CN210720002U - Test instrument for three-point bending strength test - Google Patents
Test instrument for three-point bending strength test Download PDFInfo
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- CN210720002U CN210720002U CN201921690865.XU CN201921690865U CN210720002U CN 210720002 U CN210720002 U CN 210720002U CN 201921690865 U CN201921690865 U CN 201921690865U CN 210720002 U CN210720002 U CN 210720002U
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- connecting piece
- bending strength
- punch
- fixedly connected
- point bending
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Abstract
The utility model belongs to the technical field of test instruments, and provides a test instrument for three-point bending strength test, which comprises a bracket, a loading mechanism, a force application cylinder and a punch; the bracket comprises a base and a vertical arm, and the vertical arm is fixedly connected to the base; the loading mechanism is fixedly arranged above the base, a first loading tooth and a second loading tooth are arranged on the top surface of the loading mechanism, and an accommodating space is arranged between the first loading tooth and the second loading tooth; the force application cylinder is fixedly connected to the vertical arm, one end of the punch is fixedly connected to the movable end of the force application cylinder, and the punch is arranged right above the accommodating space; the force application cylinder is connected with a compressed air source through an air pipe, and a pressure-adjustable barometer is arranged on the air pipe. The utility model relates to a rationally, convenient operation can directly calculate bending strength and bending deformation according to reading data.
Description
Technical Field
The utility model belongs to the technical field of test instrument, in particular to test instrument for three point bending strength tests.
Background
The bending strength refers to the capability of the material to resist bending without breaking, is mainly used for investigating the strength of the brittle material, and is generally evaluated by adopting a three-point bending test or a four-point test method, wherein the four-point test has two loading forces and is relatively complex, the three-point test is most commonly used, and the value of the three-point bending strength is in direct proportion to the maximum pressure to be born. The bending strength testing machine commonly used in the prior art is inconvenient for rapid test of the bending strength on a production site due to the complex structure and process, high price and large equipment volume.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a simple structure, convenient operation, portable's a test instrument that is used for three point bending strength to improve the test efficiency of three point bending strength test.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a test instrument for testing three-point bending strength comprises a support, a loading mechanism, a force application cylinder and a punch;
the bracket comprises a base and a vertical arm, and the vertical arm is fixedly connected to the base;
the loading mechanism is fixedly arranged above the base, a first loading tooth and a second loading tooth are arranged on the top surface of the loading mechanism, and an accommodating space is arranged between the first loading tooth and the second loading tooth; the force application cylinder is fixedly connected to the vertical arm, one end of the punch is fixedly connected to the movable end of the force application cylinder, and the punch is arranged right above the accommodating space;
the force application cylinder is connected with a compressed air source through an air pipe, and a pressure-adjustable air pressure meter is arranged on the air pipe.
The punch is fixedly provided with a limiting sleeve, and the distance between the bottom surface of the limiting sleeve and the bottom end of the punch is smaller than the depth of the accommodating space.
The bottom end of the punch is provided with a tip end, and the tops of the first load tooth and the second load tooth are in a pointed shape.
The test instrument for testing the three-point bending strength further comprises a first connecting piece, a second connecting piece and a third connecting piece, wherein the first connecting piece is fixedly arranged on the vertical arm; and one ends of the second connecting piece and the third connecting piece are respectively and fixedly connected with two ends of the fixing part of the force application cylinder, and the other ends of the second connecting piece and the third connecting piece are respectively and fixedly connected with the upper end and the lower end of the first connecting piece.
The first connecting piece is provided with a first vertical groove, a second vertical groove, a third vertical groove and a fourth vertical groove, and the second connecting piece is fixedly connected to the first connecting piece through the first vertical groove and the third vertical groove; the third connecting piece is fixedly connected to the first connecting piece through the second vertical groove and the fourth vertical groove; the loading mechanism is provided with a bolt groove, and the loading mechanism is fixedly arranged on the base through a bolt arranged in the bolt groove.
And scales are arranged on the first load tooth or the second load tooth.
The air pipe is also provided with a valve for closing the compressed air source.
Compared with the prior art, the utility model following beneficial effect has: the utility model discloses a test device uses compressed air as the power supply according to three point test bending strength's principle design, reasonable in design, convenient operation, the low price, portable can directly calculate bending strength and bending deformation according to reading data, can be used to the detection of materials such as plastics, non-metallic material.
Drawings
Fig. 1 is a schematic overall structure diagram of a testing apparatus for three-point bending strength testing according to an embodiment of the present invention;
fig. 2 is a right side view of a first connecting member in a testing apparatus for three-point bending strength testing according to an embodiment of the present invention;
fig. 3 is a top view of a loading mechanism of a testing apparatus for three-point bending strength testing according to an embodiment of the present invention.
Wherein, 1 is the support, 2 is loading mechanism, 3 is application of force cylinder, 4 is the drift, 5 is the base, 6 is vertical arm, 7 is first load tooth, 8 is second load tooth, 9 is the accommodation space, 10 is the barometer of adjustable pressure, 11 is the stop collar, 12 is most advanced, 13 is first connecting piece, 14 is the second connecting piece, 15 is the third connecting piece, 16 is the valve, 17 is the trachea, 18 is the bolt groove, 13a is first vertical groove, 13b is the vertical groove of second, 13c is the vertical groove of third, 13d is the vertical groove of fourth.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments and accompanying drawings, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention; based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1 to 3, an embodiment of the present invention provides a testing apparatus for three-point bending strength testing, including a bracket 1, a loading mechanism 2, a force application cylinder 3 and a punch 4; the support 1 comprises a base 5 and a vertical arm 6, and the vertical arm 6 is fixedly connected to the base 5; the loading mechanism 2 is fixedly arranged above the base 5 through a fixing bolt, a first load tooth 7 and a second load tooth 8 are arranged on the top surface of the loading mechanism 2, and an accommodating space 9 is arranged between the first load tooth 7 and the second load tooth 8; the force application cylinder 3 is fixedly connected to the vertical arm 6, one end of the punch 4 is fixedly connected to the movable end of the force application cylinder 3, and the punch 4 is arranged right above the accommodating space 9; the force application cylinder 3 is connected with a compressed air source through an air pipe 17, and the air pipe 17 is provided with a pressure-adjustable air gauge 10. The pressure-adjustable barometer 10 can adjust the air pressure added to the force application cylinder so as to change the punching force of the punch fixed on the force application cylinder, and the pressure-adjustable barometer 10 requires that the air pressure display precision is over 0.02 MPa.
Specifically, in this embodiment, the punch 4 is fixedly provided with a limiting sleeve 11, and a distance between a bottom surface of the limiting sleeve 11 and a bottom end of the punch 4 is smaller than a depth of the accommodating space 9. The stop collar can carry on spacingly to drift 4, avoid the drift to dash to lead to the fact the destruction with 2 collisions of loading mechanism when reaching the bottom.
Specifically, in the present embodiment, the bottom end of the punch 4 is provided with a tip 12, and the tops of the first load tooth 7 and the second load tooth 8 are pointed. The tip 12 of the bottom end of the punch 4 and the top tips of the first load tooth 7 and the second load tooth 8 form a three-point bending strength test stress point, and the three-point bending strength test of the sample can be realized.
Specifically, as shown in fig. 1, the testing apparatus for three-point bending strength testing provided in this embodiment further includes a first connecting member 13, a second connecting member 14, and a third connecting member 15, where the first connecting member 13 is fixedly disposed on the vertical arm 6; one end of the second connecting piece 14 and one end of the third connecting piece 15 are respectively fixedly connected with two ends of the fixing part of the force application cylinder 3, and the other ends of the second connecting piece and the third connecting piece are respectively fixedly connected with the upper end and the lower end of the first connecting piece 13. The first connecting piece is connected with the vertical arm 6 through bolts, the second connecting piece 14, the third connecting piece 15 and the first connecting piece 13 are connected through bolts, and the other ends of the first connecting piece 13 and the third connecting piece are connected with the force application cylinder through bolts. The force application cylinder is arranged on the support through the connecting pieces, the stability of the structure can be improved, in addition, the height of the cylinder can be adjusted conveniently aiming at different test tests, or the cylinders of different models can be replaced, so that the test of different materials can be met. Specifically, as shown in fig. 2, in this embodiment, a first vertical groove 13a, a second vertical groove 13b, a third vertical groove 13c, and a fourth vertical groove 13d are formed in the first connecting member 13, and the second connecting member 14 is fixedly connected to the first connecting member 13 through the first vertical groove 13a and the third vertical groove 13 c; the third connecting member 15 is fixedly connected to the first connecting member 13 through the second vertical groove 13b and the fourth vertical groove 13 d. The setting of vertical groove on the first connecting piece is favorable to adjusting the height of second connecting piece and third connecting piece to in the height of adjustment cylinder, perhaps change the cylinder of different models.
Specifically, in this embodiment, the first load tooth 7 or the second load tooth 8 is provided with a scale for reading the deformation of the sample.
Specifically, in this embodiment, the air pipe 17 is further provided with a valve 16 for closing the compressed air source to control the lifting of the air cylinder.
Specifically, in the present embodiment, the height of the first load tooth 7 and the second load tooth 8 on the loading mechanism 2 is 15mm, the gap between the two clamps is 10mm, as shown in fig. 3, 4 bolt slots 18 are symmetrically arranged on the upper surface of the loading mechanism 2, four fixing bolts pass through the bolt slots 18 on the loading mechanism 2 and are arranged in the bolt holes in the base 5, so as to firmly fix the loading mechanism 2 on the base 5, and furthermore, the center lines of the first load tooth and the second load tooth are on the same straight line with the center line of the punch 4.
Furthermore, the embodiment of the utility model provides a three point bending strength test's test instrument, its testing process specifically includes following step:
s1, measuring and recording the width and the thickness of the sample;
s2, reducing the pressure of the pressure-adjustable barometer 10 to about 0.05MPa, and placing the sample on the first load tooth 7 and the second load tooth 8 on the loading mechanism 2;
s3, starting the force application cylinder 3 to punch the punch 4 on the sample, slowly adjusting the pressure-adjustable barometer 10 to gradually increase the pressure until the sample is destroyed, and recording the air pressure value of the pressure-adjustable barometer 10 when the sample is destroyed; wherein, the whole process that the punch 4 punches the sample can be recorded by video to read out the deformation amount of the sample.
S4, calculating the static bending strength by the air pressure value. Wherein, the calculation formula of the static bending strength R is as follows:
R＝(3*0.85*π*P*r2*L)/(2b*h2)； (1)
where P denotes a reading of the pressure-adjustable gas gauge 10 at the time of sample breakage in MPa, r denotes an inner diameter of the urging cylinder 3 in mm, L denotes a span between the first load tooth 7 and the second load tooth 8 on the loading mechanism 2 in mm, b denotes a sample width in mm, and h denotes a sample thickness in mm.
The utility model provides a test instrument for three point bending strength test, it is according to three point test bending strength's principle design, simple structure, convenient operation can directly calculate bending strength and bending deformation according to reading data after editing the formula with EXCEL, can be used to the detection of materials such as plastics, non-metallic material, is applicable to the short-term test of laboratory and production line sample.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (7)
1. A test instrument for testing three-point bending strength is characterized by comprising a bracket (1), a loading mechanism (2), a force application cylinder (3) and a punch (4);
the support (1) comprises a base (5) and a vertical arm (6), and the vertical arm (6) is fixedly connected to the base (5);
the loading mechanism (2) is fixedly arranged above the base (5), a first load tooth (7) and a second load tooth (8) are arranged on the top surface of the loading mechanism (2), and an accommodating space (9) is arranged between the first load tooth (7) and the second load tooth (8); the force application cylinder (3) is fixedly connected to the vertical arm (6), one end of the punch (4) is fixedly connected to the movable end of the force application cylinder (3), and the punch (4) is arranged right above the accommodating space (9);
the force application cylinder (3) is connected with a compressed air source through an air pipe (17), and the air pipe (17) is provided with a pressure-adjustable air pressure gauge (10).
2. The testing instrument for the three-point bending strength test according to claim 1, characterized in that a limiting sleeve (11) is fixedly arranged on the punch (4), and the distance between the bottom surface of the limiting sleeve (11) and the bottom end of the punch (4) is smaller than the depth of the accommodating space (9).
3. Tester for three-point bending strength testing according to claim 1, characterized in that the bottom end of the punch (4) is provided with a tip (12), the top of the first (7) and second (8) load teeth being pointed.
4. The test instrument for three-point bending strength testing according to claim 1, further comprising a first connector (13), a second connector (14) and a third connector (15), the first connector (13) being fixedly arranged on the vertical arm (6); one end of the second connecting piece (14) and one end of the third connecting piece (15) are respectively fixedly connected with two ends of the fixing part of the force application cylinder (3), and the other ends of the second connecting piece and the third connecting piece are respectively fixedly connected with the upper end and the lower end of the first connecting piece (13).
5. Test instrument for three-point bending strength testing according to claim 4, characterized in that said first connector (13) is provided with a first vertical slot (13a), a second vertical slot (13b), a third vertical slot (13c) and a fourth vertical slot (13 d);
the second connecting piece (14) is fixedly connected to the first connecting piece (13) through the first vertical groove (13a) and the third vertical groove (13 c);
the third connecting piece (15) is fixedly connected to the first connecting piece (13) through the second vertical groove (13b) and the fourth vertical groove (13 d);
the loading mechanism (2) is provided with a bolt groove (18), and the loading mechanism (2) is fixedly arranged on the base (5) through a bolt arranged in the bolt groove (18).
6. Tester for three-point bending strength testing according to claim 1, characterized in that the first load tooth (7) or the second load tooth (8) is provided with a scale.
7. Test instrument for three-point bending strength testing according to claim 1, characterized in that a valve (16) is also provided on the air tube (17) for closing the compressed air source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921690865.XU CN210720002U (en) | 2019-10-11 | 2019-10-11 | Test instrument for three-point bending strength test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921690865.XU CN210720002U (en) | 2019-10-11 | 2019-10-11 | Test instrument for three-point bending strength test |
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| Publication Number | Publication Date |
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| CN210720002U true CN210720002U (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921690865.XU Active CN210720002U (en) | 2019-10-11 | 2019-10-11 | Test instrument for three-point bending strength test |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579409A (en) * | 2019-10-11 | 2019-12-17 | 青岛维思顿智能新材料有限公司 | Test instrument and test method for three-point bending strength test |
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2019
- 2019-10-11 CN CN201921690865.XU patent/CN210720002U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579409A (en) * | 2019-10-11 | 2019-12-17 | 青岛维思顿智能新材料有限公司 | Test instrument and test method for three-point bending strength test |
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