A bending mechanism of a compression and bending strength testing machine

Abstract

This utility model discloses a flexural strength testing machine, including a flexural clamping mechanism comprising a clamping base, a movable column, and a pressure block installed inside the clamping base and fixedly connected to the movable column, with a positioning rod connected to the opposite surface of the pressure block; a base for placing the specimen, comprising a combined pad and a limiting block, with a protrusion on the bottom surface of the limiting block; and a limiting component comprising a vertical rod inserted into the pad, a connecting frame fixedly connected to the top of the vertical rod, a handwheel adjusting screw, a slider located inside the connecting frame and sleeved on the outside of the handwheel adjusting screw, and a fixing plate connected at one end to the slider; in this utility model, the spacing between the opposing positioning plates is changed by the designed limiting component and the combined base, making it suitable for specimens of different sizes. The designed protective shell provides protection, preventing fragments of the crushed or broken specimen from flying and causing injury.

Description

Technical Field

[0001] This utility model belongs to the technical field of compressive and flexural strength testing machines, specifically relating to a flexural mechanism of a compressive and flexural strength testing machine. Background Technology

[0002] A compressive and flexural strength testing machine is a mechanical device used to test the compressive and flexural strength of specimens. It typically applies pressure or torque to the specimen through a hydraulic system, measuring the specimen's performance under pressure or bending force. When the specimen breaks under pressure or torque, reaching a specified failure standard, the compressive and flexural strength data can be obtained. The flexural clamp used to fix the specimen on the machine is called a flexural clamp. The flexural clamp mainly includes a support bracket, a lower pressure bar, and a pressure block. When standard, regularly arranged specimens are placed, the specimens can be made of plastic, wood, concrete, etc. The specimen is placed inside the support bracket, and the pressure block presses down on the top surface of the specimen. When the machine is started, the hydraulic cylinder assembly acts on the lower pressure bar, which presses down on the pressure block, causing deformation and thus testing the specimen's compressive and flexural strength.

[0003] When the specimen is placed on the support bracket of the bending fixture, a positioning pin is usually welded on the inner surface of the support bracket to position the specimen. However, the position of the positioning pin is fixed and cannot be adapted to specimens of different sizes. It cannot be adjusted according to the different sizes of specimens, which is a shortcoming.

[0004] Existing flexural clamps for fixing specimens lack a positioning design that allows for adjustment of the position based on the specimen's dimensions. To address this, this application proposes a flexural mechanism for a compressive and flexural strength testing machine. Utility Model Content

[0005] The purpose of this invention is to provide a bending mechanism for a compressive and flexural strength testing machine, so as to solve the problem mentioned in the background art that the bending clamp cannot be adjusted to position the specimens of different sizes.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a flexural mechanism for a compressive and flexural strength testing machine, comprising...

[0007] The anti-bending clamping mechanism includes a clamping base, a movable column, and a pressure block installed inside the clamping base and fixedly connected to the movable column. A positioning rod is connected to the opposite surface of the pressure block.

[0008] A base for placing specimens includes a modular pad and a limiting block, the bottom surface of which is provided with protrusions;

[0009] The defined components include a vertical rod inserted into the pad block, a connecting frame fixedly connected to the top of the vertical rod, a handwheel adjusting screw, a slider located inside the connecting frame and sleeved on the outside of the handwheel adjusting screw, a fixing plate with one end connected to the slider, a stabilizing plate fixedly connected to the fixing plate, and a positioning plate for the vertical stabilizing plate.

[0010] A protective shell is fitted onto the outside of the fixture seat, and a connecting plate is provided on the protective shell.

[0011] Preferably, the bottom surface of the pad is surface e1, the opposite surface of the pad is surface e2, and the inner surface of the clamp seat is in contact with surface e1 and surface e2.

[0012] Preferably, the pad has a placement groove a at its center and an installation groove that mates with the limiting block on its side, and the installation groove is connected to the placement groove a.

[0013] Preferably, the pad has a recessed groove d on the surface of the mounting groove, and the protrusion engages with the groove d.

[0014] Preferably, the upright is a three-dimensional structure of a square rod, the surface of the pad has a square groove c that corresponds to and matches the upright, and the limiting block has a specimen groove b whose orthographic projection is rectangular.

[0015] Preferably, the clamp base is a cuboid frame structure, the distance between the diagonal edges of the clamp base is the spacing H, and the inner diameter of the protective shell is 5 mm larger than the spacing H.

[0016] Preferably, the connecting plate is arc-shaped, the inner diameter of the protective shell and the connecting plate is the same, and a concave annular groove is formed on the inner surface of the protective shell and the connecting plate, with one end of the positioning rod located in the annular groove.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. In this utility model, by designing limiting components and a modular base, the spacing between opposing positioning plates is changed to make it suitable for specimens of different sizes.

[0019] 2. In this utility model, the designed protective shell serves a protective function, preventing fragments of the crushed or broken specimen from flying away and causing injury. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a front view schematic diagram of the anti-bending clamp mechanism of this utility model;

[0022] Figure 3For the present utility model Figure 2 Enlarged structural diagram of section B in the middle;

[0023] Figure 4 This is a three-dimensional structural diagram of the clamp holder of this utility model;

[0024] Figure 5 This is a three-dimensional structural diagram of the pad block of this utility model;

[0025] Figure 6 This is a three-dimensional structural diagram of the protective shell of this utility model;

[0026] In the diagram: 1. Anti-bending clamp mechanism; 2. Pad block; 3. Limiting block; 4. Upright pole; 5. Protective shell; 6. Connecting plate; 9. Ring groove; 11. Clamp seat; 12. Moving column; 13. Pressure block; 31. Protrusion; 71. Stabilizing plate; 72. Positioning plate; 81. Connecting frame; 82. Handwheel adjusting screw; 83. Slider; 84. Fixing plate; 131. Positioning rod. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figures 1 to 6 This utility model provides a technical solution: a flexural mechanism for a compressive and flexural strength testing machine, including a flexural clamping mechanism 1, comprising a clamping base 11, a movable column 12, and a pressure block 13 installed inside the clamping base 11 and fixedly connected to the movable column 12. When in use, the flexural clamping mechanism 1 is placed on the workstation of the compressive and flexural strength testing machine, and the specimen is... Figure 1 and Figure 2In the first part, specimen A is placed in the fixture seat 11 and on the pad 2. The pressure block 13 presses down on the top surface of specimen A to prevent specimen A from shaking or tilting. A positioning rod 131 is connected to the opposite surface of the pressure block 13. The positioning rod 131 is fixed to the pressure block 13 by screws. The positioning rod 131 serves to limit the protective shell 5. The base for placing the specimen includes a combined pad 2 and a limiting block 3. The pad 2 and the limiting block 3 are of a separate structure. The limiting block 3 is detachable. According to the size of specimen A, the limiting block 3 of the corresponding size can be replaced. The bottom surface of the limiting block 3 is provided with a protrusion 31. The protrusion 31 is inserted into the interior of the pad 2. The pad 2 and the limiting block 3 are accurately and stably connected. The limiting component includes a vertical rod 4 inserted into the interior of the pad 2, a connecting frame 81 fixedly connected to the top of the vertical rod 4, a handwheel adjusting screw 82, and a screw located in the connecting frame 81 and sleeved on the handwheel. The slider 83 on the outside of the adjusting screw 82, the fixed plate 84 connected to the slider 83 at one end, the stabilizing plate 71 fixedly connected to the fixed plate 84, and the positioning plate 72 vertically connected to the stabilizing plate 71 are used to position the specimen A. The upright 4 is inserted into the pad 2, and the handwheel adjusting screw 82 is rotated to make the slider 83, the fixed plate 84, the stabilizing plate 71, and the positioning plate 72 move in the same direction, thereby changing the distance between the opposing positioning plates 72. This achieves the function of positioning specimens A of different sizes. When the distance between the opposing positioning plates 72 increases, it can be used for wide specimens A. When the distance between the opposing positioning plates 72 decreases, it can be used for narrow specimens A. The protective shell 5 is sleeved on the outside of the clamp seat 11. The protective shell 5 is provided with a connecting plate 6. The protective shell 5 is installed on the outside of the clamp seat 11 and plays a protective role to prevent the fragments of the crushed or broken specimen from flying and injuring people.

[0029] In this embodiment, the bottom surface of the pad 2 is surface e1, the opposite surface of the pad 2 is surface e2, the inner surface of the clamp seat 11 is in contact with surface e1 and surface e2, the pad 2 and the clamp seat 11 are in surface contact, the contact area is large, and the pad 2 and the clamp seat 11 are fixed by screws.

[0030] In this embodiment, a placement groove a is provided at the center of the pad block 2, and an installation groove that mates with the limiting block 3 is provided on the side of the pad block 2. The installation groove is connected to the placement groove a. A recessed slot d is provided on the surface of the pad block 2 located in the installation groove. The protrusion 31 mates with the slot d. The pad block 2 and the limiting block 3 are separate structures. The limiting block 3 is detachable. The limiting block 3 of the corresponding size can be replaced according to the size of the specimen A.

[0031] In this embodiment, the upright 4 is a three-dimensional structure of a square rod, and the surface of the pad 2 is provided with a square groove c that corresponds to and matches the upright 4. The limiting block 3 is provided with a specimen groove b whose orthographic projection is rectangular. When the specimen A is placed vertically, the bottom end of the specimen A is located in the square groove c. When the specimen A is placed horizontally, the specimen A is located in the specimen groove b. It can be used for the compressive and flexural strength tests of the specimen A.

[0032] In this embodiment, the clamp seat 11 is a cuboid frame structure. The distance between the diagonal edges of the clamp seat 11 is the spacing H. The inner diameter of the protective shell 5 is 5 mm larger than the spacing H. The inner diameters of the protective shell 5 and the connecting plate 6 are larger than the oblique line of the clamp seat 11. The clamp seat 11 does not affect the rotation of the protective shell 5 and the connecting plate 6, but can change the angle of the protective shell 5.

[0033] In this embodiment, the connecting plate 6 is arc-shaped, the inner diameters of the protective shell 5 and the connecting plate 6 are the same, and the inner surfaces of the protective shell 5 and the connecting plate 6 are provided with concave annular grooves 9. One end of the positioning rod 131 is located in the annular groove 9, and the protective shell 5 and the connecting plate 6 are limited by the positioning rod 131 to prevent the protective shell 5 and the connecting plate 6 from falling off.

[0034] Working principle and usage process of this utility model:

[0035] When specimen A is installed vertically, rotate the handwheel adjusting screw 82 to make the slider 83, the fixing plate 84, the stabilizing plate 71 and the positioning plate 72 move in the same direction, thereby changing the distance between the opposing positioning plates 72, so as to achieve the function of positioning specimen A of different sizes.

[0036] When the distance between the opposing positioning plates 72 increases, it can be used for wide specimen A; when the distance between the opposing positioning plates 72 decreases, it can be used for narrow specimen A. The bottom of specimen A is inserted into the interior of pad 2.

[0037] Adjust the spacing between the opposing positioning plates 72 according to the size of specimen A, so that the spacing is slightly larger than the size of specimen A;

[0038] Specimen A is placed vertically between pad 2 and pressure block 13. After specimen A is placed, the handwheel adjusting screw 82 is finely adjusted so that the positioning plate 72 restricts specimen A.

[0039] The moving column 12 moves down, the pressure block 13 and the protective shell 5 move down, and the pressure block 13 presses down on the specimen A;

[0040] Fine-tune the handwheel adjusting screw 82 to move the positioning plate 72 away from the specimen A;

[0041] The protective shell 5 and the connecting plate 6 are rotated. The protective shell 5 and the connecting plate 6 are limited by the positioning rod 131 and will not fall off. The angle of the protective shell 5 and the connecting plate 6 is changed. The protective shell 5 plays a protective role and prevents the fragments of the crushed or broken specimen from flying away and causing injury.

[0042] In summary, the anti-bending clamp tool proposed in this application has the function of adjusting the positioning position to facilitate the positioning of specimens of different sizes. Through the designed limiting components and the combined base, the distance between the opposing positioning plates 72 can be changed to suit specimens of different sizes. The protective shell 5 plays a protective role to prevent the fragments of the crushed or broken specimen from flying away and causing injury.

[0043] 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. A flexural strength testing machine, characterized in that: include The anti-bending clamp mechanism (1) includes a clamp base (11), a moving column (12), and a pressure block (13) installed inside the clamp base (11) and fixedly connected to the moving column (12). A positioning rod (131) is connected to the opposite surface of the pressure block (13). The base for placing the specimen includes a combination pad (2) and a limiting block (3), the bottom surface of which is provided with a protrusion (31); The limiting components include a vertical rod (4) inserted into the pad (2), a connecting frame (81) fixedly connected to the top of the vertical rod (4), a handwheel adjusting screw (82), a slider (83) located inside the connecting frame (81) and sleeved on the outside of the handwheel adjusting screw (82), a fixing plate (84) with one end connected to the slider (83), a stabilizing plate (71) fixedly connected to the fixing plate (84), and a positioning plate (72) for the vertical stabilizing plate (71); A protective shell (5) is fitted on the outside of the clamp seat (11), and a connecting plate (6) is provided on the protective shell (5).

2. The flexural mechanism of the compressive and flexural strength testing machine according to claim 1, characterized in that: The bottom surface of the pad (2) is surface e1, the opposite surface of the pad (2) is surface e2, and the inner surface of the clamp seat (11) is in contact with surface e1 and surface e2.

3. The flexural mechanism of the compressive and flexural strength testing machine according to claim 1, characterized in that: The pad (2) has a placement groove a at its center and an installation groove that mates with the limiting block (3) on its side. The installation groove is connected to the placement groove a.

4. The flexural mechanism of the compressive and flexural strength testing machine according to claim 3, characterized in that: The pad (2) has a recessed groove d on the surface of the mounting groove, and the protrusion (31) cooperates with the groove d.

5. The flexural mechanism of the compressive and flexural strength testing machine according to claim 1, characterized in that: The upright (4) is a three-dimensional structure of a square rod. The surface of the pad (2) is provided with a square groove c that corresponds to and matches the upright (4). The limiting block (3) is provided with a specimen groove b whose orthographic projection is rectangular.

6. The flexural mechanism of the compressive and flexural strength testing machine according to claim 1, characterized in that: The clamp seat (11) is a rectangular frame structure. The distance between the diagonal edges of the clamp seat (11) is the spacing H. The inner diameter of the protective shell (5) is 5 mm larger than the spacing H.

7. The flexural mechanism of the compressive and flexural strength testing machine according to claim 1, characterized in that: The connecting plate (6) is arc-shaped. The inner diameters of the protective shell (5) and the connecting plate (6) are the same. The inner surfaces of the protective shell (5) and the connecting plate (6) are provided with concave annular grooves (9). One end of the positioning rod (131) is located in the annular groove (9).

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