31; a fixing hole 7 is opened in the press knife side knife 2, and a pin shaft 8 is installed in the fixing hole 7, and the pin shaft 8 is suitable for passing through the fixing hole 7 and sliding along the curved groove to drive the movement and rotation of the press knife side knife 2;

[0069] A connecting plate 9 and a load-bearing spring 10 are installed on the upper part of the pressure knife side knife 2, a pin shaft 11 is installed at the bottom of the connecting plate 9, and the pressure knife side knife 2 is connected through the pin shaft 11; a connecting pin shaft 12 is installed on the top of the connecting plate 9, and the connecting pin shaft 12 is connected to the bottom end of the load-bearing spring 10.

[0070] like Figure 4 As shown, the knife pressing mother knife 1 at the top of the step surface 3 is provided with a mounting groove 13, which is connected to the step surface 3; a connecting hole 1 is provided in the mounting groove 13, an upper bolt 14 is installed in the connecting hole 1, and the upper bolt 14 is fixed in the connecting hole 1; the top of the bearing spring 10 is connected to the upper bolt 14. A mounting groove 2 15 is provided on the step surface 3, the mounting groove 2 15 is U-shaped, and the mounting groove 2 15 is suitable for installing the connecting plate 9, and the connecting plate 9 moves vertically along the mounting groove 2 15; both the mounting groove 13 and the mounting groove 2 15 are opened and arranged vertically downward.

[0071] like Figure 6 As shown, the connecting plate 9 is provided with an upper pin hole 16 and a lower pin hole 17. The upper pin hole 16 is suitable for the connecting pin shaft 12 to pass through; the lower pin hole 17 is located at the bottom of the upper pin hole 16 and is suitable for the pin shaft 11 to pass through; the diameter of the upper pin hole 16 is larger than the diameter of the lower pin hole 17, and the top horizontal length of the connecting plate 9 is adapted to the horizontal spacing of the mounting groove 15. The connecting plate 9 is crank-shaped, and the connecting plate outside the upper pin hole 16 is arranged in an arc shape and is adapted to slide vertically downward in the mounting groove 15. Pin shaft 1 and pin shaft 2 are provided to prevent dead points from being generated during downward output, such as the bottom pin shaft of the connecting plate abutting against the arc-shaped inner wall of the curved portion and being unable to move.

[0072] like Figure 3As shown, a limiting cylinder 18, a baffle 19 and a second retaining ring 20 are installed on the connecting pin shaft 12, and the limiting cylinder 18 is fixedly installed on the side of the connecting pin shaft 12 opposite to the knife pressing mother knife 1; a baffle 19 is installed on the end of the limiting cylinder 18 away from the connecting pin shaft 12; a positioning ring groove 21 is opened on the limiting cylinder 18; the limiting cylinder 18 is suitable for passing through the upper pin hole 16 and being limited in the upper pin hole 16 by installing the second retaining ring 20, and the outer diameter of the limiting cylinder 18 is adapted to the inner diameter of the upper pin hole 16; the bottom of the load-bearing spring 10 is connected to the connecting pin shaft 12.

[0073] like Figure 5 As described, the press knife side knife 2 includes a bottom knife portion 27 and a column portion 28, and the column portion 28 is provided with a position hole 29, a weight reduction hole 30 and a fixing hole 7 from top to bottom; the position hole 29 is suitable for the pin shaft 11 to pass through, and the fixing hole 7, the weight reduction hole 30 and the position hole 29 are distributed in a triangular shape; an arc-shaped notch is provided at the top of the column portion 28, and is suitable for the bottom connection of the connecting plate 9, and the position hole 29 is installed in the arc-shaped notch.

[0074] like Figure 7 As shown, the cover plate 4 is provided with a positioning hole 1 22 and a waist-shaped hole 23, and the side of the press knife 1 opposite to the cover plate 4 is provided with a positioning hole 24, the positioning hole 1 22 and the positioning hole 24 are adapted to each other, and the positioning hole 1 22 and the positioning hole 24 are suitable for installing a fixing screw 25 to connect;

[0075] like Figure 1 As shown, the end of the connecting pin 12 away from the knife pressing mother knife 1 is suitable for passing through the waist-shaped hole 23 and extending to the outer end of the cover plate 4; a closing portion 26 is provided on the top of the cover plate 4, and the closing portion 26 is suitable for closing the installation groove 13.

[0076] A pull rod type working method of a flexible bending center hinge knife device comprises the following steps:

[0077] Step 1: Installation and positioning

[0078] A plurality of pressing dies 31 are installed on the workbench of the flexible bending center 40. The pressing dies 31 include a plurality of pressing knives. Flexible bending center hinge knife devices are symmetrically installed on both sides of the pressing dies 31.

[0079] The bottom end of the press knife side knife 2 is horizontal in the initial position, and the working state of the press knife side knife 2 is that the bottom end rotates toward the middle of the pressing die 31;

[0080] Step 2: A mounting opening 32 is provided on the top of the pressing knife 1, and the mounting opening 32 is mounted corresponding to the mounting assembly to form a pressing die 31;

[0081] Step 3, a. First install the connecting pin 12, pass the limiting cylinder 18 on the connecting pin 12 through the connecting plate 9 and fix it in the positioning ring groove 21 with a retaining ring 20, and limit the limiting cylinder 18 on the connecting plate 9;

[0082] b. A pin 8 and a pin 2 11 are installed on the knife press side knife 2, the end of the pin 8 is in the curved groove, the pin 2 11 passes through the position hole 29 and is installed in the curved groove, and a retaining ring 33 is installed on the pin 8 and the pin 2 11, and the retaining ring 33 is located outside the curved groove;

[0083] c. Install the load-bearing spring 10. Hooks are provided at both the upper and lower ends of the load-bearing spring 10. The bottom hook of the load-bearing spring 10 is connected to the connecting pin 12. An upper bolt 14 is installed in a connecting hole 1 in the installation groove 13. The hook at the upper end of the load-bearing spring 10 is connected to the upper bolt 14. The inner diameter of the top hook is smaller than the outer diameter of the head of the upper bolt 14.

[0084] d. Install the cover plate 4 to shield the stepped surface 3 and the mounting groove 13; and install the fixing screw 25 in the positioning hole 22 to connect the closing cover plate 4 and the knife pressing mother knife 1;

[0085] Step 4, installing the pull rod pusher, after the workpiece is flanging at the flexible bending center 40;

[0086] When the press knife side knife 2 needs to be rotated, the pull rod pusher outputs downward, pushing the connecting pin shaft 12 extending from the waist-shaped hole 23 to descend along the waist-shaped hole 23, driving the pin shaft 1 8 and the pin shaft 2 11 on the press knife side knife 2 to move along the curved groove. When the connecting pin shaft 12 is located at the bottom of the waist-shaped hole 23, the bottom knife part 27 of the press knife side knife 2 reaches the limit position of rotation; the pull rod pusher stops outputting and maintains the state;

[0087] Complete workpiece unloading;

[0088] Step 5: Complete the reset:

[0089] When the pressing knife side knife 2 is not in use for rotation, the pull rod pushes the member upward, disengaging the connecting pin 12 extending out of the waist-shaped hole 23. Under the elastic restoring force of the supporting spring 10, the connecting pin 12 drives the pin 1 8 and the pin 2 11 to move in the opposite direction, thereby realizing the reverse rotation of the pressing knife side knife 2.

[0090] Example 2

[0091] like Fig.10 and 11 As shown, another embodiment of the present invention is based on Example 1. Fig.11As shown, the pull rod pusher includes a mounting plate 34, one end of which is mounted a stepper motor 35, and the output end of the stepper motor 35 is mounted with a driving gear 36, and a sliding rack 37 is mounted on the mounting plate 34, and the driving gear 36 is meshed and connected with the sliding rack 37; a pull rod 38 is mounted at the bottom of the sliding rack 37, and a bayonet portion is provided at the bottom of the pull rod 38, and is suitable for being movably connected with the connecting pin 12. A plurality of groups of pressing knives are provided in the middle of the pressing die, which are used to fix the workpiece, and a folding die whose bottom can move upward in the flexible bending is used to bend the edge line of the workpiece. In this embodiment, a stepper motor is used to drive the driving gear and the sliding rack to mesh and drive the sliding rack to move up and down, so that the pull rod 38 at the bottom can movably abut against the connecting pin, so as to drive the connecting plate to move downward, and drive the pins 1 and 2 to move along the curved groove, thereby realizing the bending of the pressing knife side knife 2.

[0092] A transverse guide rail 39 is mounted on the flexible bending center 40, and the mounting plate 34 is mounted in the transverse guide rail 39 and is suitable for sliding in the transverse guide rail 39; a transmission chain 41 is also mounted on the mounting plate 34, one end of the transmission chain 41 is fixedly connected to the mounting plate 34, and the other end is connected to the flexible bending center 40. If the pressing die can be changed in diameter, it can slide on the transverse guide rail through the mounting plate, and the transmission strength and wiring safety are maintained by the transmission chain.

[0093] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0094] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A flexible bending center hinge knife device, comprising a pressing die (31), characterized in that: Hinge knives are installed at both ends of the pressing die (31); the hinge knives include a pressing knife mother knife (1) and a pressing knife side knife (2); one side of the pressing knife mother knife (1) is provided with a stepped surface (3), and a curved groove is provided on the stepped surface (3); A cover plate (4) is detachably mounted on the stepped surface (3); The curved groove includes a straight portion (5) and a curved portion (6), and the curved portion (6) is arranged toward the middle of the pressing die (31); A fixing hole (7) is provided in the press knife side knife (2), and a pin shaft (8) is installed in the fixing hole (7). The pin shaft (8) is suitable for passing through the fixing hole (7) and sliding along the curved groove to drive the press knife side knife (2) to move and rotate; A connecting plate (9) and a bearing spring (10) are installed on the upper part of the knife-pressing side knife (2); a second pin shaft (11) is installed at the bottom of the connecting plate (9) and is connected to the knife-pressing side knife (2) via the second pin shaft (11); a connecting pin shaft (12) is installed at the top of the connecting plate (9), and the connecting pin shaft (12) is connected to the bottom end of the bearing spring (10).

2. The flexible bending center hinge knife device according to claim 1, characterized in that: The knife pressing mother knife (1) at the top of the stepped surface (3) is provided with a mounting groove (13), and the mounting groove (13) is connected to the stepped surface (3); A connecting hole (1) is provided in the installation groove (13), an upper bolt (14) is installed in the connecting hole, and the upper bolt (14) is fixed in the connecting hole; the top of the load-bearing spring (10) is connected to the upper bolt (14).

3. The flexible bending center hinge knife device according to claim 2, characterized in that: The stepped surface (3) is provided with a second mounting groove (15), the second mounting groove (15) being U-shaped, and the second mounting groove (15) is suitable for mounting a connecting plate (9), and the connecting plate (9) moves vertically along the second mounting groove (15); the first mounting groove (13) and the second mounting groove (15) are both opened and arranged vertically downward.

4. The flexible bending center hinge knife device according to claim 3, characterized in that: The connecting plate (9) is provided with an upper pin hole (16) and a lower pin hole (17), wherein the upper pin hole (16) is suitable for the connecting pin shaft (12) to pass through; the lower pin hole (17) is located at the bottom of the upper pin hole (16) and is suitable for the second pin shaft (11) to pass through; The diameter of the upper pin hole (16) is greater than the diameter of the lower pin hole (17), and the horizontal length of the top of the connecting plate (9) is matched with the horizontal spacing of the second mounting groove (15).

5. The flexible bending center hinge knife device according to claim 4, characterized in that: The connecting pin shaft (12) is provided with a limiting cylinder (18), a baffle plate (19) and a second baffle ring (20); the limiting cylinder (18) is fixedly installed on a side of the connecting pin shaft (12) opposite to the knife pressing mother knife (1); the baffle plate (19) is installed on one end of the limiting cylinder (18) away from the connecting pin shaft (12); The limiting cylinder (18) is provided with a positioning ring groove (21); the limiting cylinder (18) is suitable for passing through the upper pin hole (16) and being restricted in the upper pin hole (16) by installing a second retaining ring (20); the outer diameter of the limiting cylinder (18) is adapted to the inner diameter of the upper pin hole (16); The bottom of the load-bearing spring (10) is connected to a connecting pin (12).

6. The flexible bending center hinge knife device according to claim 5, characterized in that: The cover plate (4) is provided with a first positioning hole (22) and a waist-shaped hole (23); the knife press (1) is provided with a second positioning hole (24) on a side opposite to the cover plate (4); the first positioning hole (22) and the second positioning hole (24) are adapted to each other; and a fixing screw (25) is installed between the first positioning hole (22) and the second positioning hole (24) to connect them; The end of the connecting pin (12) away from the knife pressing mother knife (1) is suitable for passing through the waist-shaped hole (23) and extending to the outer end of the cover plate (4); A closing portion (26) is provided on the top of the cover plate (4), and the closing portion (26) is suitable for closing the first installation groove (13).

7. The flexible bending center hinge knife device according to claim 5, characterized in that: The knife-pressing side knife (2) comprises a bottom knife portion (27) and a column portion (28), wherein the column portion (28) is provided with a position hole (29), a weight-reducing hole (30) and a fixing hole (7) from top to bottom; the position hole (29) is suitable for the second pin (11) to pass through, and the fixing hole (7), the weight-reducing hole (30) and the position hole (29) are distributed in a triangular shape; The top of the column part (28) is provided with an arc-shaped notch and is suitable for connecting to the bottom of the connecting plate (9), and the position hole (29) is installed in the arc-shaped notch.

8. A pull rod type working method of the flexible bending center hinge knife device as claimed in claim 7, characterized in that: The following steps are involved: Step 1: Installation and positioning A plurality of pressing dies (31) are installed on the workbench of the flexible bending center (40), the pressing dies (31) include a plurality of pressing knives, and the flexible bending center hinge knife device according to claim 7 is symmetrically installed on both sides of the pressing dies (31); The bottom end of the pressing knife side knife (2) is horizontal at the initial position, and the working state of the pressing knife side knife (2) is that the bottom end rotates toward the middle of the pressing die (31); Step 2, a mounting opening (32) is provided on the top of the pressing knife (1), and the mounting opening (32) is mounted corresponding to the mounting assembly to form a pressing die (31); Step 3: Installation of hinge knife device a. First install the connecting pin (12), pass the limiting cylinder (18) on the connecting pin (12) through the connecting plate (9) and fix it in the positioning ring groove (21) with the second retaining ring (20), and limit the limiting cylinder (18) on the connecting plate (9); b. A pin shaft 1 (8) and a pin shaft 2 (11) are installed on the knife pressing side knife (2), the end of the pin shaft 1 (8) is in the curved groove, the pin shaft 2 (11) passes through the position hole (29) and is installed in the curved groove, and a retaining ring 1 (33) is installed on both the pin shaft 1 (8) and the pin shaft 2 (11), and the retaining ring 1 (33) is located outside the curved groove; c. Install the load-bearing spring (10), the upper and lower ends of the load-bearing spring (10) are provided with hooks, so that the bottom hook of the load-bearing spring (10) is connected to the connecting pin (12); install the upper bolt (14) in the connecting hole 1 in the installation groove 1 (13), the hook at the upper end of the load-bearing spring (10) is connected to the upper bolt (14), and the inner diameter of the top hook is smaller than the outer diameter of the head of the upper bolt (14); d. Install the cover plate (4) to cover the stepped surface (3) and the mounting groove (13); and install the fixing screw (25) in the positioning hole (22) to connect the closing cover plate (4) and the knife pressing mother knife (1); Step 4, installing the pull rod pusher, after the workpiece is flanged at the flexible bending center (40); When the knife pressing side knife (2) needs to be rotated, the pull rod pusher is output downward, pushing the connecting pin shaft (12) extending out of the waist-shaped hole (23) to descend along the waist-shaped hole (23), driving the pin shaft 1 (8) and the pin shaft 2 (11) on the knife pressing side knife (2) to move along the curved groove, and when the connecting pin shaft (12) is located at the bottom of the waist-shaped hole (23), the bottom knife part (27) of the knife pressing side knife (2) reaches the limit position of rotation; the pull rod pusher stops outputting and maintains the state; Complete workpiece unloading; Step 5: Complete the reset: When the knife pressing side knife (2) is not in use for rotation, the pull rod pushes the member upwards and disengages from the connecting pin (12) extending out of the waist-shaped hole (23). Under the action of the elastic restoring force of the bearing spring (10), the connecting pin (12) drives the pin one (8) and the pin two (11) upwards to move in the opposite direction, thereby realizing the reverse rotation of the knife pressing side knife (2).

9. The working method of the flexible bending center hinge knife device according to claim 8, characterized in that: The pull rod pusher comprises a mounting plate (34), a stepper motor (35) is mounted on one end of the mounting plate (34), a driving gear (36) is mounted on the output end of the stepper motor (35), a sliding rack (37) is mounted on the mounting plate (34), and the driving gear (36) is meshedly connected with the sliding rack (37); A pull rod (38) is installed at the bottom of the sliding rack (37). A bayonet portion is provided at the bottom of the pull rod (38) and is suitable for being movably connected to the connecting pin shaft (12).

10. The working method of the flexible bending center hinge blade device according to claim 8, characterized in that: A transverse guide rail (39) is installed on the flexible bending center (40), and the mounting plate (34) is installed in the transverse guide rail (39) and is suitable for sliding in the transverse guide rail (39); a transmission chain (41) is also installed on the mounting plate (34), one end of the transmission chain (41) is fixedly connected to the mounting plate (34), and the other end is connected to the flexible bending center (40).

Images