An auxiliary jig for a bending test

Abstract

The utility model discloses a kind of auxiliary fixtures of bending experiment, it is related to auxiliary fixture field, and this kind of auxiliary fixture of bending experiment includes the support block of L type arrangement, the top of support block is equipped with opening, support pivot is rotatably installed in opening inner wall, two pieces of centring clamps are symmetrically arranged in the included angle of support block, and two horizontal slide rails are symmetrically fixed on the longitudinal inner wall of included angle;This kind of auxiliary fixture of bending experiment is placed in the included angle of support block by setting centring structure and centring clamp, so that the measured piece on support pivot can be guided in the middle by two centring clamps, and the measured piece is guided to the pressure blade directly below, significantly improve test accuracy, avoid artificial centring error.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary clamps, and in particular to an auxiliary clamp for bending experiments. Background Technology

[0002] Existing bending resistance testing equipment uses two relatively movable support blocks with rotating support shafts mounted on top of the blocks. During testing, the workpiece is placed laterally on the two support shafts, and then pressure is applied downwards by a pressure blade located at the top center of the workpiece to test its resistance to bending. However, this existing equipment has a significant drawback: it lacks a structure for effectively centering the workpiece in the width direction, requiring manual centering. This cannot guarantee that the centerline of the workpiece is aligned with the centerline of the pressure blade, often causing the workpiece to tilt, thus affecting the test results. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, the purpose of this utility model is to provide an auxiliary fixture for bending tests, which solves the problem that existing bending resistance testing equipment lacks a centering structure, requiring manual centering of the test piece, which easily affects the test results.

[0004] To address the problems in the existing technology, the technical solution of this utility model is as follows:

[0005] An auxiliary fixture for a bending test includes an L-shaped support block with an opening at the top. A support shaft is rotatably mounted on the inner wall of the opening. Two centering clamps are symmetrically slidably mounted within the included angle of the support block. A centering mechanism for driving the two centering clamps to move relative to each other is also mounted on the inner wall of the included angle. A guide portion is formed at the upper end of the centering clamp, which is inclined. Two guide portions on both sides are arranged in an inverted "V" shape.

[0006] Optionally, two horizontally placed slide rails are symmetrically fixed on the longitudinal inner wall of the included angle, and two slide bars are fixed on the side of the centering clamp near the slide rail. The two slide bars are slidably connected to the outside of the two slide rails respectively, and corner blocks are fixed between the outer wall of the slide bars and the outer wall of the centering clamp.

[0007] Optionally, the centering mechanism includes a gear rotatably connected to the longitudinal inner wall of the included angle via a pin. A rack is fixed to the side of the centering clamp near the gear. The two racks are centrally symmetrical about the gear axis and are meshed with the gear. An elastic element is provided on the inner wall of the included angle, which makes the two centering clamps tend to be centered and close together.

[0008] Optionally, the elastic element includes two tension springs fixed on the longitudinal inner wall of the included angle. The two tension springs are arranged centrally symmetrically with the axis of the gear as the center. The ends of the two tension springs opposite to the inner wall of the included angle are respectively fixed to the ends of the two racks.

[0009] Optionally, the centering mechanism includes movable plates symmetrically slidably mounted in grooves on the transverse inner wall of the included angle, two centering clamps being slidably connected to the upper ends of the two movable plates via sliding rods, the two centering clamps being located between the two movable plates, a second spring being fixed between the centering clamps on the same side and the movable plates, a bidirectional screw being rotatably connected to the longitudinal inner wall of the included angle via bearings, the two movable plates being threaded to the two ends of the bidirectional screw via threaded holes, and a knob being fixed to one end of the bidirectional screw.

[0010] Compared with the prior art, the advantages of this utility model are as follows:

[0011] 1. This utility model, by setting a centering structure and centering clamps within the included angle of the support block, enables the test piece placed on the support shaft to be centered and guided by the two centering clamps, thus centering and aligning the test piece directly below the pressure blade, significantly improving testing accuracy and avoiding human centering errors.

[0012] 2. By setting an inclined guide part, this utility model can guide the test piece during the insertion process, making it easier for the test piece to be inserted between the two centering clips and improving the ease of operation. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0014] Figure 2 This utility model Figure 1 Enlarged diagram of point A.

[0015] Figure 3 This is a schematic diagram showing the positional relationship between the gear and rack of this utility model.

[0016] Figure 4 This is a schematic diagram showing the positional relationship between the rack and the centering clip of this utility model.

[0017] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of this utility model.

[0018] Figure 6 This is a schematic diagram showing the position of the second spring in this utility model.

[0019] Figure 7 This is a schematic diagram of the testing equipment of this utility model.

[0020] Reference numerals: 1. Support block; 101. Opening; 102. Angle; 2. Support shaft; 3. Centering clamp; 301. Guide part; 4. Slide rail; 5. Slide bar; 6. Corner block; 7. Gear; 8. Rack; 9. Tension spring; 10. Groove; 11. Moving plate; 12. Second spring; 13. Double-acting screw; 14. Knob. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1, please refer to Figures 1 to 4 This embodiment provides an auxiliary fixture for a bending test, including an L-shaped support block 1. The top of the support block 1 has an opening 101, and a support shaft 2 is rotatably mounted on the inner wall of the opening 101. Two centering clamps 3 are symmetrically arranged within the included angle 102 of the support block 1. Two horizontally placed slide rails 4 are symmetrically fixed on the longitudinal inner wall of the included angle 102. Two sliders 5 are fixed on the side of the centering clamp 3 near the slide rails 4. The two sliders 5 are slidably connected to the outside of the two slide rails 4 respectively. A corner block 6 is fixed between the outer wall of the slider 5 and the outer wall of the centering clamp 3. The corner block 6 greatly improves the connection strength between the slider 5 and the centering clamp 3. The slide rails 4 and sliders 5 allow the two centering clamps 3 to slide relative to each other within the included angle 102.

[0023] A gear 7 is rotatably connected to the longitudinal inner wall of the included angle 102 via a pin. A rack 8 is fixed to the side of the centering clamp 3 near the gear 7. The two racks 8 are arranged symmetrically about the axis of the gear 7. Both racks 8 are meshed with the gear 7. Tension springs 9 are fixed to the opposite ends of the upper and lower racks 8. The opposite ends of the two tension springs 9 are fixed to the longitudinal inner wall of the included angle 102. The tension springs 9 pull the racks 8 and apply tension to the centering clamp 3, so that the two centering clamps 3 always tend to move closer to each other.

[0024] The upper end of the centering clamp 3 has a guide portion 301, which is inclined. The two guide portions 301 on both sides are arranged in an inverted "V" shape. The guide portion 301 facilitates the insertion of the test piece between the two centering clamps 3. During testing, the test piece is held and placed above the two support shafts 2 of the testing equipment, and above the two guide portions 301. The test piece is then inserted downwards, causing it to push the guide portions 301 on both sides, causing the centering clamps 3 on both sides to move away from each other. Under the action of the gear 7 and the rack 8, the two centering clamps 3 on both sides slide synchronously until the test piece is mounted on the support shaft 2. Then, under the tension of the tension spring 9, the centering clamps 3 on both sides slide closer to each other, thus centering and guiding the test piece. Then, the pressure blade of the testing equipment descends to accurately apply pressure to the test piece. Compared with manual centering, this improves the centering accuracy and ensures the accuracy of the test results.

[0025] Example 2, please refer to Figure 5 and Figure 6The difference between this embodiment and Embodiment 1 is that two movable plates 11 are symmetrically slidably installed in the groove 10 on the transverse inner wall of the included angle 102. Four sliding rods are slidably connected to the upper end of each movable plate 11 via sliding holes. A centering clamp 3 is fixed to one end of each of the four sliding rods. Two centering clamps 3 are located between the two movable plates 11. A second spring 12 is fixed between the centering clamp 3 on the same side and the movable plate 11. A bidirectional screw 13 is rotatably connected to the longitudinal inner wall of the included angle 102 via bearings. The two movable plates 11 are respectively threadedly connected to the bidirectional screw through threaded holes. At both ends of the rod 13, a knob 14 is fixed at one end of the bidirectional screw 13. Unlike the first embodiment, this embodiment relies on external force to drive the two centering clamps 3 to move closer to each other. During operation, after the test piece is placed, the knob 14 is rotated to drive the bidirectional screw 13 to rotate, thereby causing the two moving plates 11 to move closer to each other, and causing the centering clamps 3 to move closer to each other. Finally, the centering clamps 3 abut against the outer wall of the test piece and press the second spring 12. The elastic force of the second spring 12 acts on the centering clamps 3, so that the centering clamps 3 have a force that abuts against the outer wall of the test piece.

[0026] Please see Figure 7 Based on the two embodiments described above, the existing testing equipment is briefly described. The existing testing equipment typically includes a platform with a gantry fixed on it. A pressure cutter is mounted on the gantry via a Z-axis linear motion module, which drives the pressure cutter to move up and down on the gantry. A guide rail is fixed to the top surface of the platform, with a guide groove in the middle. Two support blocks 1 are symmetrically slidably mounted on the top surface of the guide rail, ensuring that the included angle 102 of the two support blocks 1 is opposite to each other. Through holes are inserted into the support blocks 1. The guide is fitted with an external hexagonal bolt, the lower end of which extends to the lower end of the guide groove and is threaded with an external hexagonal nut. The two outer walls of the external hexagonal nut are in contact with the two longitudinal inner walls of the guide groove, so that the external hexagonal nut is slidably connected to the guide groove. Thus, when the external hexagonal bolt is rotated, the external hexagonal nut cannot rotate. In this way, the support block 1 can be fixed on the guide rail by rotating the external hexagonal bolt. After the support blocks 1 on both sides are adjusted and fixed, the test piece is installed. The test piece is mounted on the two support shafts 2.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An auxiliary fixture for a bending test, comprising an L-shaped support block (1), an opening (101) on the top of the support block (1), and a support shaft (2) rotatably mounted on the inner wall of the opening (101), characterized in that, Two centering clips (3) are symmetrically slidably installed within the included angle (102) of the support block (1), and a centering mechanism for driving the two centering clips (3) to move relative to each other is also installed on the inner wall of the included angle (102).

2. The auxiliary fixture for the bending experiment according to claim 1, characterized in that, The upper end of the centering clip (3) has a guide portion (301), which is inclined, and the two guide portions (301) on both sides are arranged in an inverted "V" shape.

3. The auxiliary fixture for the bending experiment according to claim 1, characterized in that, Two horizontally placed slide rails (4) are symmetrically fixed on the longitudinal inner wall of the included angle (102). Two slide bars (5) are fixed on the side of the centering clamp (3) near the slide rails (4). The two slide bars (5) are slidably connected to the outside of the two slide rails (4).

4. The auxiliary fixture for the bending test according to claim 3, characterized in that, A corner block (6) is fixed between the outer wall of the slider (5) and the outer wall of the centering clip (3).

5. The auxiliary fixture for the bending test according to claim 1, characterized in that, The centering mechanism includes a gear (7) rotatably connected to the longitudinal inner wall of the included angle (102) via a shaft pin. A rack (8) is fixed on the side of the centering clamp (3) close to the gear (7). The two racks (8) are arranged in a centrally symmetrical manner with the axis of the gear (7) as the center. Both racks (8) are meshed with the gear (7). An elastic element is provided on the inner wall of the included angle (102). The elastic element makes the two centering clamps (3) tend to be centered and close together.

6. The auxiliary fixture for the bending test according to claim 5, characterized in that, The elastic element includes two tension springs (9) fixed on the longitudinal inner wall of the included angle (102). The two tension springs (9) are arranged in a centrally symmetrical manner with the axis of the gear (7) as the center. The ends of the two tension springs (9) away from the inner wall of the included angle (102) are respectively fixed to the ends of the two racks (8).

7. The auxiliary fixture for the bending test according to claim 1, characterized in that, The centering mechanism includes a movable plate (11) symmetrically slidably installed in a groove (10) on the transverse inner wall of the included angle (102). Two centering clamps (3) are slidably connected to the upper ends of the two movable plates (11) by sliding rods. The two centering clamps (3) are located between the two movable plates (11). A second spring (12) is fixed between the centering clamp (3) on the same side and the movable plate (11). A bidirectional screw (13) is rotatably connected to the longitudinal inner wall of the included angle (102) by bearings. The two movable plates (11) are threaded to the two ends of the bidirectional screw (13) by threaded holes. A knob (14) is fixed to one end of the bidirectional screw (13).

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