CN217211898U

CN217211898U - Cantilever beam type extensometer

Info

Publication number: CN217211898U
Application number: CN202220443764.8U
Authority: CN
Inventors: 仲昕蕊
Original assignee: Shanghai Kaiwei Testing Technology Co Ltd
Current assignee: Shanghai Kaiwei Testing Technology Co Ltd
Priority date: 2022-03-02
Filing date: 2022-03-02
Publication date: 2022-08-16
Anticipated expiration: 2032-03-02

Abstract

The utility model discloses a cantilever beam formula extensometer, including the long arm, the long arm sets up in upper and lower both sides, and the relative one end of the long arm of the upper and lower side rotates respectively and is connected with U-shaped pole and T shape pole, the relative one end of U-shaped pole and T shape pole rotates to be connected, and U-shaped pole one side on the long arm of upside is provided with square support, and T shape pole one side on the long arm of downside is connected with down measures the arm, square support has last measurement arm through bolted connection, the right-hand member of going up measurement arm left end and measuring arm down all has the connection piece line ball board through bolted connection. The utility model discloses simple structure, the accuracy of extensometer sample is high, and flexible hinged joint is used for eliminating the influence that the bending moment warp between upper and lower arm, and the influence of roof beam distortion about reducing simultaneously only does not produce the influence to axial deflection, all plays the elimination to other volume, has guaranteed that cantilever beam deflection is axial deformation only, guarantees the high accuracy of extensometer output volume, and the practicality is strong, is worth using widely.

Description

Cantilever beam type extensometer

Technical Field

The utility model relates to an extensometer technical field especially relates to a cantilever beam formula extensometer.

Background

At present, various electronic tensile material testing machines at home and abroad are equipped with a clip-type electronic extensometer, and the clip-type electronic extensometer usually uses a rubber band to install two single-edge blades for sensing the extension of a sample scale distance on one side of the sample so as to detect the extension amount of the sample. The gauge length measured by such electronic extensometers is often fixed, i.e. one gauge length requires one extensometer. Due to the different elasticity of different rubber bands and the difference of different testers, the change of test results is large, the repetition precision is poor, and even the rubber bands are not usable. The chuck of the tester is inevitably eccentric, the test sample is installed and operated manually, and the test sample can be bent, which causes the eccentricity of the tensile test and causes the error of the measurement result of the test sample, so that the cantilever beam type extensometer is needed.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a cantilever beam type extensometer.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a cantilever beam type extensometer comprises a long arm, wherein the long arm is arranged at the upper side and the lower side, the opposite ends of the long arm at the upper side and the lower side are respectively and rotatably connected with a U-shaped rod and a T-shaped rod, the opposite ends of the U-shaped rod and the T-shaped rod are rotatably connected, one side of the U-shaped rod on the long arm at the upper side is provided with a square support, one side of the T-shaped rod on the long arm at the lower side is connected with a lower measuring arm, the square support is connected with an upper measuring arm through a bolt, the left end of the upper measuring arm and the right end of the lower measuring arm are both connected with connecting sheet tension plates through bolts, a cantilever beam arm is connected between the connecting sheet tension plates at the left side and the right side, the peripheries of the upper measuring arm and the lower measuring arm are provided with a shell, the long arms at the upper side and the lower side are provided with transverse grooves, the ends of the long arms at the upper side and the lower side are separated from each other and connected with a fixed plate, an upper transverse rod and a lower transverse rod are respectively arranged on the fixed plates at the upper side and the lower transverse rod, and the left end of the upper transverse rod are integrally connected with a clamping rod, the left end of the long arm is connected with a cutting edge, the right sides of the long arms at the upper side and the lower side are separated from one end and are respectively connected with an upper supporting plate and a lower supporting plate, the upper supporting plate and the lower supporting plate transversely slide to penetrate through a supporting rod, the right end of the supporting rod is connected with a spring support, and a spring is sleeved on the outer surface of the supporting rod.

Further, the upper and lower measuring arms are 'Z' -shaped plates.

Further, the middle of the end face of one side, opposite to the upper measuring arm and the lower measuring arm, of the upper measuring arm is connected with a protruding block, the protruding block is connected with a wire pressing plate through a screw, and a flexible hinge is arranged between the protruding block and the wire pressing plate.

Furthermore, a zero position pin is inserted at one opposite end of the U-shaped rod and the T-shaped rod.

Compared with the prior art, the beneficial effects of the utility model reside in that:

1. the utility model relates to a cantilever beam type extensometer, it is concrete, the back is pressed from both sides on the sample to the clamping bar among the cantilever beam type extensometer, wherein the deflection of upside long arm transmits square support and the last measuring wall that its integration is connected, the deflection of going up measuring wall transmits the one end of cantilever beam, the deflection of downside long arm transmits the lower measuring wall that its integration is connected, the deflection of measuring wall transmits the other end of cantilever beam down, the deflection of upper and lower long arm is transmitted in the cantilever beam from different directions, thereby can accurate measurement, improve the accuracy of extensometer sample;

2. the flexible hinge is arranged between the upper measuring arm and the lower measuring arm and is used for eliminating the influence of bending moment deformation, reducing the influence of distortion of the upper and lower cantilever beams, only having no influence on axial deformation and eliminating other quantities, ensuring that the cantilever beam deformation only axially deforms and ensuring the high precision of the output quantity of the extensometer;

3. the utility model provides an upper measuring arm and lower measuring arm are 'Z' shaped plate, measure the wall in both sides, and the cantilever beam is in the structural style in the middle, can enlarge the deflection of cantilever beam, write the resistance foil gage on the both sides plane of cantilever beam simultaneously, constitute Wheatstone bridge, convert the deflection into the output of electric signal, become the electric signal mechanical quantity, can satisfy the requirement of different gauge lengths;

4. the utility model provides a relative one end cartridge of U-shaped pole and T shape pole has the zero position round pin, before experimental, inserts the zero position round pin and makes the long arm of upper and lower side form the connection state, extracts out the zero position round pin after, the long arm can free activity to make the gauge length in the regulation scope, as the zero point location of deflection.

To sum up, the utility model discloses simple structure, the structure is clear and understandable, and cantilever beam formula extensometer installs behind the sample, and wherein the deflection of long arm transmits the one end of cantilever beam, and the deflection of lower arm transmits the other end of cantilever beam, transmits the deflection of upper and lower arm in the cantilever beam from different directions to measurement that can be accurate improves the accuracy of extensometer sample. The utility model discloses a flexible hinge installs the influence that is used for eliminating the bending moment and warp between upper and lower arm, and the influence of roof beam distortion about reducing simultaneously only does not exert an influence to axial deflection, all plays the elimination to other volume, has guaranteed that cantilever beam deflection is axial deformation only, guarantees the high accuracy of extensometer output quantity, and the practicality is strong, is worth using widely.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.

Fig. 1 is a schematic perspective view of a cantilever beam type extensometer according to the present invention;

fig. 2 is a schematic structural view of a cantilever beam type extensometer according to the present invention;

fig. 3 is a schematic top view of a cantilever beam type extensometer according to the present invention;

fig. 4 is a left side view structural schematic diagram of the cantilever beam type extensometer provided by the present invention.

In the figure: 1-cantilever beam, 2-flexible hinge, 3-lower measuring wall, 4-upper measuring wall, 5-line pressing plate, 6-connecting sheet line pressing plate, 7-long arm, 8-fixing plate, 9-spring support, 10-lower support plate, 11-upper support plate, 12-T-shaped rod, 13-U-shaped rod, 14-blade, 15-upper cross rod, 16-lower cross rod, 17-zero pin, 18-clamping rod, 19-spring, 20-lug, 21-square support, 22-screw, 23-shell, 24-support rod and 25-transverse groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1-4, a cantilever type extensometer comprises a long arm 7, wherein the long arm 7 is arranged at the upper side and the lower side, the opposite ends of the long arm 7 at the upper side and the lower side are respectively connected with a U-shaped rod 13 and a T-shaped rod 12 in a rotating way, the opposite ends of the U-shaped rod 13 and the T-shaped rod 12 are connected in a rotating way, a square support 21 is arranged at one side of the U-shaped rod 13 on the long arm 7 at the upper side, a lower measuring arm 3 is connected at one side of the T-shaped rod 12 on the long arm 7 at the lower side, the square support 21 is connected with an upper measuring arm 4 through a bolt, the left end of the upper measuring arm 4 and the right end of the lower measuring arm 3 are both connected with connecting sheet pressure plates 6 through bolts, a cantilever beam arm 1 is connected between the connecting sheet pressure plates 6 at the left side and the right side, a shell 23 is arranged at the periphery of the upper measuring arm 4 and the lower measuring arm 3, a transverse groove 25 is arranged on the long arm 7 at the upper side and the lower side in a penetrating way, the long arm 7 at the upper side and the lower side are connected with a fixing plate 8 at the opposite ends, an upper cross rod 15 and a lower cross rod 16 are transversely arranged on the fixing plates 8 on the upper side and the lower side in a penetrating mode respectively, a clamping rod 18 is integrally connected to the left ends of the upper cross rod 15 and the lower cross rod 16, a cutting edge 14 is connected to the left end of the long arm 7, an upper support plate 11 and a lower support plate 10 are connected to the right side of the long arm 7 on the upper side and the right side of the long arm 10 on the lower side in a separated mode respectively, a support rod 24 is arranged on the upper support plate 11 and the lower support plate 10 in a penetrating mode in a transverse sliding mode, a spring support 9 is connected to the right end of the support rod 24, and a spring 19 is sleeved on the outer surface of the support rod 24.

The utility model discloses a cantilever beam type extensometer, it is concrete, back on the sample is pressed from both sides to clamping bar 18 among the cantilever beam type extensometer, wherein the deflection of upside long arm 7 is transmitted to square support 21 that its integration is connected and is measured wall 4 on, the deflection of measuring wall 4 on transmits the one end of cantilever beam 1, the deflection of downside long arm 7 transmits the lower measurement wall 3 that its integration is connected, the deflection of measuring wall 3 down transmits the other end of cantilever beam 1, the deflection of upper and lower long arm 7 is transmitted in cantilever beam 1 from the equidirectional transmission, thereby measurement that can be accurate, the accuracy of improvement extensometer sample.

The upper measuring arm 4 and the lower measuring arm 3 are Z-shaped plates, the measuring walls are arranged on two sides, the cantilever beam 1 is arranged in the middle of the upper measuring arm and the lower measuring arm, the deformation of the cantilever beam 1 can be enlarged, meanwhile, resistance strain gauges are written on planes on two sides of the cantilever beam to form a Wheatstone bridge, the deformation is converted into an electric signal to be output, a mechanical quantity is converted into the electric signal, and the requirements of different gauge lengths can be met.

The middle of the end face of one side opposite to the upper measuring arm 4 and the lower measuring arm 3 is connected with a lug 20, the lug 20 is connected with a wire pressing plate 5 through a screw 22, and a flexible hinge 2 is arranged between the lug 20 and the wire pressing plate 5.

The utility model discloses a flexible hinge 2 installs at last measuring arm 4 and between measuring arm 3 down for eliminate the influence that the bending moment warp, the influence of 1 distortions of cantilever beam arm about reducing simultaneously, only do not produce the influence to axial deflection, all play the elimination to other volume, guaranteed that 1 deflection of cantilever beam is axial deformation only, guarantee the high accuracy of extensometer output volume.

The opposite ends of the U-shaped rod 13 and the T-shaped rod 12 are inserted with a zero pin 17, before the test, the zero pin 17 is inserted to enable the upper long arm 7 and the lower long arm 7 to form a connection state, and after the zero pin 17 is pulled out, the long arms can move freely, so that the gauge length is within a specified range and is used as zero point positioning of deformation.

The utility model discloses a theory of operation and use flow: the utility model relates to a cantilever beam extensometer, it is concrete, the back is pressed from both sides on the sample to clamping bar 18 among the cantilever beam extensometer, wherein the deflection of upside long arm 7 transmits square support 21 and upper measurement wall 4 that its integration is connected, the deflection of upper measurement wall 4 transmits the one end of cantilever beam 1, the deflection of downside long arm 7 transmits lower measurement wall 3 that its integration is connected, the deflection of lower measurement wall 3 transmits the other end of cantilever beam 1, the deflection of upper and lower long arm 7 is transmitted in cantilever beam 1 from different directions, thereby measurement that can be accurate, improve the accuracy of extensometer sample;

the utility model adopts the flexible hinge 2 which is arranged between the upper measuring arm 4 and the lower measuring arm 3 and is used for eliminating the influence of bending moment deformation, simultaneously reducing the influence of the distortion of the upper and lower cantilever beams 1, only having no influence on axial deformation and eliminating other quantities, ensuring that the deformation of the cantilever beam 1 only axially deforms and ensuring the high precision of the output quantity of the extensometer;

the utility model provides an upper measuring arm 4 and lower measuring arm 3 are 'Z' shaped plate, measure the wall in both sides, cantilever beam 1 is in the structural style in the middle, can enlarge the deflection of cantilever beam 1, write the resistance foil gage on the both sides plane of cantilever beam simultaneously, constitute Wheatstone electric bridge, convert the deflection into electric signal output, become the mechanical quantity into electric signal, can satisfy the requirement of different gauge lengths;

the utility model provides a relative one end cartridge of U-shaped pole 13 and T shape pole 12 has zero position round pin 17, before experimental, inserts zero position round pin 17 and makes the long arm 7 of upper and lower side form the connection state, extracts zero position round pin 17 back, and the long arm can free activity to make the gauge length in the regulation scope, as the zero point location of deflection.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A cantilever beam type extensometer comprises a long arm (7) and is characterized in that the long arm (7) is arranged on the upper side and the lower side, the opposite ends of the long arm (7) on the upper side and the lower side are respectively connected with a U-shaped rod (13) and a T-shaped rod (12) in a rotating manner, the opposite ends of the U-shaped rod (13) and the T-shaped rod (12) are connected in a rotating manner, one side of the U-shaped rod (13) on the long arm (7) on the upper side is provided with a square support (21), one side of the T-shaped rod (12) on the long arm (7) on the lower side is connected with a lower measuring arm (3), the square support (21) is connected with an upper measuring arm (4) through bolts, the left end of the upper measuring arm (4) and the right end of the lower measuring arm (3) are both connected with wire pressing plates (6) through bolts, a cantilever beam arm (1) is connected between the wire pressing plates (6) on the left side and the right side, and the peripheries of the upper measuring arm (4) and the lower measuring arm (3) are provided with a shell (23), cross grooves (25) penetrate through the long arms (7) on the upper side and the lower side, one ends of the long arms (7) on the upper side and the lower side are separated from each other and are connected with a fixing plate (8), an upper cross rod (15) and a lower cross rod (16) are transversely penetrated through the fixing plate (8) on the upper side and the lower side respectively, the left ends of the upper cross rod (15) and the lower cross rod (16) are integrally connected with a clamping rod (18), the left end of the long arm (7) is connected with a cutting edge (14), one ends of the right sides of the long arms (7) on the upper side and the lower side are separated from each other and are respectively connected with an upper support plate (11) and a lower support plate (10), the upper support plate (11) and the lower support plate (10) transversely slide and penetrate through a support rod (24), the right end of the support rod (24) is connected with a spring support (9), and a spring (19) is sleeved on the outer surface of the support rod (24).

2. Cantilever beam extensometer according to claim 1, characterized in that the upper measuring arm (4) and the lower measuring arm (3) are 'Z' -shaped plates.

3. The cantilever beam extensometer according to claim 2, characterized in that a bump (20) is connected in the middle of the end surface of the upper measuring arm (4) and the lower measuring arm (3) on the opposite side, the bump (20) is connected with a tension disc (5) through a screw (22), and a flexible hinge (2) is arranged between the bump (20) and the tension disc (5).

4. An arm-beam extensometer according to claim 3, characterized in that the zero position pin (17) is inserted at the opposite ends of the U-shaped bar (13) and the T-shaped bar (12).