Low-stress clamping fixture with anti-loosening function

Abstract

The utility model relates to the technical field of low-stress clamping fixtures, and discloses a low-stress clamping fixture with an anti-loosening function, which comprises a base, a fixing column is arranged in the base, a servo motor is arranged at the lower end of the base, a gear is fixedly connected to the output end of the servo motor, the gear is positioned in the base, and the gear is meshed with a gear ring. The inner side wall of the gear ring is fixedly connected with a rotating block, six through holes are formed in the upper end of the rotating block, six rotating columns are arranged in the rotating block, the rotating columns are located in the through holes respectively, the rotating columns are connected with the through holes in a sliding mode, and the upper ends of the rotating columns are fixedly connected with clamping seats. Therefore, the stress concentration phenomenon is remarkably reduced, damage to the workpiece caused by excessive stress is avoided, friction force is increased through a rubber plate, loosening of the workpiece is avoided, and the clamping base is prevented from exerting excessive pressure on the workpiece through electrical connection between a pressure sensor and a servo motor and a controller.

Description

Technical Field

[0001] The utility model relates to the technical field of low-stress clamping fixtures, in particular to a low-stress clamping fixture with an anti-loosening function. Background Art

[0002] A low-stress clamp is a specially designed clamp that reduces stress concentration by dispersing the clamp pressure over the entire surface of the clamping area. During the clamping process, this clamp can effectively disperse the clamping force, reduce the risk of stress concentration and damage, and thus improve the stability and reliability of the clamping.

[0003] Chinese patent document CN209407974U discloses a clamping fixture for clamping and fixing nozzle parts. The nozzle parts include a mounting head, a mounting plate connected to the outer circle of the mounting head, and two joints to be processed. The mounting plate is processed with a through mounting hole. The two joints have the same structure and are arranged at a 90° angle, and the axes of the two joints are located in the same plane perpendicular to the axis of the mounting head. The clamping fixture includes: a clamping body, the clamping body is used to clamp and position the nozzle parts, and the nozzle parts can be arbitrarily rotated and adjusted around the axis of the mounting head, the clamping body is used to be connected to the mounting spindle of a processing equipment for processing the joints; a fixed angle locking piece, the fixed angle locking piece is detachably connected to the clamping body, the fixed angle locking piece is used to pass through the mounting hole of the nozzle part and the clamping body, so as to fix the nozzle part backward at a fixed angle to the nozzle part clamped and positioned on the clamping body, so that the axis of the joint to be processed on the nozzle part coincides with the axis of the mounting spindle of the processing equipment. The above-mentioned clamping fixture has shortcomings. Although the device can clamp the workpiece, it has limitations. The fixture is prone to stress concentration and cannot effectively disperse the clamping force, which can easily cause damage to the workpiece. Secondly, the setting must be customized separately and can only be applied to a single model of product. The scope of use is greatly limited and the practicality is relatively low.

[0004] Therefore, in order to solve such problems, we proposed a low-stress clamping fixture with anti-loosening function. Utility Model Content

[0005] The purpose of the utility model is to provide a low-stress clamping fixture with an anti-loosening function, aiming to solve the problem in the above-mentioned background technology that the existing clamping fixture is prone to stress concentration when in use and cannot effectively disperse the clamping force, thereby easily causing damage to the workpiece.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a low-stress clamping fixture with anti-loosening function, including a base, characterized in that: a slide groove is opened at the upper end of the base, a fixed column is arranged inside the base, a servo motor is arranged at the lower end of the base, a gear is fixedly connected to the output end of the servo motor, the gear is located inside the base, the gear is meshed with a gear ring, a rotating block is fixedly connected to the inner side wall of the gear ring, six through holes are opened at the upper end of the rotating block, and the angle between every two through holes is 60°, six rotating columns are arranged inside the rotating block, the rotating columns are respectively located in the through holes, one end of the rotating column away from the rotating block passes through the slide groove, one end of the rotating column located on the upper surface of the base is fixedly connected with a clamping seat, the clamping seat is located on the upper surface of the base, and the clamping seat is slidably connected to the upper surface of the base, a rubber plate is arranged on the side wall of the clamping seat, and the gear is driven to rotate by starting the servo motor, so that the gear drives the gear ring to rotate, so that the gear ring drives the rotating block to rotate, so that the rotating block drives the rotating column to slide in the through hole, so that the rotating column drives the clamping seat to move horizontally and linearly at the upper end of the base, and the clamping seat drives the rubber plate to clamp the workpiece to be processed.

[0007] Preferably, a mounting groove is provided on the side wall of the clamping seat, a pad is provided on the end of the rubber plate away from the fixing column, the pad is located in the mounting groove, a pressure sensor is provided on the end of the pad away from the rubber plate, a controller is provided on the upper end of the base, and the pressure sensor and the servo motor are electrically connected through the controller.

[0008] Preferably, a threaded column is threadedly connected inside the fixing column, and an end of the threaded column away from the base is fixedly connected to a placement plate.

[0009] Preferably, a slide groove is provided at the upper end of the base, a limiting block is fixedly connected to the lower end of the clamping seat, the limiting block is located in the slide groove, and the limiting block is slidably connected to the slide groove.

[0010] Preferably, the fixed column passes through the rotating block, and the fixed column and the rotating block are rotatably connected.

[0011] Preferably, the cushion block is in the shape of an isosceles trapezoid.

[0012] The utility model has the following beneficial effects:

[0013] In the utility model, six clamping seats can be driven by gears to clamp different types of workpieces to be processed at the same time, and uniform clamping force is applied to the workpieces through the six clamping seats, thereby significantly reducing stress concentration and avoiding damage to the workpieces caused by excessive stress. A rubber plate, a pressure sensor and a controller are provided, and the rubber plate is used to increase friction and avoid loosening of the workpiece. Secondly, the pressure sensor and the servo motor are electrically connected to the controller to control the servo motor to stop driving the gear to rotate, so as to avoid the clamping seat from applying excessive pressure to the workpiece, and avoid damaging the workpiece due to excessive pressure, which is beneficial to reducing deformation of the workpiece, protecting the workpiece surface and improving clamping stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a three-dimensional schematic diagram of a low-stress clamping fixture with an anti-loosening function proposed by the utility model;

[0015] Figure 2 This is a three-dimensional schematic diagram of the internal structure of a low-stress clamping fixture with an anti-loosening function proposed by the utility model;

[0016] Figure 3 This is a three-dimensional exploded schematic diagram of the internal structure of a low-stress clamping fixture with an anti-loosening function proposed by the utility model;

[0017] Figure 4 It is a three-dimensional exploded schematic diagram of a clamping seat in a low-stress clamping fixture with an anti-loosening function proposed by the utility model.

[0018] Legend:

[0019] 1. Base; 101. Slide; 102. Fixed column; 11. Servo motor; 12. Gear; 13. Gear ring; 14. Rotating block; 141. Through hole; 15. Rotating column; 16. Clamping seat; 161. Mounting groove; 162. Limit block; 17. Rubber sheet; 18. Pad; 181. Pressure sensor; 2. Placement plate; 21. Threaded column; 3. Controller. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the description of the present utility model, it should be noted that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 cannot be understood as a limitation on the present utility model. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0022] Reference Figure 1-4 The utility model provides an embodiment: a low-stress clamping fixture with anti-loosening function, including a base 1, a slide groove 101 is opened at the upper end of the base 1, a fixing column 102 is arranged inside the base 1, a servo motor 11 is arranged at the lower end of the base 1, a gear 12 is fixedly connected to the output end of the servo motor 11, the gear 12 is located inside the base 1, the gear 12 is meshedly connected with a gear ring 13, the gear ring 13 is located in the base 1 for positioning and rotation connection, the inner side wall of the gear ring 13 is fixedly connected with a rotating block 14, the rotating block 1 Six through holes 141 are opened at the upper end, and the angle between every two through holes 141 is 60°. Six rotating columns 15 are arranged inside the rotating block 14. The rotating columns 15 are respectively located in the through holes 141. One end of the rotating column 15 away from the rotating block 14 passes through the slide groove 101. One end of the rotating column 15 located on the upper surface of the base 1 is fixedly connected with a clamping seat 16. The clamping seat 16 is located on the upper surface of the base 1, and the clamping seat 16 is slidably connected to the upper surface of the base 1. The side wall of the clamping seat 16 is provided with a rubber plate 17.

[0023] The arrangement starts the servo motor 11 to drive the gear 12 to rotate, so that the gear 12 drives the gear ring 13 to rotate, so that the gear ring 13 drives the rotating block 14 to rotate, so that the rotating block 14 drives the rotating column 15 to slide in the through hole 141, so that the rotating column 15 drives the clamping seat 16 to move horizontally and linearly at the upper end of the base 1, so that the clamping seat 16 drives the rubber plate 17 to clamp the workpiece to be processed, and a uniform clamping force is applied to the workpiece through the six clamping seats 16, thereby significantly reducing the stress concentration phenomenon and avoiding damage to the workpiece caused by excessive stress.

[0024] A mounting groove 161 is provided on the side wall of the clamping seat 16, and a pad 18 is provided at one end of the rubber plate 17 away from the fixing column 102. The pad 18 is located in the mounting groove 161, and a pressure sensor 181 is provided at one end of the pad 18 away from the rubber plate 17. A controller 3 is provided at the upper end of the base 1, and the pressure sensor 181 and the servo motor 11 are electrically connected through the controller 3. When the clamping seat 16 drives the rubber plate 17 to clamp the workpiece, the rubber plate 17 pushes the pad 18 to apply pressure to the pressure sensor 181. When the pressure reaches a certain value, the pressure sensor 181 outputs an electrical signal, which is received by the controller 3, and then the controller 3 controls the servo motor 11 to stop driving the gear 12 to rotate, so as to prevent the clamping seat 16 from applying excessive pressure to the workpiece.

[0025] The internal thread of the fixed column 102 is connected to a threaded column 21, and the end of the threaded column 21 away from the base 1 is fixedly connected to a placement plate 2, which is used to drive the threaded column 21 to rotate by rotating the placement plate 2, thereby achieving height adjustment of the placement plate 2, making it convenient to clamp workpieces of different thicknesses and increasing the scope of application of the device.

[0026] A slide groove 101 is opened at the upper end of the base 1, and a limiting block 162 is fixedly connected to the lower end of the clamping seat 16. The limiting block 162 is located in the slide groove 101. The limiting block 162 is slidably connected to the slide groove 101 to limit the clamping seat 16, keep the clamping seat 16 in linear motion, and increase the stability of structural movement.

[0027] The fixed column 102 passes through the rotating block 14 , and the fixed column 102 and the rotating block 14 are rotatably connected, so that the rotating block 14 rotates around the fixed column 102 .

[0028] The cushion block 18 is in the shape of an isosceles trapezoid and is used to concentrate the force exerted on the rubber plate 17 and then transfer the force to the pressure sensor 181 , thereby increasing the accuracy of the pressure measurement by the pressure sensor 181 .

[0029] Working principle: First, place the workpiece on the upper end of the placement plate 2, start the servo motor 11 to rotate, and the rotation angle of the servo motor 11 should be controlled within the range of 0° to 60°, then the servo motor 11 drives the gear 12 to rotate, the gear 12 drives the gear ring 13 to rotate, the gear ring 13 drives the rotating block 14 to rotate, the rotating block 14 drives the rotating column 15 to slide in the through hole 141, the rotating column 15 drives the clamping seat 16 to move horizontally and linearly at the upper end of the base 1, the clamping seat 16 drives the rubber plate 17 to clamp the workpiece to be processed, and the workpiece is clamped by the six clamping seats 16. Apply uniform clamping force to reduce stress concentration and avoid damage to the workpiece caused by excessive stress. Then the rubber plate 17 pushes the pad 18 to apply pressure to the pressure sensor 181. When the pressure reaches a certain value, the pressure sensor 181 outputs an electrical signal, which is received by the controller 3. Then the controller 3 controls the servo motor 11 to stop the driving gear 12 from rotating to avoid the clamping seat 16 from applying excessive pressure to the workpiece. By rotating the placement plate 2, the threaded column 21 is driven to rotate, thereby realizing the height adjustment of the placement plate 2, which is convenient for clamping workpieces of different thicknesses.

[0030] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-stress clamping fixture with anti-loosening function, comprising a base (1), characterized in that: The upper end of the base (1) is provided with a slide groove (101), a fixed column (102) is arranged inside the base (1), a servo motor (11) is arranged at the lower end of the base (1), the output end of the servo motor (11) is fixedly connected to a gear (12), the gear (12) is located inside the base (1), the gear (12) is meshedly connected to a gear ring (13), the inner side wall of the gear ring (13) is fixedly connected to a rotating block (14), the upper end of the rotating block (14) is provided with six through holes (141), and the angle between every two through holes (141) is 60 degrees, six rotating columns (15) are arranged inside the rotating block (14), the rotating columns (15) are respectively located in the through holes (141), and the end of the rotating column (15) away from the rotating block (14) passes through the slide groove (101). 1), one end of the rotating column (15) located on the upper surface of the base (1) is fixedly connected to a clamping seat (16), the clamping seat (16) is located on the upper surface of the base (1), and the clamping seat (16) is slidably connected to the upper surface of the base (1), and a rubber plate (17) is provided on the side wall of the clamping seat (16), and the servo motor (11) is started to drive the gear (12) to rotate, so that the gear (12) drives the gear ring (13) to rotate, so that the gear ring (13) drives the rotating block (14) to rotate, so that the rotating block (14) drives the rotating column (15) to slide in the through hole (141), so that the rotating column (15) drives the clamping seat (16) to move horizontally and linearly at the upper end of the base (1), so that the clamping seat (16) drives the rubber plate (17) to clamp the workpiece to be processed.

2. The low-stress clamping fixture with anti-loosening function according to claim 1, characterized in that: The side wall of the clamping seat (16) is provided with a mounting groove (161); a cushion block (18) is provided at one end of the rubber plate (17) away from the fixing column (102); the cushion block (18) is located in the mounting groove (161); a pressure sensor (181) is provided at one end of the cushion block (18) away from the rubber plate (17); a controller (3) is provided at the upper end of the base (1); and the pressure sensor (181) and the servo motor (11) are electrically connected via the controller (3).

3. The low-stress clamping fixture with anti-loosening function according to claim 1, characterized in that: The fixing column (102) is internally threadedly connected to a threaded column (21), and one end of the threaded column (21) away from the base (1) is fixedly connected to a placement plate (2).

4. The low-stress clamping fixture with anti-loosening function according to claim 1, characterized in that: The lower end of the clamping seat (16) is fixedly connected to a limit block (162), the limit block (162) is located in the slide groove (101), and the limit block (162) is slidably connected to the slide groove (101).

5. The low-stress clamping fixture with anti-loosening function according to claim 1, characterized in that: The fixed column (102) passes through the rotating block (14), and the fixed column (102) and the rotating block (14) are rotatably connected.

6. The low stress clamping fixture with anti-loosening function according to claim 2, characterized in that: The cushion block (18) is in the shape of an isosceles trapezoid.

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