Curved Knife Angle Detection Device, Curved Knife Equipment and Angle Detection Method

Abstract

The present invention relates to a curved knife angle detection device, comprising: a fixture positioning block for positioning the straight segment of the blade to facilitate measuring the angle between the straight segment and the bent segment of the blade; a detection assembly, the head end of which is fixed on the rotating shaft of the motor and rotates with the rotating shaft, and after the detection assembly rotates, it can touch the wall surface of the bent segment; and a detection lifting device, the fixture positioning block 1 and the detection assembly are arranged on the lifting base of the detection lifting device, and are driven to rise or fall by the detection lifting device. A curved knife device and a curved knife angle detection method are also disclosed. The solution of the present invention is reasonable and ingenious in structure, can quickly and accurately detect whether the bending angle of the blade meets the requirements, and can feedback the parameters to the bending device for bending angle adjustment, improving the bending accuracy of the bending device.

Description

Technical Field

[0001] The present application relates to the field of blade processing, and particularly relates to a bent blade angle detection device, a bent blade device and an angle detection method for detecting the bent angle of a blade after bending. Background Art

[0002] Installing a blade in the blade slot of a knife template and punching a material through the blade is a very common processing method in the industry at present. The size of the blade slot on the knife template needs to be adapted to the blade, so that the blade will not fall off or shake after being installed in the blade slot, avoiding affecting the punching quality of the product.

[0003] Since the shapes of different materials and products are different, the blade slots and blades may be curved and angled, rather than straight long strips. In the industry, installing a blade on a blade slot requires a professional knife installer with rich experience, and it is difficult for ordinary technicians to be competent. For the blades bent by the commonly used bending machines on the market, their bending angles often deviate from the designed angles. When installing the blades, the installer needs to manually adjust the bending angle of the blade time and time again based on experience, and bend the bending angle of the blade to match the folding angle of the blade slot before the blade can be installed in the blade slot. This process is often time-consuming and laborious, delaying the normal production.

[0004] Developing a bent blade angle detection device, and applying the bent blade angle detection device to a bending machine to form a bent blade device with bent blade angle detection, and a bent blade angle detection method based on the detection device and the bent blade device have become a need in the industry. Summary of the Invention

[0005] In view of at least one of the above technical problems, the present application provides a bent blade angle detection device, a bent blade device and a bent blade detection method.

[0006] An embodiment of the first aspect of the present application provides a bent blade angle detection device, including:

[0007] A fixture positioning block for positioning the straight segment of the blade, facilitating the measurement of the angle between the straight segment and the bent segment of the blade;

[0008] A detection component, which is arranged above or below the fixture positioning block, and can touch the wall surface of the bent segment after rotation;

[0009] And a detection lifting device, the fixture positioning block 1 and the detection component are arranged on the lifting base of the detection lifting device, and are driven to rise or fall by the detection lifting device.

[0010] As a further improvement of the present invention, the detection component includes:

[0011] A servo motor rotates to drive the detection component to rotate, and the bending angle of the blade is calculated based on the rotation angle of the servo motor.

[0012] A detection swing arm, the head end of which is fixed on the rotating shaft of the servo motor;

[0013] A detection probe is arranged on the detection swing arm. After the detection swing arm swings, the detection probe can touch the wall surface of the bent section.

[0014] As a further improvement of the present invention, the fixture positioning block includes:

[0015] A positioning block body, the head end of which is fixed on the detection lifting device, and the two side surfaces at the other end of the positioning block body are set as inclined surfaces towards the center position;

[0016] A positioning groove is arranged at the top of the positioning block body and penetrates through the left and right end faces. The width of the positioning groove is adapted to the thickness of the blade.

[0017] As a further improvement of the present invention, the detection lifting device includes:

[0018] A lifting bracket;

[0019] A lifting power component, which is fixed at one end of the lifting bracket;

[0020] A lifting base is arranged on the lifting bracket in a vertically movable manner, and the output end of the lifting power component is fixedly connected to the lifting base.

[0021] As a further improvement of the present invention, an avoidance space is arranged on the lifting base. The servo motor is fixed below the lifting base, and the rotating shaft is located in the avoidance space. The fixture positioning block is fixed above the lifting base. When the bent part of the blade is closely attached to the right end face of the positioning groove, the bent part of the blade is located on the central axis of the rotating shaft.

[0022] As a further improvement of the present invention, a column is arranged at the top of the end of the detection swing arm, and the detection probe is arranged on the column.

[0023] A machete device, which includes:

[0024] A bending device for bending a long and straight blade at a set angle;

[0025] A shearing device for cutting off the bent blade from the long blade;

[0026] And the aforementioned machete angle detection device;

[0027] The curved knife angle detection device is disposed between the bending device and the shearing device in a liftable manner.

[0028] As a further improvement of the present invention, a bending groove for passing a blade is provided on the bending die of the bending device, and a fixing groove for fixing the blade is provided on the shearing device. When the bending die does not rotate for bending, the bending groove, the positioning groove and the fixing groove are located on the same plane.

[0029] A method for detecting the angle of a curved knife, which comprises the following steps:

[0030] Set the torque limit value of the servo motor. When the detection probe touches the wall surface of the blade and reaches the torque limit value, the servo motor will stop moving;

[0031] Before the blade is bent, rotate the servo motor, the detection probe contacts the blade, the resistance of the detection probe acts on the servo motor, so that the force torque of the servo motor reaches the torque setting limit value of the servo motor, and thus the servo motor stops rotating. The contact position between the detection probe and the blade is position 1, and the rotation angle W1 relative to the zero position of the servo motor is recorded;

[0032] After the blade is bent at the set bending angle, rotate the servo motor, the detection probe contacts the bent section of the blade. At this time, the bent part of the blade is located on the central axis of the rotation shaft of the servo motor, the torque of the servo motor reaches the torque limit value, the motor stops rotating, and the contact position between the detection probe and the bent section of the blade is position 2, and the rotation angle W2 relative to the zero position of the servo motor is recorded;

[0033] By using the formulas bending angle A = W2 - W1 and bending complementary angle B = 180 - (W2 - W1), it can be calculated whether the actual bending angle of the blade meets the requirements. If it is too small or too large, the difference is fed back to the device for secondary bending until the bending angle meets the requirements.

[0034] As a further improvement of the present invention, the bent blade is conveyed towards the shearing device, the lifting power assembly drives the lifting base to rise, avoiding the bent section and making the straight section fall into the positioning groove for positioning; after the angle measurement of the curved knife is completed, the lifting power assembly drives the lifting base to descend, and the blade disengages from the positioning groove and continues to be conveyed towards the shearing device.

[0035] The embodiments of the present application have the following technical effects: The structure of the present invention is reasonable and ingenious. Setting the torque limit value of the servo motor can avoid applying excessive external force to the blade, causing the blade to deform and affecting the accuracy of the monitoring data. When the detection probe contacts the blade and reaches the torque limit value, the servo motor stops rotating. The encoder integrated with the servo motor immediately feeds back parameters such as the rotation angle of the servo motor to the host computer, which is sensitive, fast, and highly accurate. The bending tool device can obtain the bending angle of the blade based on the fed-back rotation angle. If the bending angle does not match the set bending angle, being too large or too small, the difference is compensated into the bending angle of the bending tool device, and the bending device is controlled to bend according to the adjusted parameters, so that the bending angle of the blade meets the set requirements, reducing the requirements for adjusting the bending angle of the blade in the subsequent tool loading process, thereby reducing the dependence on the tool loading master, enabling ordinary workers to meet the tool loading requirements, reducing labor costs, shortening the tool loading time, and reducing production costs.

[0036] The following further describes the present invention in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 It is a three-dimensional structural schematic diagram of the bending angle detection device in the present invention;

[0039] Figure 2 It is a structural schematic diagram of the bending tool device in the present invention;

[0040] Figure 3 It is a top view of the present invention when detecting the straight state of the blade;

[0041] Figure 4 It is a top view of the present invention when detecting the bent state of the blade;

[0042] Figure 5 It is a schematic diagram of the detection principle of the present invention;

[0043] Figure 6 It is a structural schematic diagram of the inspection fixture positioning block in the present invention;

[0044] Figure 7 It is a structural schematic diagram of the detection component in the present invention;

[0045] Figure 8 It is a structural schematic diagram of the detection lifting device in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0046] In order to make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0047] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0048] In the description of the present application, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0049] In the embodiments of the present application, unless otherwise clearly defined and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0050] As Figures 1 to 8 shown, an embodiment of the first aspect of the present application provides a machete angle detection device, including:

[0051] A fixture positioning block 1 for positioning the straight segment of the blade to facilitate measuring the angle between the straight segment 51 and the bent segment 52 of the blade 5;

[0052] A detection assembly 2, which is disposed above or below the fixture positioning block 1 and can touch the wall surface of the bent segment after rotation; in this embodiment, the detection assembly 2 is located below the fixture positioning block 1.

[0053] And a detection lifting device 3, the inspection fixture positioning block 1 and the detection component 2 are arranged on a lifting base 35 of the detection lifting device 3, and are driven to rise or fall by the detection lifting device 3.

[0054] As a further improvement of the present invention, the detection component 2 includes:

[0055] A servo motor 21, the servo motor 21 rotates to drive the detection assembly 2 to rotate, and the blade bending angle is calculated according to the rotation angle of the servo motor 21;

[0056] The servo motor 21 and the encoder are integrated, or a separate structure can be adopted. The encoder collects parameters such as the rotation angle of the servo motor 21 in the bending angle detection and feeds them back to the host computer, so as to determine whether the bending angle of the blade meets the requirements. If not, the difference is obtained, and the bending angle is controlled according to the difference, so that the blade angle can be bent more accurately.

[0057] The host computer can be a separate control chip such as a single-chip microcomputer, or a control system built into the machete machine. Therefore, the machete angle detection device in this application can be used as a separate device to detect the bending angle of the blade, or it can be integrated into the machete machine to form a machete device for use.

[0058] In some other embodiments, the motor may be a coreless motor, so that the friction of the internal structure of the motor is smaller and the movement speed is faster.

[0059] A detection swing arm 22, the head end of which is fixed on the rotating shaft 211 of the servo motor 21;

[0060] The detection probe 23 is disposed on the detection swing arm 22. After the detection swing arm 22 swings, the detection probe 23 can touch the wall surface of the bending section.

[0061] When the blade is placed in the positioning groove, the blade can be located above or below the detection swing arm 22. When the detection swing arm 22 swings, the blade will not touch the detection swing arm 22. In this embodiment, the blade is located above the detection swing arm 22. The detection probe 23 can be fixed to the top, side wall or end of the detection swing arm 22. As long as a part of the detection probe 23 is at the same level as the blade, when the detection swing arm 22 rotates, the blade will touch the detection probe 23.

[0062] In this embodiment, the detection probe 23 may be a cylinder or a sphere.

[0063] As a further improvement of the present invention, the inspection fixture positioning block 1 comprises:

[0064] The positioning block body 11 has its head end fixed to the detection lifting device 3. The two side surfaces of the other end of the positioning block body 11 are set as inclined surfaces 12 facing the central position. By setting the two side surfaces of the other end of the positioning block body 11 as inclined surfaces 12, a tip is formed, making the positioning block body 11 smaller in volume, facilitating the installation of this application in the limited space of the bending machine, realizing the automated assembly line operation of blade bending, angle on-line detection and cutting, and improving production efficiency.

[0065] The positioning groove 13 is arranged at the top of the positioning block body 11 and penetrates through the left and right end faces. The width of the positioning groove 13 is adapted to the thickness of the blade. The width of the positioning groove 13 is adapted to the thickness of the blade, and the blade placed in the positioning groove 13 will not shake, improving the accuracy of angle detection.

[0066] When performing the bending angle detection of the bending knife, the straight segment 51 of the blade is placed in the positioning groove 13, and the bent segment 52 of the blade is located at the right end of the positioning groove 13. At this time, the bending position of the blade coincides with the central axis of the rotating shaft 211 of the servo motor 21. In some embodiments, one end of the straight segment 51 of the blade can extend out of the left end of the positioning groove 13 and extend all the way to the bending die of the bending device; in other embodiments, one end of the straight segment 51 of the blade can be located in the positioning groove 13.

[0067] As a further improvement of the present invention, the detection lifting device 3 includes:

[0068] The lifting bracket 31;

[0069] The lifting power assembly 32 is fixed to one end of the lifting bracket 31. The lifting power assembly 32 can be a motor drive structure, a cylinder drive structure, etc. In this application, the lifting power assembly 32 includes a lifting motor 321, a lead screw 322 connected to the rotating shaft 211 of the lifting motor 321. A rotating block that is threadedly engaged with the lead screw 322 is provided on the lead screw 322. The rotating block is fixedly connected to the lifting base 35 through a mounting plate 324. The lifting motor 321 is fixed to the lifting bracket 31. A guide rail 325 is further provided on the lifting bracket 31, and a slider 326 that is matched with the guide rail 325 is provided on the mounting plate 324.

[0070] Lifting base 35, which is movably arranged on the lifting bracket 31 in the up and down direction, and the output end of the lifting power assembly 32 is fixedly connected to the lifting base 35. As a further improvement of the present invention, an avoidance position is provided on the lifting base 35, the servo motor 21 is fixed below the lifting base 35, the rotating shaft 211 is located in the avoidance position, the fixture positioning block 1 is fixed above the lifting base 35, and when the bent part of the blade is closely attached to the right end face of the positioning groove 13, the bent part of the blade is located on the central axis of the rotating shaft 211.

[0071] The lifting base 35 is a square block, and a plurality of hole positions for fixing the servo motor 21 are provided on the lower surface of the lifting base 35. The avoidance position 311 is a circular through hole, and counterbores are respectively provided at both ends of the circular through hole. In this embodiment, all or the lower part of the detection swing arm 22 is placed in the avoidance position 311, further reducing the space occupied by the curved knife angle detection device.

[0072] As a further improvement of the present invention, a column 24 is provided at the top of the end of the detection swing arm 22, and the detection probe 23 is provided on the column 24. The detection probe 23 can be fixedly connected to the column 24; it can also be movably arranged thereon, the detection probe 23 overlaps with the central axis of the column 24, and the detection probe 23 can rotate.

[0073] A curved knife device, which includes:

[0074] A bending device 8 for bending a long and straight blade at a set angle;

[0075] A shearing device 7 for cutting off the bent blade from the long blade;

[0076] And the aforementioned curved knife angle detection device 6;

[0077] The curved knife angle detection device 6 is arranged between the bending device 8 and the shearing device 7 in a liftable manner.

[0078] The bending device 8 and the shearing device 7 are prior arts in the field, and the blade is bent at a set angle by the bending die of the bending device 8;

[0079] The curved knife angle detection device 6 detects the formed angle after bending. If the detected angle does not match the predetermined angle, the parameters are fed back to the host computer to adjust the bending angle of the bending device 8, so as to be able to bend qualified blades. If the detected angle is consistent with the set angle, the shearing device 7 cuts off the bent blade according to the set length.

[0080] As a further improvement of the present invention, a bending groove for inserting a blade is provided on the bending die of the bending device 8, and a fixing groove for fixing the blade is provided on the shearing device 7. When the bending die does not rotate for bending, the bending groove, the positioning groove 13 and the fixing groove are located on the same plane.

[0081] A method for detecting the angle of a bending knife, which comprises the following steps:

[0082] Set the torque limit value of the servo motor 21. When the detection probe 23 touches the wall surface of the blade and reaches the torque limit value, the servo motor 21 will stop moving;

[0083] Before the blade is bent, rotate the servo motor 21 so that the detection probe 23 contacts the blade. The resistance of the detection probe 23 against the blade reacts back to the servo motor 21, so that the applied torque of the servo motor 21 reaches the torque setting limit value of the servo motor 21, and thus the servo motor 21 stops rotating. The contact position between the detection probe 23 and the blade is position 1, and the rotation angle W1 relative to the zero position of the servo motor 21 is recorded;

[0084] After the blade is bent at the set bending angle, rotate the servo motor 21 so that the detection probe 23 contacts the bent section of the blade. At this time, the bent part of the blade is located on the central axis of the rotating shaft 211 of the servo motor 21. The torque of the servo motor 21 reaches the torque limit value, and the motor stops rotating. The contact position between the detection probe 23 and the bent section of the blade is position 2, and the rotation angle W2 relative to the zero position of the servo motor 21 is recorded;

[0085] By using the formula bending angle A = W2 - W1 and bending complementary angle B = 180 - (W2 - W1), it can be calculated whether the actual bending angle of the blade meets the requirements. If it is too small or too large, the difference is fed back to the device for secondary bending until the bending angle meets the requirements.

[0086] The servo motor 21 enables the speed (torque) mode and sets a suitable torque limit value to control the start and stop of the servo motor 21. When the detection probe 23 rotates in the speed mode, if there is no external force acting on it and the real-time torque of the servo motor 21 does not reach the set torque limit value, the servo motor 21 will continue to move; if there is an obstacle applying an external force to the detection probe 23 and the real-time torque of the servo motor 21 reaches the set torque limit value, the servo motor 21 will stop moving.

[0087] Set the torque limit value of the servo motor 21. When the detection probe 23 touches the wall surface of the blade and reaches the torque limit value, the servo motor 21 will stop moving;

[0088] Such as Figure 5As shown in the figure, the bent blade is regarded as an obstacle that applies an external force to the servo motor 21. Before the blade is bent (in a straight state), the contact detection probe 23 is used to make it stop, and the actual position of the servo motor 21 at this time is recorded as position 1 (the angle value relative to the motor zero position). At this time, the rotation angle of the servo motor 21 is W1. After the blade is bent (in a bent state), the contact detection probe 23 is used to make it stop, and the actual position of the motor at this time is recorded as position 2 (the angle value relative to the motor zero position). At this time, the rotation angle of the servo motor 21 is W2. Subsequently, the bending angle of the blade can be obtained from position 1 and position 2. That is, the bending angle A = W2 - W1 and the bending supplementary angle B = 180 - (W2 - W1) can be calculated through the formula to obtain the actual bending angle of the blade.

[0089] In this detection method, the torque of the servo motor 21 is easy to control, adjust, and has a large control range and high precision.

[0090] The motor and the encoder are integrated, and the feedback precision is high. There is no problem with the motor response speed in this detection method because the feedback position is obtained after the motor completely stops under the action of an external force.

[0091] The setting of the torque limit value is relatively crucial, generally 0 - 10N. It is necessary to ensure that the self-friction is overcome under the condition of no external force (generally, the friction of the motor shaft itself is very small), and it is also necessary to ensure that no plastic deformation occurs after contact with the obstacle. Among them, 0.01N - 0.11N is a preferred range of this embodiment.

[0092] As a further improvement of the present invention, the bent blade is conveyed in the direction of the shearing device 7. The lifting power assembly 32 drives the lifting base 35 to rise, avoiding the bent section and making the straight section 51 fall into the positioning groove 13 for positioning. After the measurement of the bending angle of the curved blade is completed, the lifting power assembly 32 drives the lifting base 35 to descend, and the blade disengages from the positioning groove 13 and continues to be conveyed in the direction of the shearing device 7.

[0093] The structure of the present invention is reasonable and ingenious. Setting the torque limit value of the servo motor 21 can avoid applying excessive external force to the blade, causing the blade to deform and affecting the accuracy of the monitoring data. When the detection probe 23 contacts the blade and reaches the torque limit value, the servo motor 21 stops rotating. The encoder integrated with the servo motor 21 timely feeds back parameters such as the rotation angle of the servo motor 21 to the upper computer, which is sensitive, fast, and has high precision. The bending tool device can obtain the bending angle of the blade based on the fed-back rotation angle. If the bending angle does not match the set bending angle, being too large or too small, the difference is compensated into the bending angle of the bending tool device, and the bending device 8 is controlled to bend according to the adjusted parameters, so that the bending angle of the blade meets the set requirements, reducing the requirements for adjusting the bending angle of the blade in the subsequent blade installation process, thus reducing the dependence on the blade installation master, enabling ordinary workers to meet the blade installation requirements, reducing labor costs, shortening the blade installation time, and reducing production costs.

[0094] The above are only the preferred embodiments of the present application and do not impose any formal restrictions on the present application. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present application or modify it into equivalent embodiments with equivalent changes without departing from the scope of the technical solution of the present application. Therefore, all equivalent changes made according to the shape, structure, and principle of the present application without departing from the content of the technical solution of the present application shall be covered by the protection scope of the present application.

Claims

1. A method for detecting the angle of a curved knife, characterized in that, it includes a curved knife device, which includes: a bending device for bending a long and straight blade at a set angle; a cutting device for cutting off the bent blade from the long blade; and a curved knife angle detection device; the curved knife angle detection device is disposed between the bending device and the cutting device in a liftable manner; the curved knife angle detection device includes: a jig positioning block for positioning the straight segment of the blade to facilitate measuring the angle between the straight segment and the bent segment of the blade; a detection component, the detection component is disposed above or below the jig positioning block, and after rotation, the detection component can touch the wall surface of the bent segment; and a detection lifting device, the detection lifting device includes a lifting power component, the jig positioning block and the detection component are disposed on the lifting base of the detection lifting device, and are driven to rise or fall by the detection lifting device; the jig positioning block includes: a positioning block body, the head end of the positioning block body is fixed to the detection lifting device, and the two side surfaces at the other end of the positioning block body are set as inclined surfaces towards the center position; a positioning groove, the positioning groove is disposed at the top of the positioning block body and penetrates the left and right end surfaces, and the width of the positioning groove is adapted to the thickness of the blade; the detection component includes: a servo motor, the servo motor rotates to drive the detection component to rotate, and the bending angle of the blade is calculated by the rotation angle of the servo motor; a detection swing arm, the head end of the detection swing arm is fixed to the rotating shaft of the servo motor; a detection probe, the detection probe is disposed on the detection swing arm, and after the detection swing arm swings, the detection probe can touch the wall surface of the bent segment; it includes the following steps: Before the blade is bent, rotate the servo motor, the detection probe contacts the blade, the resistance of the detection probe acts on the servo motor, so that the torque of the servo motor reaches the torque setting limit value of the servo motor, and then the servo motor stops rotating. The contact position between the detection probe and the blade is position 1, and the rotation angle W1 relative to the zero position of the servo motor is recorded; When the blade is bent at the set bending angle, rotate the servo motor, the detection probe contacts the bent segment of the blade. At this time, the bent part of the blade is on the central axis of the rotating shaft of the servo motor, the torque of the servo motor reaches the torque limit value, and the motor stops rotating. The contact position between the detection probe and the bent segment of the blade is position 2, and the rotation angle W2 relative to the zero position of the servo motor is recorded; By the formula bending angle A = W2 - W1, bending complementary angle B = 180 - (W2 - W1), the actual bending angle of the blade can be calculated to see if it meets the requirements. If it is too small or too large, the difference is fed back to the device for secondary bending until the bending angle meets the requirements; The bent blade is conveyed towards the cutting device, the lifting power component drives the lifting base to rise, avoiding the bent segment and making the straight segment fall into the positioning groove for positioning; after the curved knife angle measurement is completed, the lifting power component drives the lifting base to descend, and the blade disengages from the positioning groove and continues to be conveyed towards the cutting device.

2. The method for detecting the angle of a curved knife according to claim 1, characterized in that, the detection lifting device includes: a lifting bracket; The lifting power assembly is fixed to one end of the lifting bracket; The lifting base is movably arranged on the lifting bracket in the up and down direction, and the output end of the lifting power assembly is fixedly connected to the lifting base.

3. The method for detecting the angle of the curved knife according to claim 2, characterized in that a clearance position is provided on the lifting base, the servo motor is fixed below the lifting base, the rotating shaft is located in the clearance position, the fixture positioning block is fixed above the lifting base, and when the bent portion of the blade is closely attached to the right end face of the positioning groove, the bent portion of the blade is located on the central axis of the rotating shaft.

4. The method for detecting the angle of the curved knife according to claim 3, characterized in that a column is provided at the top of the end of the detection swing arm, and the detection probe is provided on the column.

5. The method for detecting the angle of the curved knife according to claim 1, characterized in that a bending groove for threading the blade is provided on the bending die of the bending device, a fixing groove for fixing the blade is provided on the shearing device, and when the bending die does not rotate for bending, the bending groove, the positioning groove and the fixing groove are located on the same plane.

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