Positioning mechanism for a bending machine

Abstract

The utility model discloses a positioning mechanism for bending machine relates to bending machine, including being located first guide pulley and second guide pulley and vertical two perpendicular line in symmetry distribution and relative movement's third guide pulley, the outside of third guide pulley is arc surface, and arc surface is provided with a plurality of first strip convexes of circular array distribution, the outside of first guide pulley and second guide pulley is C surface, and C surface is provided with a plurality of second strip convexes of circular array distribution. The utility model discloses a structure that symmetric drive guide pulley with antiskid convex is adopted to the cooperation of vertical pressure guide pulley, realizes the automatic, accurate feeding and reliable antiskid of sheet metal, and effectively promotes the bending accuracy and protects workpiece surface.

Description

Technical Field

[0001] This utility model relates to a bending machine, specifically a positioning mechanism for a bending machine. Background Technology

[0002] Bending machines are key pieces of equipment in sheet metal processing, used to precisely bend and shape metal sheets. In the bending process, the positioning accuracy and feed stability of the sheet metal directly determine the quality of the final product.

[0003] Traditional bending machine positioning mainly relies on the back gauge mechanism, which uses a set of programmable stops as reference points. Operators or auxiliary devices push the sheet metal to these stops for positioning. This method has several inherent drawbacks: First, when bending long or large sheets, manual pushing makes it difficult to ensure perfect perpendicular contact between the sheet metal and the stops, easily causing angular deviations and affecting the straightness of the bending line. Second, during continuous bending, the sheet metal needs to be moved and repositioned multiple times; each collision with the hard stops can scratch or dent the sheet metal surface, affecting the product's appearance quality. Finally, the entire process has a low degree of automation, heavily relying on the operator's experience and physical strength, resulting in a bottleneck in production efficiency.

[0004] To address the aforementioned issues, some existing technologies employ roller-driven feeding mechanisms. However, these mechanisms are typically complex in structure or still suffer from insufficient driving friction, leading to slippage and displacement of the sheet metal during bending. This is particularly problematic when processing smooth or coated sheet metal, where poor positioning stability directly impacts bending accuracy. Utility Model Content

[0005] The purpose of this invention is to provide a positioning mechanism for a bending machine to address the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a positioning mechanism for a bending machine, comprising a first guide wheel and a second guide wheel symmetrically distributed on the same straight line, and a third guide wheel perpendicular to the perpendicular line between the two and moving relative to each other; The outer surface of the third guide wheel is an arc-shaped surface, and multiple first strip-shaped protrusions distributed in a circular array are provided on the arc-shaped surface; The outer surfaces of the first and second guide wheels are C-surfaces, and multiple second strip-shaped protrusions arranged in a circumferential array are provided on the C-surfaces.

[0007] Preferably, the device also includes a mounting bracket, on which an operating surface is fixedly mounted, and the first guide wheel and the second guide wheel are rotatably mounted on the operating surface.

[0008] Preferably, a rotating shaft is fixedly installed on the second guide wheel and the first guide wheel, a sprocket is fixedly installed on the two rotating shafts, and a chain is assembled between the two sprockets.

[0009] Preferably, a stepper motor is fixedly mounted on the mounting bracket, and the stepper motor is fixedly connected to one of the rotating shafts.

[0010] Preferably, the first guide wheel, the second guide wheel, and the third guide wheel are made of cast iron.

[0011] Preferably, a guide rail is fixedly installed on the operating surface, a movable component is slidably disposed inside the guide rail, and the third guide wheel is rotatably disposed on the movable component.

[0012] Preferably, the guide rail is threaded with a threaded rod, and the threaded rod is rotatably connected to the moving part. A handle is fixedly installed at the end of the threaded rod.

[0013] Preferably, the first guide wheel, the second guide wheel, and the third guide wheel have the same circumferential radius.

[0014] In the above technical solution, the positioning mechanism for a bending machine provided by this utility model has the following beneficial effects: 1. The symmetrical drive assembly consisting of the first and second guide wheels can actively clamp and drive the sheet metal to move, replacing the traditional manual pushing. This drive method not only improves production efficiency but also ensures that the sheet metal always moves in a straight line during the feeding process, fundamentally eliminating the problem of non-straight bending lines caused by human pushing deviations and significantly improving bending accuracy; 2. Circularly arrayed strip-shaped protrusions are provided on the surfaces of the first, second, and third guide rollers. These protrusions greatly increase the friction between the guide rollers and the sheet metal contact surface, effectively overcoming the tendency of the sheet metal to recoil during bending and preventing slippage. This ensures that the positioning of the sheet metal does not change during the bending action, thereby ensuring the accuracy and consistency of each bending angle. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 A schematic diagram of the overall structure provided for an embodiment of this utility model; Figure 2A schematic diagram of the sprocket and chain provided in an embodiment of this utility model; Figure 3 A schematic diagram of the guide rail, threaded rod, and moving part provided in the embodiments of this utility model; Figure 4 A schematic diagram of the moving part and the third guide wheel provided in an embodiment of this utility model; Figure 5 A schematic diagram of the structure of the first guide wheel provided in an embodiment of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1. First guide wheel; 2. Second guide wheel; 3. Third guide wheel; 31. Arc-shaped surface; 32. First strip-shaped protrusion; 40. C-surface; 41. Second strip-shaped protrusion; 5. Mounting bracket; 51. Operating surface; 52. Stepper motor; 53. Guide rail component; 531. Threaded rod; 54. Moving component; 6. Rotating shaft; 7. Sprocket; 71. Chain. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0019] Please see Figure 1-5 This utility model provides a technical solution: a positioning mechanism for a bending machine includes a mounting frame 5, and a first guide wheel 1, a second guide wheel 2, and a third guide wheel 3 disposed on the mounting frame 5. The first guide wheel 1 and the second guide wheel 2 are located on the same straight line and symmetrically distributed, together forming a driving assembly. The third guide wheel 3 is located perpendicular to the perpendicular line between the first guide wheel 1 and the second guide wheel 2, and can move relative to both, forming a clamping assembly.

[0020] The outer surface of the third guide wheel 3 is designed as an arc-shaped surface 31. Multiple first strip-shaped protrusions 32 arranged in a circular array are machined on this arc-shaped surface 31. Similarly, the outer surfaces of the first guide wheel 1 and the second guide wheel 2 are cylindrical surfaces (i.e., surface C 40), and multiple second strip-shaped protrusions 41 arranged in a circular array are also provided on this surface C 40. The function of these strip-shaped protrusions (32, 41) is to significantly increase the friction between the guide wheel and the sheet metal, effectively preventing slippage of the sheet metal during feeding or bending, and ensuring positioning accuracy. Preferably, the first guide wheel 1, the second guide wheel 2, and the third guide wheel 3 are made of cast iron to ensure their structural strength and wear resistance, and the circumference radii of the three are kept consistent to ensure the coordination of movement and the uniformity of force distribution.

[0021] A horizontal operating surface 51 is fixedly mounted on the mounting bracket 5 to support the sheet metal. The first guide wheel 1 and the second guide wheel 2 are rotatably mounted on the operating surface 51 via a structure such as a bearing seat.

[0022] To achieve synchronous and co-directional rotation of the first guide wheel 1 and the second guide wheel 2, this invention employs a chain drive system. Specifically, a sprocket 7 is fixedly mounted on the rotating shaft 6 of the first guide wheel 1 and the second guide wheel 2, and the two sprockets 7 are connected by a chain 71. A stepper motor 52 is fixedly mounted on the mounting frame 5, and the output shaft of the stepper motor 52 is fixedly connected to one of the rotating shafts 6 (e.g., the rotating shaft of the first guide wheel 1) via a coupling. When the stepper motor 52 starts, it drives the first guide wheel 1 and the second guide wheel 2 to rotate synchronously through the chain drive system, thereby actively clamping and driving the sheet metal forward or backward in a straight line, just like a "roller," completely replacing the inefficient and inaccurate manual pushing.

[0023] The moving and pressing function of the third guide wheel 3 is achieved through a precision linear motion mechanism. A guide rail 53 is fixedly installed on the operating surface 51, and the direction of the guide rail 53 is perpendicular to the line connecting the first and second guide wheels. A movable component 54 is slidably disposed within the guide rail 53. The third guide wheel 3 is rotatably mounted on this movable component 54 via bearings.

[0024] To control the movement of the moving part 54 and its third guide wheel 3, a threaded rod 531 is threadedly connected to the guide rail 53. One end of the threaded rod 531 is rotatably connected to the moving part 54 (e.g., via a bearing), and the other end is fixedly fitted with a handle. By manually rotating the handle, the operator can precisely adjust the screw depth of the threaded rod 531, thereby driving the moving part 54, together with the third guide wheel 3, to smoothly approach or move away from the sheet metal along the guide rail 53, thus controlling the clamping force on the sheet metal. This design allows the third guide wheel 3 to provide sufficient pressure to prevent the sheet metal from shifting during bending, while its curved surface 31 avoids damage to the sheet metal surface.

[0025] Working principle: In actual operation, the sheet metal is placed on the operating surface 51 and positioned between the first guide wheel 1 and the second guide wheel 2. The stepper motor 52 operates, driving the first and second guide wheels to rotate synchronously, conveying the sheet metal to the predetermined bending position. Subsequently, the operator rotates the handle to drive the third guide wheel 3 forward, pressing the sheet metal from above. At this time, the upper slide of the bending machine descends to perform the bending operation.

[0026] During the bending process, the strip-shaped protrusions on the surfaces of the three guide rollers provide significant friction, ensuring that the sheet metal does not shrink or shift due to the bending force, thus guaranteeing the accuracy of the bending angle. After bending is complete, the third guide roller 3 retracts to release the sheet metal, and the stepper motor 52 drives the sheet metal to move to the next bending position, achieving continuous, automated, and efficient production.

[0027] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A positioning mechanism for a bending machine, characterized in that, It includes a first guide wheel (1) and a second guide wheel (2) symmetrically distributed on the same straight line, and a third guide wheel (3) perpendicular to the midline of the two and moving relative to each other. The outer surface of the third guide wheel (3) is an arc-shaped surface (31), and multiple first strip-shaped protrusions (32) are arranged in a circular array on the arc-shaped surface (31). The outer surfaces of the first guide wheel (1) and the second guide wheel (2) are C-surfaces (40), and multiple second strip-shaped protrusions (41) arranged in a circular array are provided on the C-surfaces (40).

2. The positioning mechanism for a bending machine according to claim 1, characterized in that, It also includes a mounting bracket (5), on which an operating surface (51) is fixedly mounted, and the first guide wheel (1) and the second guide wheel (2) are rotatably mounted on the operating surface (51).

3. A positioning mechanism for a bending machine according to claim 2, characterized in that, A rotating shaft (6) is fixedly installed on the second guide wheel (2) and the first guide wheel (1), and a sprocket (7) is fixedly installed on the two rotating shafts (6). A chain (71) is assembled between the two sprockets (7).

4. A positioning mechanism for a bending machine according to claim 3, characterized in that, A stepper motor (52) is fixedly mounted on the mounting bracket (5), and the stepper motor (52) is fixedly connected to one of the rotating shafts (6).

5. A positioning mechanism for a bending machine according to claim 1, characterized in that, The first guide wheel (1), the second guide wheel (2) and the third guide wheel (3) are made of cast iron.

6. A positioning mechanism for a bending machine according to claim 4, characterized in that, A guide rail (53) is fixedly installed on the operating surface (51), and a movable part (54) is slidably arranged inside the guide rail (53). The third guide wheel (3) is rotatably arranged on the movable part (54).

7. A positioning mechanism for a bending machine according to claim 6, characterized in that, The guide rail (53) is threaded with a threaded rod (531), and the threaded rod (531) is rotatably connected to the moving part (54). A handle is fixedly installed at the end of the threaded rod (531).

8. A positioning mechanism for a bending machine according to claim 1, characterized in that, The first guide wheel (1), the second guide wheel (2), and the third guide wheel (3) have the same circumference.

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