A deflection self-adaptive compensation device and a bending machine comprising the same

Abstract

The application discloses a deflection self-adaptive compensation device and a bending machine comprising the same, which comprises a compensation device base body, a lower die mechanism and a deflection compensation mechanism; the lower die mechanism is placed on the compensation device base body; the deflection compensation mechanism is adapted to the length of the lower die mechanism, and the deflection compensation mechanism has a top pressing component capable of being lifted upward; the top pressing component can be self-adaptively adjusted in the length direction to adjust the lifting height, so that the lower die mechanism has uniform top pressing force on the workpiece along the bending length direction. The deflection self-adaptive compensation device and the bending machine comprising the same have the advantages that the deflection compensation mechanism can be self-adaptively adjusted according to the specific non-uniform situation of the stretching and offset of the lower die mechanism in the length direction, and the surface camber curve can be adjusted; under different machining conditions of bending materials, plate thicknesses, shapes, bending dies and the like, the lower die mechanism can ensure that the lower die has uniform and consistent top pressing force on the bending part along the bending length direction, so that perfect deflection compensation effect is obtained, and different deflection compensation mechanisms do not need to be designed for different machine tool specifications, and the cost of the deflection compensation mechanism is reduced.

Description

Technical Field

[0001] This invention relates to the field of bending machine design technology, and more particularly to a deflection adaptive compensation device and a bending machine including the same. Background Technology

[0002] In existing technologies, there are two methods to compensate for the deflection problem generated during sheet metal bending. One is hydraulic, which involves setting the machine tool compensation device base as three vertically parallel plates, with 3-5 hydraulic cylinders (the cylinders sit on the front and rear plates, and the piston rods act on the middle plate) in the middle. The hydraulic control cylinders apply force to the middle plate on which the lower bending die is installed, thereby forming a microscopic upward arch curve in the middle plate (i.e., making the lower die generate a uniform upward force) to achieve deflection compensation. The other is mechanical, which involves installing a modular mechanical wave plate (with different inclinations between the middle and the two ends of the coupling moving wedge) on the vertical plate of the compensation device base. An upward arch curve (surface) is formed by a pre-set tension displacement based on experience. During bending, the force pressing the sheet metal drives the bottom surface of the lower die to fit against this upward arch curve (surface), thereby making the lower die generate a uniform upward force to a certain extent.

[0003] The first type, hydraulic cylinder compensation, can achieve a relatively perfect deflection compensation effect for different bending machine specifications and sheet material thickness differences. However, it requires the installation and configuration of a hydraulic control system and cylinders in the machine tool, resulting in high overall machine cost and maintenance cost, as well as low stability due to issues such as oil leakage. The second type, mechanical wave plate, can be easily modularized and can be conveniently added and configured for both new and old machine tools. However, since the slope of the moving wedge block corresponding to its specific position is fixed, and the upward arch curve generated by different tensile displacements is also fixed, it cannot flexibly meet the needs of the non-precisely predictable upward arch deflection curves generated by different machine tool specifications and material thickness differences. Summary of the Invention

[0004] To address the technical problems of high equipment cost or limited compensation targets in existing bending machine deflection compensation mechanisms, which cannot adaptively adjust the compensation size according to the upward arch curve generated by different tensile displacements, this invention provides a deflection adaptive compensation device and a bending machine containing the device to solve the above problems.

[0005] This invention proposes a deflection adaptive compensation device, comprising a compensation device base, a lower die mechanism, and a deflection compensation mechanism; the lower die mechanism is placed on the compensation device base; the length of the deflection compensation mechanism is adapted to the length of the lower die mechanism, and the deflection compensation mechanism has a pressing component capable of upward lifting, the pressing component being adaptively adjustable in height along the bending length direction, so that the lower die mechanism exerts a uniform pressing force on the workpiece along the bending length direction.

[0006] Furthermore, the deflection compensation mechanism includes a pressure region defined in the bending length direction, the pressure assembly being located within the pressure region, applying a total driving force to the pressure region and distributing the total driving force to the pressure assembly along the bending length direction.

[0007] Furthermore, the top of the compensation device base has a groove, and the lower mold mechanism is located on the groove. The compensation device base and the lower mold mechanism form a cavity with variable volume to accommodate the deflection compensation mechanism.

[0008] Furthermore, the deflection compensation mechanism includes a partition and a driving member fixed to the base of the compensation device. The driving member drives the partition to reciprocate along the bending length direction. The partition divides the receiving cavity into a rod-type cavity and a rodless cavity that are not interconnected. The top pressure component is a fluid filled in the rodless cavity.

[0009] Furthermore, the lower mold mechanism is connected to the base of the compensation device via a stud, and a return spring is provided between the nut of the stud and the end face of the compensation device base.

[0010] Furthermore, the fluid is a non-liquid fluid.

[0011] Furthermore, the top-pressing assembly consists of several first movable pulleys arranged along the bending length direction, and the deflection compensation mechanism further includes a drive wheel, a fixed wheel, and several first fixed pulleys arranged along the bending length direction. The first fixed pulleys, the fixed wheel, and the drive wheel are connected to the compensation device base, and the first movable pulleys are movably disposed within the compensation device base. One end of the steel belt is wound around the drive wheel, and the other end of the steel belt alternately passes through the first movable pulleys and the first fixed pulleys, and is finally fixed to the fixed wheel. The lower surface of the lower mold mechanism is deformed up and down by the first movable pulleys.

[0012] Furthermore, the central axis of the first movable pulley is perpendicular to the direction of movement of the lower mold mechanism, the first movable pulley is rotatably connected to the lower mold mechanism, and the height of the first fixed pulley is higher than the height of the first movable pulley.

[0013] Furthermore, there are two of each of the first fixed pulley and the first movable pulley, and two fixed wheels. One end of each steel belt is wrapped around the two ends of the drive wheel, and the other end of the steel belt alternately passes through the first movable pulley and the first fixed pulley along the corresponding axial length, and finally connects to the two fixed wheels. The ends of the steel belts on the two fixed wheels are joined together, so that the two steel belts are connected to form a single steel belt.

[0014] Furthermore, the top-pressing assembly also includes a plurality of second movable pulleys arranged along the bending length direction, and the deflection compensation mechanism also includes a transfer fixed pulley and a plurality of second fixed pulleys arranged along the bending length direction. The transfer fixed pulley and the second fixed pulleys are connected to the compensation device base. The second movable pulleys are slidably mounted on the compensation device base and rotatably connected to the lower mold mechanism. The height of the second fixed pulleys is higher than the height of the second movable pulleys. One end of the steel belt is wound around the drive wheel, and the other end of the steel belt alternately passes through the first movable pulley and the first fixed pulley from one end to the other in the bending length direction, then is transferred by the transfer fixed pulley, and then alternately passes through the second fixed pulley and the second movable pulley from the other end to one end in the bending length direction, and is finally fixed on the fixed wheel.

[0015] Furthermore, the outer diameters of the second movable pulley and the first fixed pulley are larger than the outer diameters of the first movable pulley and the second fixed pulley. The second movable pulley is located below the first fixed pulley, and the second fixed pulley and the first movable pulley are arranged alternately between the second movable pulley and the first fixed pulley along the bending length direction.

[0016] Furthermore, the central axes of the first fixed pulley and the first movable pulley are parallel to the direction of movement of the lower mold mechanism. A number of movable wedges are provided in the receiving cavity, and a first movable pulley is installed in each movable wedge. The contact surface between the lower surface of the movable wedge and the receiving cavity is an inclined surface, which gradually slopes downward from the end near the first fixed pulley to the end away from the first fixed pulley.

[0017] Furthermore, the central axes of the first fixed pulley and the first movable pulley are parallel to the direction of movement of the lower mold mechanism. The rotating shaft on which the first movable pulley is fitted is rotatably connected to the base of the compensation device and has a radial protrusion. The first movable pulley and the radial protrusion have a conical contact surface. When the first movable pulley is offset, the rotating shaft of the first movable pulley moves relative to the first movable pulley along the conical contact surface, so that the rotating shaft of the first movable pulley has an axial offset at the same time. The lower mold mechanism is lifted by the axial offset of the rotating shaft of the first movable pulley.

[0018] The present invention also proposes a bending machine, including the deflection adaptive compensation device described above.

[0019] The beneficial effects of this invention are:

[0020] (1) The deflection adaptive compensation device and bending machine containing the present invention can adaptively adjust the upper arch curve of the surface according to the specific unevenness of the stretching offset of the lower die mechanism in the bending length direction. It does not require designing different deflection compensation mechanisms for different machine tool specifications, thereby reducing the design cost of the deflection compensation mechanism and thus reducing the production cost of the production line.

[0021] (2) In this invention, the deflection compensation mechanism applies a fixed total driving force within a defined top pressure area. The driving force can be automatically distributed within the top pressure area according to the different stretching offset conditions. The entire deflection compensation mechanism only needs to provide one total driving force, which greatly reduces the number of driving devices. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a front view of the deflection adaptive compensation device described in Embodiments 1 and 2 of the present invention;

[0024] Figure 2 yes Figure 1 Sectional view along axis AA;

[0025] Figure 3 yes Figure 1 BB-direction sectional view;

[0026] Figure 4 This is a perspective view (internal structure visible) of the deflection adaptive compensation device corresponding to the first structure in Embodiment 3 of the present invention;

[0027] Figure 5 yes Figure 4 Enlarged view of point a in the middle;

[0028] Figure 6 yes Figure 4 Enlarged view at point b;

[0029] Figure 7 yes Figure 4 A cross-sectional view of the fixed pulley section in the deflection adaptive compensation device shown;

[0030] Figure 8 yes Figure 4 The cross-sectional view of the uncompensated state at the cross-sectional position of the movable pulley in the deflection adaptive compensation device shown;

[0031] Figure 9 yes Figure 4 A cross-sectional view of the deflection compensation state at the cross-section where the movable pulley is located in the deflection adaptive compensation device shown.

[0032] Figure 10 This is a schematic diagram of the internal structure of the deflection adaptive compensation device corresponding to the second structure in Embodiment 3 of the present invention;

[0033] Figure 11 yes Figure 10 The cross-sectional view of the uncompensated state at the cross-sectional position of the first movable pulley in the deflection adaptive compensation device shown;

[0034] Figure 12 yes Figure 10 The deflection compensation state cross-sectional view of the first movable pulley in the deflection adaptive compensation device shown;

[0035] Figure 13 This is a cross-sectional view of the uncompensated state of the first movable pulley at the cross-sectional position under the deflection adaptive compensation device corresponding to the third structure in Embodiment 3 of the present invention.

[0036] Figure 14 This is a cross-sectional view of the deflection compensation state at the cross-sectional position of the first movable pulley under the deflection adaptive compensation device corresponding to the third structure in Embodiment 3 of the present invention.

[0037] In the diagram, 1. Compensation device base, 2. Lower mold mechanism, 3. Receiving cavity, 4. Partition plate, 5. Driving component, 6. Stud, 7. Return spring, 8. Driving wheel, 9. Fixed wheel, 10. First fixed pulley, 11. First movable pulley, 12. Steel belt, 13. Tie rod, 14. Adapter fixed pulley, 15. Second fixed pulley, 16. Second movable pulley, 17. Movable wedge, 18. Inclined surface, 20. Conical contact surface, 21. Rotating shaft, 22. Radial protrusion, 23. Connecting plate, 24. Workpiece, 25. Fluid, 26. Fixed wedge. Detailed Implementation

[0038] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0039] A deflection adaptive compensation device includes a compensation device base 1, a lower die mechanism 2, and a deflection compensation mechanism; the lower die mechanism 2 is placed on the compensation device base 1; the length of the deflection compensation mechanism is adapted to the length of the lower die mechanism 2, and the deflection compensation mechanism has a pressing component that can lift upwards, and the pressing component can adaptively adjust the lifting height along the bending length direction so that the lower die mechanism 2 exerts a uniform pressing force on the workpiece 24 along the bending length direction.

[0040] The lower die mechanism 2 is used to place the workpiece 24, and its length is not less than the length of the workpiece 24. The lower die mechanism 2 typically includes a lower die mounting base and a lower die. The lower die is located on top of the lower die mounting base, and the workpiece 24 is placed on the top surface of the lower die. The pressing assembly enables the lower die mounting base to support the lower die and exert a uniform pressing force on the workpiece 24 along the bending length direction. The pressing assembly is in direct contact with the lower surface of the lower die mounting base. The lower die mounting base is the one that deforms under the action of the pressing assembly. The deflection compensation mechanism is used to adjust the upward arching amplitude of the upper surface of the pressing assembly within the force range of the workpiece 24, and the upward arching amplitude can adaptively adapt in the bending length direction. In order to ensure that the upper surface of the lower die mechanism 2 remains in contact with the workpiece 24 when bending the workpiece 24, the lower surface of the lower die mounting base in the lower die mechanism 2 will form a deflection curve due to tensile displacement. Different machine tool specifications and different material thicknesses of the lower die mechanism 2 will produce different deflection curves. The adaptive adjustment means that the top pressure component can form a corresponding lifting height according to the different deflection curves of the lower die mechanism 2, so that the top pressure component and the lower die mechanism 2 are completely in contact. At this time, the top pressure component can apply appropriate top pressure to the lower die mechanism 2, and the upper surface of the lower die mechanism 2 will not be uneven due to excessive or insufficient pressure.

[0041] Specifically, the deflection compensation mechanism includes a pressure region defined in the bending length direction. A pressure assembly is located within this pressure region. A total driving force is applied to the pressure region and distributed along the bending length direction to the pressure assembly. The pressure region spatially confines the total driving force, ensuring it can only be distributed within this region. Under the same operating conditions, the total driving force injected into the pressure region is the same; however, for different operating conditions, the total driving force can still vary relatively, thereby allowing the surface of the pressure assembly to form the desired upward arch curve within the pressure region.

[0042] like Figure 2 As shown, the top of the compensation device base 1 has a groove, and the lower mold mechanism 2 is located on the groove. The compensation device base 1 and the lower mold mechanism 2 form a cavity 3 that accommodates the deflection compensation mechanism and has a variable volume. The variable volume of the cavity 3 means that the volume of the cavity changes when the lower surface of the lower mold mechanism 2 deforms.

[0043] This invention cleverly integrates and utilizes the advantages of existing hydraulic and mechanical compensation technologies while eliminating their disadvantages. This results in a system that can achieve the desired upward arch curve required for actual bending processes, thus obtaining an ideal deflection compensation effect. It also provides a low-cost, modular compensation system that is easy to install on new and old bending machines and is convenient for maintenance.

[0044] The deflection compensation mechanism can specifically adopt the following solutions:

[0045] Example 1

[0046] like Figures 1-3 As shown, the deflection compensation mechanism includes a partition 4 and a driving component 5 fixed on the base 1 of the compensation device. The driving component 5 drives the partition 4 to reciprocate along the bending length direction. The partition 4 divides the receiving cavity 3 into a rod-type cavity and a rodless cavity that are not interconnected. The top pressure component is a fluid 25 filled in the rodless cavity.

[0047] The driving component 5 can be a hydraulic cylinder, a telescopic motor, or a servo electric cylinder. The top-pressing area is the rodless cavity. The fluid 25 in the rodless cavity is in direct contact with the lower mold mechanism 2, applying top pressure to the lower mold mechanism 2. The driving component 5 provides the total driving force. The total driving force changes the volume of the rodless cavity by pushing and pulling the partition 4, thereby adapting to different plate thicknesses and adjusting the height of the fluid 25 in the rodless cavity. After the position of the partition 4 is fixed, the volume of the rodless cavity is fixed. The fluid 25 is distributed in the rodless cavity according to the tensile deformation of the lower mold mechanism 2. Some length sections sink to form a concave surface, and some length sections are lifted to form a convex surface. The entire length section forms an upward arched deflection curve that fits the surface of the lower mold mechanism 2.

[0048] When deflection compensation is required, the push rod head of the drive component 5 pushes the fluid 25 into the receiving cavity 3 through the partition 4, so that the lower surface of the lower mold mechanism 2 receives a uniform and the same upward lifting force, thereby achieving the ideal deflection compensation effect.

[0049] To prevent fluid 25 from leaking out, the rodless cavity needs to be sealed from the outside and other cavities. To reduce the sealing requirements, the fluid 25 is preferably a non-liquid fluid.

[0050] Example 2

[0051] Based on Embodiment 1, the lower mold mechanism 2 is connected to the compensation device base 1 via a stud 6. A return spring 7 is provided between the nut of the stud 6 and the end face of the compensation device base 1, such as... Figure 2 As shown, multiple studs 6 are arranged along the bending length direction. Under normal conditions, the return spring 7 is in a stretched state, pressing the lower die mechanism 2 against the surface of the compensation device base 1. When the surface of the lower die mechanism 2 connected to the studs 6 is lifted, the return spring 7 is stretched further. Conversely, when the surface of the lower die mechanism 2 connected to the studs 6 is recessed downwards, the return spring 7 can reverse and reset. When it is necessary to switch between different workpiece 24 thicknesses and lower the height of the lower die mechanism 2, the push rod head of the drive component 5 retracts, the volume in the rodless cavity increases, and the return spring 7 can pull the lower die mechanism 2 down rapidly.

[0052] Example 3

[0053] In this embodiment, the deflection compensation mechanism, in addition to the pressing assembly, also includes a drive wheel 8, a fixed wheel 9, and a plurality of first fixed pulleys 10 arranged along the bending length direction. The pressing assembly consists of a plurality of first movable pulleys 11 arranged along the bending length direction. The first fixed pulleys 10, the fixed wheel 9, and the drive wheel 8 are connected to the compensation device base 1, and the first movable pulleys 11 are movably disposed within the compensation device base 1. One end of the steel belt 12 is wound around the drive wheel 8, and the other end of the steel belt 12 alternately passes through the first movable pulleys 11 and the first fixed pulleys 10, and is finally fixed to the fixed wheel 9. The lower surface of the lower mold mechanism 2 is deformed up and down by the first movable pulleys 11. The number of first movable pulleys 11 and second movable pulleys 16 should be the same.

[0054] In this embodiment, the drive wheel 8 serves as one end fixing point of the steel belt 12, and the fixed wheel 9 serves as the other end fixing point of the steel belt 12. The drive wheel 8 and the fixed wheel 9 can be set at both ends in the bending length direction. The steel belt 12 is fixed on the fixed wheel 9 and can be wound and tightened or released on the drive wheel 8. The force applied by the drive wheel 8 to the steel belt 12 is the total driving force of the deflection compensation mechanism on the top pressing component. The first movable pulley 11 and the second movable pulley 16 are both located in the receiving cavity 3 formed by the compensation device base 1 and the lower mold mechanism 2. When the drive wheel 8 stops rotating, the length of the steel belt 12 is fixed, and the total driving force is fixed. The total driving force is only distributed among all the first movable pulleys 11, that is, it is limited to the top pressing area where the first movable pulleys 11 are located.

[0055] When the drive wheel 8 retracts around the steel belt 12, it drives the first moving pulley 11 to rise. All the first moving pulleys 11 are connected in series. When the length of the steel belt 12 is constant, the lifting height of the first moving pulley 11 at different positions is also different when the pressure at different positions is different. This causes the upper surface of the top pressing component to form an upward arch deflection curve, so that the lower mold mechanism 2 can obtain a uniform upward pressing force and also obtain an ideal deflection compensation effect. At the same time, the length of the steel belt 12 released can be adjusted according to different machine tool specifications or workpiece 24 thickness (i.e., the total driving force can be adjusted).

[0056] In this embodiment, the specific structure of the first movable pulley 11 pressing against the lower mold mechanism 2 can adopt the following three methods:

[0057] First structure:

[0058] The central axis of the first movable pulley 11 is perpendicular to the direction of movement of the lower mold mechanism 2, and the first movable pulley 11 is rotatably connected to the lower mold mechanism 2. The lower mold mechanism 2 moves vertically, while the central axis of the first movable pulley 11 is arranged in the front-back direction (the front-back direction refers to the width direction of the compensation device base 1). Figure 8As shown, the first movable pulley 11 is rotatably connected to the lower mold mechanism 2 via a tie rod 13. The first movable pulley 11 is located inside the compensation device base 1, and preferably slides with the compensation device base 1 to ensure that the first movable pulley 11 only moves in the vertical direction. When no deflection compensation is performed, the first movable pulley 11 is in a position where... Figure 8 The first fixed pulley 10 is in the position shown. Figure 7 As shown, after the tightened steel belt 12 enters the deflection compensation state, the position of the first fixed pulley 10 remains unchanged (still in the position shown). Figure 7 (As shown in the image), the first movable pulley 11 is pulled upwards, as... Figure 9 As shown, the distance between the first movable pulley 11 and the bottom surface of the receiving cavity 3 increases, and the first movable pulley 11 lifts the lower mold mechanism 2 through the pull rod 13. Since the first fixed pulley 10 needs to lift the first movable pulley 11 upward, the first fixed pulley 10 is located above the first movable pulley 11.

[0059] In this structure, both the movable and fixed pulleys can be arranged in a single row, with the fixed wheel 9 and the drive wheel 8 positioned at both ends along the bending length. Each first movable pulley 11 and each first fixed pulley 10 is mounted on its respective shaft. Each shaft can have either one first movable pulley 11 or one first fixed pulley 10 mounted on it. In another optional embodiment, two first fixed pulleys 10 and two first movable pulleys 11 are coaxially arranged, such as... Figure 4 , Figure 7 and Figure 8 As shown, the workpiece 24 is placed at the center of the top width of the lower mold mechanism 2. Two sets of first fixed pulleys 10 and first movable pulleys 11 are symmetrically distributed on both sides. This reduces the width of individual pulleys while improving the overall structural strength. With the increased number of first fixed pulleys 10 and first movable pulleys 11, two fixed wheels 9 are also provided. One end of each steel belt 12 is wrapped around both ends of the drive wheel 8, and the other end of the steel belt 12 alternately passes through the first movable pulley 11 and the first fixed pulley 10 along the corresponding axial length, finally connecting to the two fixed wheels 9. The ends of the steel belts 12 on the two fixed wheels 9 are joined together, forming a single steel belt 12. The connection directions of the two steel belts 12 on the two fixed wheels 9 are opposite, as shown... Figure 5 As shown, the two steel belts 12 are joined at the two fixed wheels 9 and rotate in opposite directions, which can tighten the steel belts 12 on both sides. In addition, the two fixed wheels 9 can also adaptively adjust the length of the steel belts 12 of the two sets of first movable pulleys 11. That is, the shorter steel belt 12 will pull the longer steel belt 12, ensuring that the two sets of first movable pulleys 11 are subjected to uniform force.

[0060] Further design of the structure: Two rows of movable and fixed pulleys can be arranged. Specifically, the deflection compensation mechanism further includes a transition fixed pulley 14, several second fixed pulleys 15 and second movable pulleys 16 arranged along the bending length direction. The transition fixed pulley 14 and the second fixed pulleys 15 are connected to the compensation device base 1. The second movable pulleys 16 are slidably mounted on the compensation device base 1 and rotatably connected to the lower mold mechanism 2. The height of the second fixed pulleys 15 is higher than the height of the second movable pulleys 16. One end of the steel belt 12 is wound around the drive wheel 8, and the other end of the steel belt 12 alternately passes through the first movable pulley 11 and the first fixed pulley 10 from one end to the other along the bending length direction, then is transferred by the transition fixed pulley 14, and then alternately passes through the second movable pulleys 16 and the second fixed pulleys 15 from one end to the other along the bending length direction, finally being fixed to the fixed wheel 9. At this time, the fixed wheel 9 and the drive wheel 8 are located at the same end along the bending length direction.

[0061] Since the movable pulleys are all located below the corresponding fixed pulleys, the steel belt 12 passes over the first fixed pulley 10 and the second fixed pulley 15. It also passes under the first movable pulley 11 and the second movable pulley 16. To transfer the steel belt 12 from the first fixed pulley 10 to the second fixed pulley 15, a transition fixed pulley 14 needs to be installed after the last first fixed pulley 10. The steel belt 12 passes under the transition fixed pulley 14 and then over the second fixed pulley 15, as shown below. Figures 4-6 As shown, the steel belt 12 passes alternately through the first movable pulley 11 and the first fixed pulley 10 from right to left. After passing over the first fixed pulley 10 at the leftmost end, it passes under the transition fixed pulley 14 and then passes over the second fixed pulley 15 at the leftmost end. It then passes alternately through the second movable pulley 16 and the second fixed pulley 15 until it passes through the second movable pulley 16 at the rightmost end and connects with the fixed pulley 9.

[0062] To ensure a compact structure, the outer diameters of the second movable pulley 16 and the first fixed pulley 10 are larger than the outer diameters of the first movable pulley 11 and the second fixed pulley 15. The second movable pulley 16 is located below the first fixed pulley 10, and the second fixed pulley 15 and the first movable pulley 11 are arranged alternately between the second movable pulley 16 and the first fixed pulley 10 along the bending length direction.

[0063] The second structure:

[0064] The central axes of the first fixed pulley 10 and the first movable pulley 11 are parallel to the movement direction of the lower mold mechanism 2. A plurality of movable wedges 17 are provided in the receiving cavity 3. Each movable wedge 17 is equipped with a first movable pulley 11. The contact surface between the lower surface of the movable wedge 17 and the receiving cavity 3 is an inclined surface 18. The inclined surface 18 gradually slopes downward from the end near the first fixed pulley 10 to the end away from the first fixed pulley 10.

[0065] like Figures 10-12As shown, the lower mold mechanism 2 moves in the vertical direction. The central axes of the first fixed pulley 10 and the first movable pulley 11 are also arranged in the vertical direction. The movable wedge 17 contacts the lower mold mechanism 2. Several movable wedges 17 are arranged along the bending length direction. Several fixed wedges 26 are correspondingly arranged on the bottom surface of the receiving cavity 3. The fixed wedges 26 cooperate with the inclined surfaces of the movable wedges 17. The cooperation of the first movable pulley 11, the movable wedges 17, and the fixed wedges 26 drives the top of the movable wedges 17 to change its height vertically, forming an upward arched deflection surface that fits against the lower surface of the lower mold mechanism 2, thereby achieving a uniform upward force. The inclined surface 18 can be a single surface or multiple inclined surfaces 18, such as... Figure 11 As shown, the inclined plane 18 is provided with three sections, and adjacent inclined planes 18 are connected by a horizontal plane. When no deflection compensation is performed, the moving wedge block 17 and the fixed wedge block 26 are in a state of... Figure 11 As shown, when the drive wheel 8 retracts around the steel belt 12, the first movable pulley 11 is pulled closer to the first fixed pulley 10, that is, the first movable pulley 11 moves towards... Figure 11 The right side pushes the moving wedge 17, causing it to move to the right, thus shifting the inclined plane 18 relative to the fixed wedge 26 to the right. Simultaneously, the inclined plane 18 is lifted upwards, reaching its maximum position. Figure 12 The deflection compensation state is shown.

[0066] The third structure:

[0067] The central axis of the first fixed pulley 10 and the first movable pulley 11 is parallel to the direction of movement of the lower mold mechanism 2. Two first movable pulleys 11 are coaxially arranged. The rotating shaft 21 on which the first movable pulley 11 is sleeved is rotatably connected to the base 1 of the compensation device and has a radial protrusion 22. The first movable pulley 11 and the radial protrusion 22 have a conical contact surface 20. When the first movable pulley 11 is offset, the rotating shaft 21 of the first movable pulley 11 moves relative to the first movable pulley 11 along the conical contact surface 20, so that the rotating shaft 21 of the first movable pulley 11 has an axial offset at the same time, and the lower mold mechanism 2 is lifted by the axial offset of the rotating shaft 21.

[0068] like Figure 13 As shown, the outer circumferential surface of the shaft 21 of the first movable pulley 11 is changed from a conventional cylindrical surface to an irregular columnar structure with two radial protrusions 22. The lower surfaces of the two radial protrusions 22 are both conical contact surfaces 20. The shaft 21 of the first movable pulley 11 is rotatably engaged with the base 1 of the compensation device. The diameter of the internal cavity of the first movable pulley 11 is larger than the diameter of the shaft 21, and the shaft can move along the conical contact surface 20 of the inner wall. When no deflection compensation is performed, the shaft 21 is in a low position and abuts against the inner bottom surface of the receiving cavity 3. When the drive wheel 8 retracts around the steel belt 12, the first movable pulley 11 is pulled closer to the first fixed pulley 10, that is... Figure 13 The first movable pulley 11 needs to move to the right, thereby lifting the rotating shaft 21 upward under the action of the left side of the conical contact surface 20. Figure 14In the state shown, the end of the rotating shaft 21 pushes up the lower mold mounting seat 2, thereby achieving the effect of deflection compensation.

[0069] To facilitate assembly, a connecting plate 23 can be installed at the bottom and top of the first movable pulley 11. Both connecting plates 23 are provided with shaft holes that cooperate with the rotating shaft 21 and are always in cooperation with the two shaft holes to achieve rotational connection. The bottom connecting plate 23 is pressed and fixed, and the top connecting plate 23 is driven upward by the radial protrusion 22 of the rotating shaft 21. The connecting plate 23 lifts the lower mold mechanism 2, thereby achieving the effect of deflection compensation.

[0070] Example 4

[0071] A bending machine includes the aforementioned deflection adaptive compensation device.

[0072] In the description of this invention, it should be understood that the terms "center", "length", "width", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", "axial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0073] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Additionally, in the description of this invention, unless otherwise stated, "a number" means two or more.

[0074] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0075] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A deflection adaptive compensation device, characterized in that: This includes the compensation device base, the lower mold mechanism, and the deflection compensation mechanism; The lower die mechanism is placed on the base of the compensation device; the deflection compensation mechanism is adapted to the length of the lower die mechanism, and the deflection compensation mechanism has a pressing component that can lift upwards. The pressing component can adaptively adjust the lifting height along the bending length direction so that the lower die mechanism has a uniform pressing force on the workpiece along the bending length direction; the deflection compensation mechanism includes a pressing region with a defined size in the bending length direction, the pressing component is located in the pressing region, the deflection compensation mechanism applies a total driving force to the pressing region and distributes the total driving force along the length direction to the pressing component; the top of the compensation device base has a groove, the lower die mechanism is located on the groove, and the compensation device base and the lower die mechanism form a cavity with variable volume that accommodates the deflection compensation mechanism; the deflection compensation mechanism includes a partition and a driving member fixed to the compensation device base, the driving member drives the partition to reciprocate along the length direction, the partition divides the cavity into a rod-type cavity and a rodless cavity that are not interconnected, and the pressing component is fluid filled in the rodless cavity.

2. A bending machine, characterized in that: Includes the deflection adaptive compensation device as described in claim 1.

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