CN111413215B - Drum brake piece shear test device - Google Patents
Drum brake piece shear test device Download PDFInfo
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- CN111413215B CN111413215B CN202010150880.6A CN202010150880A CN111413215B CN 111413215 B CN111413215 B CN 111413215B CN 202010150880 A CN202010150880 A CN 202010150880A CN 111413215 B CN111413215 B CN 111413215B
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- arc
- pressing sheet
- shearing
- drum brake
- test device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
Abstract
The invention discloses a drum brake block shearing test device, which comprises: a lower bearing plate; the upper pressure plate is arranged over the lower bearing plate in an opposite way and can axially translate under the drive of an external power source; the clamping components are connected to the lower bearing disc in a rotation stopping matching mode and used for clamping an object to be detected, wherein a base body of the object to be detected is positioned between the clamping components, and an outer arc surface of the object to be detected protrudes out of the side wall of the clamping components; the shearing knife is connected with the upper pressure plate, the shearing surface of the shearing knife is attached to the side wall of the clamping assembly, and the shearing knife can synchronously move downwards along with the upper pressure plate to shear the outer arc surface of the object to be measured; the upper pressure plate, the clamping assembly and the lower bearing plate are coaxially arranged from top to bottom. The invention can be suitable for drum brake pads with different specifications and models; the one-time processing and the overlapping use can be realized, the processing efficiency is high, and the concentricity of the upper pressing sheet and the lower pressing sheet is effectively ensured; the displacement phenomenon in the test process is eliminated, the concentricity of the lower pressing sheet and the lower bearing disc is ensured, and the shearing surface strength is high.
Description
Technical Field
The invention belongs to the field of drum brake pad performance testing devices, and particularly relates to a drum brake pad shearing testing device.
Background
The brake pad bonding strength shear test is an important performance item for checking the bonding strength of the brake pad, is an important part for ensuring good brake performance, and does not have an effectively applicable and universal shearing tool in the market at present. The shearing test of the brake pad is difficult, or the design of the clamp cannot meet the shearing requirement, so that the test data deviation is caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the drum brake pad shearing test device which is high in universality, meets the shearing requirement, is suitable and efficient for a shearing tool, and is high in test efficiency and low in test cost.
The technical scheme adopted by the invention for solving the technical problem is as follows: a drum brake pad shear test device, comprising:
a lower bearing plate;
the upper pressure plate is arranged over the lower bearing plate in an opposite way and can axially translate under the drive of an external power source;
the clamping assembly is connected to the lower bearing disc in a rotation stopping matching mode and used for clamping an object to be detected, a base body of the object to be detected is positioned between the clamping assemblies, and an outer arc surface of the object to be detected protrudes out of the side wall of the clamping assembly;
the shearing knife is connected with the upper pressure plate, the shearing surface of the shearing knife is attached to the side wall of the clamping assembly, and the shearing knife can synchronously move downwards along with the upper pressure plate to shear the outer arc surface of the object to be measured;
the upper pressure plate, the clamping assembly and the lower bearing plate are coaxially arranged from top to bottom.
Furthermore, the clamping assembly comprises an upper pressing sheet, a lower pressing sheet which is positioned right below the upper pressing sheet and is coaxially arranged with the upper pressing sheet, and a connecting piece which is used for axially connecting the upper pressing sheet and the lower pressing sheet, wherein a lower convex part which can be in rotation stopping matching connection with the lower bearing disc is formed on the lower pressing sheet.
Furthermore, the upper pressing sheet and the lower pressing sheet are formed by half-and-half sectioning of a step cylindrical part, and through holes and threaded holes are symmetrically formed in the step cylindrical part. The step cylinder spare is to the assembly of the design processing of being convenient for and later stage of cuing open, and the concentricity can effectively be guaranteed in the stack use.
Furthermore, a semicircular through groove matched with the lower convex part is formed in the lower bearing disc. The lower convex part ensures that the lower pressing sheet is connected with the lower bearing plate in a rotation stopping matching manner, and the structure is simple and the processing is convenient.
Further, bear the dish down including coaxial upper part body and the lower part body that sets up, the lower part body is the cylindricality structure that the external diameter is less than the upper part body, logical groove runs through upper part body and lower part body.
Furthermore, the step thickness of the step cylindrical part is equivalent to the width of the base body of the object to be measured.
Furthermore, at least one group of arc-shaped grooves which are concentrically arranged with the upper pressure plate are formed on the upper pressure plate along the circumferential direction, and the shearing knife is connected with the arc-shaped grooves through fasteners.
Further, the width of the arc-shaped groove is larger than the outer diameter of the fastener passing through the part of the arc-shaped groove.
Furthermore, the fastener includes first fastener and second fastener, a set of arc wall includes first arc wall and second arc wall, and first fastener passes first arc wall and links to each other with shearing the sword, and the second fastener passes second arc wall and links to each other with shearing the sword.
Furthermore, the outer side surface of the shearing knife is of a rectangular structure, the shearing surface is of an arc surface structure, and the radian of the shearing surface is the same as that of the bonding surface of the base body and the outer arc surface. The shearing force of the shearing knife is large, and the strength is high.
According to the invention, the drum brake pad is conveniently connected and installed through manual operation, the clamping assembly provided with the drum brake pad is installed on the lower bearing disc, the shearing test of the brake pad of the drum brake pad is realized through the tension and compression testing machine, the shearing surface of the shearing knife is consistent with the radius of the outer arc surface of the drum brake pad, the rapid shearing test is realized, and the drum brake pad shearing testing device is a novel drum brake pad shearing testing device.
The invention has the beneficial effects that: 1) The universal brake pad has universality and can adapt to drum brake pads of different specifications and models; 2) The upper pressing sheet and the lower pressing sheet are formed by cutting a step cylindrical part, so that one-time processing is convenient to realize, the upper pressing sheet and the lower pressing sheet are overlapped for use, the processing efficiency is high, and the concentricity of the upper pressing sheet and the lower pressing sheet can be effectively ensured; 3) The lower pressure plate is arranged on the lower bearing plate, so that positioning and shearing are realized, the displacement phenomenon in the test process is eliminated, and the concentricity of the lower pressure plate and the lower bearing plate is ensured; 4) The clamping assembly stably clamps the object to be measured, so that the stability and the accuracy of subsequent shearing are ensured; 5) The shearing knife is arranged on the upper pressure plate, the gap adjustment of the shearing position is realized when the arc-shaped groove is convenient to design, and the shearing test of the bonding strength of the brake pad is realized after the position of the shearing knife is adjusted; 6) The shearing surface of the shearing knife is of an inner arc surface structure on the rectangular body, so that the fixed installation is facilitated, and the shearing surface strength is improved; 7) The upper part of the upper pressure plate is connected with a tension and compression testing machine, and the upper pressure plate has the functions of positioning, bearing and pressure conducting.
Drawings
Fig. 1 is a first perspective view of the present invention.
Fig. 2 is a second perspective view of the present invention.
Fig. 3 is a front view of the present invention.
Fig. 4 is a side view of the present invention.
Fig. 5 is a top view of the present invention.
Fig. 6 is a front view of a lower carrier platter according to the present invention.
FIG. 7 is a top view of a lower carrier platter of the present invention.
Fig. 8 is a cross-sectional view of a lower carrier platter of the present invention.
Fig. 9 is a schematic view of the mating structure of the lower carrier platter and the clamping assembly of the present invention.
Fig. 10 is a perspective view of the clamping assembly of the present invention.
Fig. 11 is a perspective view of a lower press sheet of the present invention.
Fig. 12 is a perspective view of a stepped cylindrical member of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 12, a drum brake pad shear test device includes a lower carrier plate 1, a clamping assembly 3 for clamping an object 4 to be tested, a shear knife 5 connected to an upper pressure plate 2, and an upper pressure plate 2, wherein the upper pressure plate 2, the clamping assembly 3, and the lower carrier plate 1 are coaxially arranged up and down, that is, the center of the lower carrier plate 1, the center of the clamping assembly 3, and the center of the upper pressure plate 2 are located on the same axis;
bear dish 1 and last pressure disk 2 down and link to each other with drawing the compression testing machine interface respectively, go up pressure disk 2 and just right the setting bear the top of dish 1 under, it can be close to down and bear dish 1 by upper and lower axial translation under external power source, that is to say the drive of drawing the compression testing machine.
The clamping assembly 3 comprises an upper pressing sheet 31, a lower pressing sheet 32 arranged right below the upper pressing sheet 31 and a connecting piece 33 used for axially connecting the upper pressing sheet 31 and the lower pressing sheet 32, wherein the upper pressing sheet 31 and the lower pressing sheet 32 are coaxially arranged;
in order to ensure the coaxiality of the upper pressing plate 31 and the lower pressing plate 32 and improve the machining precision, the upper pressing plate 31 and the lower pressing plate 32 can be formed by half-cutting the stepped cylinder 34. Meanwhile, a through hole 341 and a threaded hole 342 with internal threads are symmetrically formed in the stepped cylinder 34, so that when the clamping assembly 3 is assembled, the upper pressing piece 31 and the lower pressing piece 32 are directly stacked up and down, and then the connecting piece 33, which is selected by a bolt in the embodiment, vertically penetrates through the through hole 341 and then is in threaded connection with the threaded hole 342, so that the fixed connection of the upper pressing piece 31 and the lower pressing piece 32 is realized. In order to prevent the tip of the connecting member 33 from protruding the upper surface of the upper pressing piece 31, a step structure is formed in the through hole 341 so that the tip of the connecting member 33 is received in the larger inner diameter portion of the through hole 341.
In order to ensure the upper and lower concentric structures of the clamping assembly 3 and the lower carrier tray 1, the clamping assembly 3 is connected to the lower carrier tray 1 in a rotation-stop fit manner, specifically, a lower protrusion 321 is formed on the lower pressing sheet 32, and a through groove 121 adapted to the lower protrusion 321 is formed on the lower carrier tray 1. Because the lower pressing plate 32 is formed by half-cutting the stepped cylindrical part 34, the lower convex part 321 is of a semi-cylindrical structure, the through groove 121 is also of a semi-circular structure, and the lower convex part 321 is inserted into the through groove 121, so that the rotation stopping matching connection of the lower pressing plate 32 and the lower bearing disc 1 is realized.
In order to facilitate the relative rotation of the lower bearing disc 1 and the tension and compression testing machine so as to adjust the position, the lower bearing disc 1 comprises an upper body 11 and a lower body 12 which are coaxial, the upper body 11 is of a cylindrical structure, the lower body 12 is of a cylindrical structure with an outer diameter smaller than that of the upper body 11, and the through groove 121 penetrates through the upper body 11 and the lower body 12.
The object 4 to be tested comprises a base body 41 and an outer arc surface 42 bonded with the base body 41 together, when a shear test is carried out, the base body 41 is placed between the upper pressing sheet 31 and the lower pressing sheet 32, and then the connecting piece 33 longitudinally penetrates through the through hole 341 of the upper pressing sheet 31 and then is connected with the threaded hole 342 of the lower pressing sheet 32; in order to achieve the stability and accuracy of the test, the step cylindrical members 34 with different heights and different step thicknesses are selected according to the object 4 to be tested, namely the semicircular characteristics of the drum brake pad, when the step thickness of the step cylindrical member 34 is equivalent to the width of the base 41 of the object 4 to be tested, and the height of the part with the smaller outer diameter of the step cylindrical member 34 is equivalent to the height of the base 41 of the object 4 to be tested, the object 4 to be tested can be stably clamped, and at the moment, the outer arc surface 42 protrudes out of the side wall of the clamping assembly, namely, the side wall of the upper pressing plate 31 and the side wall of the lower pressing plate 32.
At least one group of arc-shaped grooves 21 are formed on the upper pressure plate 2 along the circumferential direction, and the arc-shaped grooves 21 and the upper pressure plate 2 are concentrically arranged and penetrate through the thickness direction of the upper pressure plate 2; in the present embodiment, the number of the arc-shaped slots 21 is two, and one set of the arc-shaped slots 21 includes a first arc-shaped slot 211 and a second arc-shaped slot 212 which are adjacent to each other.
The cutting blade 5 is connected to the arc-shaped slots 21 by the fastening members 51, and when the number of the arc-shaped slots 21 is two, the number of the fastening members 51 is also two, and the fastening members include a first fastening member 511 and a second fastening member 512, the first fastening member 511 is connected to the cutting blade 5 after passing through the first arc-shaped slot 211, and the second fastening member 512 is connected to the cutting blade 5 after passing through the second arc-shaped slot 212. In the embodiment, the fastening member 51 is a bolt, and the two arc-shaped grooves and the two fastening members are connected in a matching manner to ensure the stability of the shearing blade 5.
The width of the arc-shaped groove 21 is larger than the outer diameter of the part of the fastening piece 51 penetrating through the arc-shaped groove 21, so that the gap adjustment of the position of the shearing knife 5 can be realized by fine adjustment of the distance between the fastening piece 51 and two side surfaces of the inner wall of the arc-shaped groove 21, the tight fit of the shearing knife 5 and the side wall of the clamping component 3 is ensured, and more specifically, the tight fit of the shearing surface 52 of the shearing knife 5 and the outer wall of the upper pressing sheet 31 is ensured.
The inner side surface of the shearing knife 5 is a shearing surface 52 which is in a circular arc surface structure, the outer side surface of the shearing knife 5 is in a rectangular structure, one function is to facilitate the connection of the first fastening piece 511 and the second fastening piece 512, and the other function is to increase the overall strength of the shearing knife 5.
The radian of shear plane 52 is the same with the bonding surface radian of base member 41 and extrados 42, when carrying out drum brake block shear test, starts the tension and compression testing machine, connects shear knife 5 on last pressure disk 2 and moves down along with last pressure disk 2 is synchronous, cuts the extrados 42 of the object 4 that awaits measuring, and shearing force when base member 41 and extrados 42 through the response piece detection object 4 that awaits measuring separate reaches the purpose of detecting both cohesive forces.
The foregoing detailed description is intended to illustrate and not limit the invention, which is intended to be within the spirit and scope of the appended claims, and any changes and modifications that fall within the true spirit and scope of the invention are intended to be covered by the following claims.
Claims (8)
1. The utility model provides a drum brake piece shear test device which characterized in that includes:
a lower carrier plate (1);
the upper pressure plate (2) is arranged over the lower bearing plate (1) in an opposite way and can axially translate under the drive of an external power source;
the clamping assembly (3) is connected to the lower bearing disc (1) in a rotation stopping matching mode and used for clamping an object to be detected (4), a base body (41) of the object to be detected (4) is located between the clamping assemblies, and an outer arc surface (42) of the object to be detected (4) protrudes out of the side wall of the clamping assembly;
the shearing knife (5) is connected with the upper pressure plate (2), the shearing surface (52) of the shearing knife is attached to the side wall of the clamping component (3), and the shearing knife can synchronously move downwards along with the upper pressure plate (2) to shear the outer arc surface (42) of the object to be measured (4);
the upper pressure plate (2), the clamping assembly (3) and the lower bearing plate (1) are coaxially arranged up and down;
the clamping assembly (3) comprises an upper pressing sheet (31), a lower pressing sheet (32) which is positioned under the upper pressing sheet (31) and is coaxially arranged with the upper pressing sheet (31), and a connecting piece (33) which is used for axially connecting the upper pressing sheet (31) and the lower pressing sheet (32), wherein a lower convex part (321) which can be in rotation stopping fit connection with the lower bearing disc (1) is formed on the lower pressing sheet (32);
the upper pressing sheet (31) and the lower pressing sheet (32) are formed by half-cutting a step cylindrical piece (34), and a through hole (341) and a threaded hole (342) are symmetrically formed in the step cylindrical piece (34).
2. The drum brake pad shear test device of claim 1, wherein: a semicircular through groove (121) matched with the lower convex part (321) is formed in the lower bearing disc (1).
3. The drum brake shear test device of claim 2, wherein: the lower bearing disc (1) comprises an upper body (11) and a lower body (12) which are coaxially arranged, the lower body (12) is of a cylindrical structure, the outer diameter of the cylindrical structure is smaller than that of the upper body (11), and the through groove (121) penetrates through the upper body (11) and the lower body (12).
4. The drum brake pad shear test device of claim 1, wherein: the step thickness of the step cylindrical piece (34) is equivalent to the width of the base body (41) of the object to be measured (4).
5. The drum brake pad shear test device of claim 1, wherein: go up pressure disk (2) along circumference formation rather than the concentric at least a set of arc wall (21) that sets up, cut sword (5) and link to each other with arc wall (21) through fastener (51).
6. The drum brake shear test device of claim 5, wherein: the width of the arc-shaped groove (21) is larger than the outer diameter of the part of the fastening piece (51) passing through the arc-shaped groove (21).
7. The drum brake assembly shear test device of claim 5, wherein: the fastening piece (51) comprises a first fastening piece (511) and a second fastening piece (512), the group of arc-shaped grooves (21) comprises a first arc-shaped groove (211) and a second arc-shaped groove (212), the first fastening piece (511) penetrates through the first arc-shaped groove (211) to be connected with the shearing knife (5), and the second fastening piece (512) penetrates through the second arc-shaped groove (212) to be connected with the shearing knife (5).
8. The drum brake pad shear test device of claim 1, wherein: the outer side surface of the shearing knife (5) is of a rectangular structure, the shearing surface (52) is of an arc surface structure, and the radian of the shearing surface is the same as that of a bonding surface of the base body (41) and the outer arc surface (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010150880.6A CN111413215B (en) | 2020-03-06 | 2020-03-06 | Drum brake piece shear test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010150880.6A CN111413215B (en) | 2020-03-06 | 2020-03-06 | Drum brake piece shear test device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111413215A CN111413215A (en) | 2020-07-14 |
| CN111413215B true CN111413215B (en) | 2023-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010150880.6A Active CN111413215B (en) | 2020-03-06 | 2020-03-06 | Drum brake piece shear test device |
Country Status (1)
| Country | Link |
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| CN (1) | CN111413215B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6324916B1 (en) * | 1999-12-15 | 2001-12-04 | Ultradent Products, Inc. | Testing shear bond strength |
| US6550343B2 (en) * | 2001-07-13 | 2003-04-22 | Westinghouse Air Brake Technologies Corporation | Method and apparatus for testing shear strength of rubber bonded to metal insert |
| US9091619B2 (en) * | 2013-08-12 | 2015-07-28 | The Boeing Company | Circumferential shear test method and apparatus for a sandwich structure |
| CN207215608U (en) * | 2017-08-21 | 2018-04-10 | 烟台市产品质量监督检验所 | Brake shoe shear intensity testing machine |
| CN207123447U (en) * | 2017-08-21 | 2018-03-20 | 烟台市产品质量监督检验所（烟台市纺织纤维检验所、国家葡萄酒质量监督检验中心） | Brake shoe shear strength test fixture |
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2020
- 2020-03-06 CN CN202010150880.6A patent/CN111413215B/en active Active
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| CN111413215A (en) | 2020-07-14 |
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