CN211978521U - Tensile test fixture for glass fiber reinforced cement sample - Google Patents
Tensile test fixture for glass fiber reinforced cement sample Download PDFInfo
- Publication number
- CN211978521U CN211978521U CN202020262070.5U CN202020262070U CN211978521U CN 211978521 U CN211978521 U CN 211978521U CN 202020262070 U CN202020262070 U CN 202020262070U CN 211978521 U CN211978521 U CN 211978521U
- Authority
- CN
- China
- Prior art keywords
- clamping
- glass fiber
- fiber reinforced
- clamping piece
- reinforced cement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model provides a glass fiber reinforced cement sample tensile test anchor clamps, anchor clamps include a pair of fixture relative and symmetrical arrangement, and fixture includes: the chuck comprises a chuck body, wherein the left side and the right side of the chuck body are respectively fixed with at least one first elastic mechanism which transversely penetrates through the chuck body from outside to inside; the clamping device is arranged in the chuck body and provided with at least one pair of clamping pieces, a clamping piece seat is arranged between the inner wall of the groove and the clamping pieces, the inner side end of the first elastic mechanism abuts against the side wall of the clamping piece seat, the contact surface of the clamping piece seat and the clamping pieces is an inclined surface, supporting screws are arranged on the inclined surface of the clamping pieces, inclined grooves are arranged on the inclined surface of the clamping piece seat, each row of supporting screws are respectively embedded into each inclined groove, and a second elastic mechanism is arranged in each inclined groove; and the clamping hand wheel is arranged on the chuck body in a threaded manner and transversely penetrates through the chuck body to abut against the clamping piece seat. The utility model discloses can provide great pulling force to satisfy harsher test requirement.
Description
Technical Field
The utility model relates to a glass fiber reinforced cement board field especially relates to a glass fiber reinforced cement sample tensile test anchor clamps.
Background
The glass fibre reinforced cement is a hydraulic new composite material formed from alkali-resistant glass fibre and low-alkalinity cement, and its main characteristics are high strength, crack resistance, fire resistance, good toughness, not afraid of freezing and easy to form, and can be made into various building components and products with thin wall, high strength and complex shape, so that it has extensive application in the fields of civil engineering, building, agriculture, fishery and environmental art, etc.
At present, when a glass fiber reinforced cement board sample is subjected to tensile test in the industry, the tensile test on the glass fiber reinforced cement sample is generally realized by clamping the upper end and the lower end of the glass fiber reinforced cement sample by using a wedge-shaped clamp and applying reverse tensile force or realized by clamping the upper end and the lower end of the glass fiber reinforced cement sample by using a plane opposite clamping clamp and applying reverse tensile force.
The clamping mode of the rotary wedge-shaped clamp is completely realized by depending on the friction force between the inclined plane clamping piece and the glass fiber reinforced cement sample, the requirement on the flatness of the sample is very high, and the magnitude of the friction force directly depends on the magnitude of the horizontal clamping force of the inclined plane clamping piece. If the clamping force of the inclined clamping piece is small, clamping is not firm, the glass fiber reinforced cement is easy to break away from the clamping piece of the wedge-shaped clamp, and if the clamping force is large, the glass fiber reinforced cement sample is easy to break at the shearing position of the jaw formed under the action of the horizontal clamping force relative to the inclined clamping piece, so that the success rate of the test is influenced.
The plane opposite clamping fixture is used for clamping a glass fiber reinforced cement sample by adopting direct opposite clamping, the requirement on the flatness of the sample is low, but the requirement on controlling the clamping force is high, the sample is directly clamped off too high and is easily clamped too low, and the test fails.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a clamping structure of glass fiber reinforced cement board sample test fixture is provided, this clamping structure adopts the centre gripping of wafer formula wedge structure, has wedge anchor clamps centre gripping and the advantage to wafer jig concurrently.
The utility model discloses a realize through following technical scheme:
the utility model provides a glass fiber reinforced cement sample tensile test anchor clamps, anchor clamps include relative and symmetrical arrangement's a pair of fixture, and banding glass fiber reinforced cement sample is stretched into among the fixture and locking by this pair of fixture centre gripping and both ends, each fixture includes:
the clamping head comprises a clamping head body, wherein one side of the clamping head body, which is opposite to the other clamping head body, is provided with a groove with an opposite opening, and the left side and the right side of the clamping head body are both fixed with at least one first elastic mechanism which transversely penetrates through the clamping head body from outside to inside;
the clamping device is arranged in the groove, the middle of the clamping device is provided with at least one pair of clamping pieces which are oppositely clamped, the clamping pieces clamp the end part of the glass fiber reinforced cement sample in the middle, a clamping piece seat is arranged between the inner wall of the groove and the clamping pieces, the inner side end of the first elastic mechanism is abutted on the side wall of the clamping piece seat, the contact surface of the clamping piece seat and the clamping pieces is an inclined surface, the clamping mechanism faces to the central line direction in the length direction of the glass fiber reinforced cement sample, the vertical distance between the inclined surface and the glass fiber reinforced cement sample is gradually reduced,
the inclined plane of the clamping piece is provided with at least one row of supporting screws vertical to the inclined plane, the inclined plane of the clamping piece seat is provided with at least one chute consistent with the length direction of the glass fiber reinforced cement sample, each row of supporting screws are respectively embedded into each chute, two second elastic mechanisms positioned at the upper end and the lower end of the row of supporting screws are arranged in each chute, the stretching direction of each second elastic mechanism is the same as the direction of each chute, and the stretching directions of the two second elastic mechanisms are opposite and face towards the supporting screws in the middle;
and the clamping hand wheels are arranged on the left side and the right side of the chuck body through threads and transversely penetrate through the chuck body and are abutted against the side walls of the clamping piece seats.
Furthermore, the first elastic mechanism is composed of a first bolt at one end and a first spring at the other end, the first bolt is fixed on the chuck body, and the first spring abuts against the side wall of the chuck seat.
Further, a shallow groove is formed in the side wall of the clamping piece seat, and the tail end of the first spring abuts against the shallow groove.
Further, the second elastic mechanism is composed of a second bolt at one end and a second spring at the other end, the second bolt is embedded and fixed in the inclined groove, and the second spring is located between the supporting screw and the second bolt.
Furthermore, two longitudinal rows of first elastic mechanisms are fixed on the chuck body, and each row is provided with two first elastic mechanisms;
two rows of supporting screws are arranged on the clamping piece, and each row is provided with two supporting screws;
two inclined grooves are arranged on the clamping piece seat.
Furthermore, the front side and/or the rear side of the chuck body are/is provided with a locking pin in a threaded manner, and the locking pin transversely penetrates through the chuck body and abuts against the clamping hand wheel.
Furthermore, a clamping surface of the clamping piece, which is opposite to the other side of the inclined surface, is provided with a fine tooth reticulate pattern, and the side edge of the clamping surface, which faces to the center line direction in the length direction of the glass fiber reinforced cement sample, is an arc edge.
The beneficial effects of the utility model reside in that:
1. the clamping piece and the clamping piece seat are clamped by the clamping inclined plane, so that the center of the glass fiber reinforced cement board sample and the center of the clamping head are adjustable;
2. the clamping of the opposite clamping inclined surfaces is adopted, so that the acting force between the glass fiber reinforced cement board sample and the clamping surfaces is ensured to be increased along with the increase of the tension value;
3. the clamping inclined plane is adopted for clamping, the friction coefficient between the glass fiber reinforced cement board sample and the clamping surface can be increased by clamping the fine-tooth reticulate pattern on the clamping surface, the static friction force of the clamping is increased, and the arc at the tail end of the clamping is over, so that the sample is effectively prevented from being broken at the jaw.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a perspective view of a tensile test fixture for a glass fiber reinforced cement sample provided by the present invention;
FIGS. 2-3 are cross-sectional views of the present invention;
FIG. 4 is a schematic view of the chuck body slot opening direction;
FIGS. 5a-5b are side and perspective views of a clip;
FIG. 5c is a schematic view of a fine tooth mesh provided on the clamping surface of the clip;
fig. 6a-6b are perspective views of the cartridge in front and rear directions.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the present invention.
In order to thoroughly understand the present invention, detailed steps and detailed structures will be provided in the following description so as to explain the technical solution of the present invention. The preferred embodiments of the present invention are described in detail below, however, other embodiments of the present invention are possible in addition to these detailed descriptions.
The utility model provides a glass fiber reinforced cement sample tensile test anchor clamps, as shown in fig. 1-3, anchor clamps include relative and symmetrical arrangement's a pair of fixture, and banding glass fiber reinforced cement sample 12 is stretched into to fixture and locking in by this pair of fixture centre and both ends, each fixture includes:
the chuck comprises a chuck body 1, wherein one side of the chuck body 1, which is opposite to the other chuck body 1, is provided with a groove 1a with opposite openings, as shown in fig. 4, and the left side and the right side of the chuck body 1 are both fixed with at least one first elastic mechanism which transversely penetrates through the chuck body 1 from outside to inside;
the clamping device is arranged in the groove 1a, as shown in fig. 5a-6b, at least one pair of clamping pieces 7 are arranged in the middle of the clamping device in a butt-clamping mode, the ends of the glass fiber reinforced cement samples 12 are clamped in the middle by the at least one pair of clamping pieces 7, a clamping piece seat 6 is arranged between the inner wall of the groove 1a and the clamping pieces 7, the inner side end of the first elastic mechanism abuts against the side wall of the clamping piece seat 6, the contact surface of the clamping piece seat 6 and the clamping pieces 7 is an inclined surface 62, the vertical distance between the inclined surface and the glass fiber reinforced cement samples 12 is gradually reduced in the direction that the clamping mechanism faces the central line 12a in the length direction of the glass fiber reinforced cement samples 12,
at least one row of supporting screws 9 vertical to the inclined surface is arranged on the inclined surface 72 of the clamping piece 7, and the supporting screws 9 are fixed through threaded holes 70 arranged on the inclined surface of the clamping piece 7. At least one inclined groove 60 which is consistent with the length direction of the glass fiber reinforced cement sample 12 is arranged on the inclined surface of the clamping piece seat 6, each row of supporting screws 9 are respectively embedded into each inclined groove 60, two second elastic mechanisms which are positioned at the upper end and the lower end of the row of supporting screws 9 are arranged in each inclined groove 60, the extension direction of each second elastic mechanism is the same as the direction of each inclined groove 60, and the extension directions of the two second elastic mechanisms are opposite and face towards the middle supporting screw 9, as shown in fig. 2;
the clamping hand wheels 8 are arranged on the left side and the right side of the chuck body 1 through threads, and the clamping hand wheels 8 transversely penetrate through the chuck body 1 and abut against the side walls of the clamping piece seats 6.
In an alternative embodiment, the first elastic mechanism is composed of a first bolt 2 at one end and a first spring 3 at the other end, the first bolt 2 is fixed on the chuck body 1, and the first spring 3 abuts against the side wall of the clamping piece seat 6.
In an alternative embodiment, as shown in fig. 6a-6b, the side walls of the holder 6 are provided with a first shallow groove 64 and a second shallow groove 61, the tip of the first spring 3 abutting in the first shallow groove 64 and the threaded portion of the clamping handwheel being provided in the second shallow groove 61. Wherein, neither the first shallow groove 64 nor the second shallow groove 61 penetrates through the clamping piece seat 6.
In an alternative embodiment, the second elastic means is constituted by a second bolt 4 at one end and a second spring 5 at the other end, the second bolt 4 being embedded and fixed in the inclined groove 60, and the second spring 5 being located between the support screw 9 and the second bolt 4.
In an alternative embodiment, two longitudinal rows of first elastic mechanisms are fixed on the chuck body 1, and each row has two first elastic mechanisms; two rows of supporting screws 9 are arranged on the clamping piece 7, and each row is provided with two supporting screws 9; the clamping piece seat 6 is provided with two inclined grooves 60.
In an alternative embodiment, the front side and/or the rear side of the chuck body 1 is/are provided with a locking pin 11, and after the chuck body 1 is installed in place, the locking pin 11 transversely penetrates through the through hole 1b of the chuck body 1 and the through hole 63 of the chuck base 6 in sequence and abuts against the threaded part of the clamping handwheel 8.
In an alternative embodiment, the clamping surface of the clamping piece 7 opposite to the inclined surface is provided with fine tooth patterns, which can enhance the friction coefficient between the cement board sample and the clamping surface, thereby increasing the clamping static friction force, as shown in fig. 5 c. In addition, the side edge of the clamping surface facing the central line direction of the glass fiber reinforced cement sample 12 in the length direction is an arc edge, so that the sample is effectively prevented from being broken at the jaw.
Two chuck bodies 1 are installed on a universal testing machine through a bolt, a locking nut 10 is locked to ensure that the connection between the chuck bodies and the testing machine is reliable, a glass fiber reinforced cement board sample 12 is placed in the middle of a clamping piece 7, a clamping hand wheel 8 is rotated to push a clamping piece seat 6 to drive an inclined plane clamping piece 7 to clamp the glass fiber reinforced cement board sample 12, and after the glass fiber reinforced cement board sample 12 is completely clamped by the inclined plane clamping piece 7, the testing machine is started to directly perform a tensile test on the glass fiber reinforced cement board sample.
When a tensile test is carried out, the upper end and the lower end of a glass fiber reinforced cement board sample 12 are respectively clamped by an inclined plane clamping piece 7, a testing machine is started, an acting force can be applied to a clamping piece seat 6 under the action of a first spring 3 in the testing machine, and a force along the inclined plane can move downwards in a chute 60 of the clamping piece seat 6 due to a second elastic mechanism comprising a second spring 5 so as to clamp the sample; the clamping force increases with the movement of the sample due to the spring action during the stretching process; in addition, the clamping force of the chuck on the glass fiber reinforced cement board sample is naturally and gradually increased along with the gradual increase of the tensile force in the test process, and the glass fiber reinforced cement board sample with the inclined surface structure is perpendicular to the sample in the stress direction, so that the chuck cannot form jaw shearing force on the sample, and the glass fiber reinforced cement board sample cannot break at the clamping part of the chuck even if the tensile force is large; the inclined plane also has a self-locking function, so that the inclined plane can not fall off from the chuck body, and the glass fiber reinforced cement board sample is firmly clamped in the chuck.
The above description is directed to the preferred embodiment of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that devices and structures not described in detail are understood to be implemented in a manner common in the art; without departing from the scope of the invention, it is intended that the present invention shall not be limited to the above-described embodiments, but that the present invention shall include all the modifications and variations of the embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still fall within the protection scope of the technical solution of the present invention, where the technical entity does not depart from the content of the technical solution of the present invention.
Claims (7)
1. The utility model provides a glass fiber reinforced cement sample tensile test anchor clamps, its characterized in that, anchor clamps include a pair of fixture of relative and symmetrical arrangement, and banding glass fiber reinforced cement sample (12) are stretched into among the fixture and are locked by this pair of fixture centre and both ends centre gripping, each fixture includes:
the clamp comprises a clamp body (1), wherein one side of the clamp body (1) opposite to the other clamp body is provided with a groove (1a) with opposite openings, and the left side and the right side of the clamp body (1) are respectively fixed with at least one first elastic mechanism transversely penetrating through the clamp body (1) from outside to inside;
clamping device, install in groove (1a), clamping device middle at least a pair of clamping piece (7) of clamp setting, at least a pair of clamping piece (7) with the tip centre gripping of glass fiber reinforced cement sample (12) in the middle of, at the inner wall of groove (1a) with be equipped with clamping piece seat (6) between clamping piece (7), the medial extremity butt of first elastic mechanism is on clamping piece seat (6) lateral wall, the contact surface of clamping piece seat (6) and clamping piece (7) is the inclined plane, at fixture orientation the ascending central line direction of glass fiber reinforced cement sample (12) length direction, the inclined plane with perpendicular distance between glass fiber reinforced cement sample (12) reduces gradually,
at least one row of supporting screws (9) vertical to the inclined plane is arranged on the inclined plane (70) of the clamping piece (7), at least one inclined groove (60) consistent with the length direction of the glass fiber reinforced cement sample (12) is arranged on the inclined plane (62) of the clamping piece seat (6), each row of supporting screws (9) are respectively embedded into each inclined groove (60), two second elastic mechanisms positioned at the upper end and the lower end of the row of supporting screws (9) are arranged in each inclined groove (60), the stretching direction of each second elastic mechanism is the same as the direction of each inclined groove (60), and the stretching directions of the two second elastic mechanisms are opposite and face towards the middle supporting screw (9);
the clamping hand wheels (8) are arranged on the left side and the right side of the chuck body (1) through threads, and the clamping hand wheels (8) transversely penetrate through the chuck body (1) and abut against the side walls of the clamping piece seats (6).
2. The tensile test fixture for the glass fiber reinforced cement specimen according to claim 1, wherein the first elastic mechanism is composed of a first bolt (2) at one end and a first spring (3) at the other end, the first bolt (2) is fixed on the chuck body (1), and the first spring (3) abuts against the side wall of the chuck seat (6).
3. The clamp for tensile testing of a glass fiber reinforced cement specimen according to claim 2, wherein the side wall of the clamping piece holder (6) is provided with a first shallow groove (64) and a second shallow groove (61), the tip of the first spring (3) abuts in the first shallow groove (64), and the threaded portion of the clamping hand wheel is provided in the second shallow groove (61).
4. The tensile test fixture for a glass fiber reinforced cement specimen according to claim 1, wherein the second elastic means is composed of a second bolt (4) at one end and a second spring (5) at the other end, the second bolt (4) is embedded and fixed in the inclined groove (60), and the second spring (5) is located between the support screw (9) and the second bolt (4).
5. The tensile test fixture for glass fiber reinforced cement samples according to claim 2 or 4, wherein two longitudinal rows of the first elastic mechanisms are fixed on the chuck body (1) and each row has two first elastic mechanisms;
two rows of supporting screws (9) are arranged on the clamping piece (7), and each row is provided with two supporting screws (9);
two inclined grooves (60) are arranged on the clamping piece seat (6).
6. The clamp for the tensile test of the glass fiber reinforced cement sample according to claim 1, wherein the front side and/or the rear side of the clamp body (1) is/are provided with a locking pin (11) in a threaded manner, and the locking pin (11) transversely penetrates through the clamp body (1) and the clamp seat (6) in sequence and abuts against the clamping hand wheel (8).
7. The tensile testing jig for a glass fiber reinforced cement specimen according to claim 1, wherein the clamping surface of the clamping piece (7) on the other side of the inclined surface is provided with a fine tooth net, and the side edge of the clamping surface facing the direction of the center line in the length direction of the glass fiber reinforced cement specimen (12) is an arc edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020262070.5U CN211978521U (en) | 2020-03-05 | 2020-03-05 | Tensile test fixture for glass fiber reinforced cement sample |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020262070.5U CN211978521U (en) | 2020-03-05 | 2020-03-05 | Tensile test fixture for glass fiber reinforced cement sample |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211978521U true CN211978521U (en) | 2020-11-20 |
Family
ID=73377624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020262070.5U Active CN211978521U (en) | 2020-03-05 | 2020-03-05 | Tensile test fixture for glass fiber reinforced cement sample |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211978521U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540656A (en) * | 2018-12-11 | 2019-03-29 | 东华大学 | A kind of anti-skidding lossless clamper and purposes suitable for flexible high-performance fiber beam |
| CN112665984A (en) * | 2021-01-08 | 2021-04-16 | 安徽理工大学 | Wedge-shaped clamp for testing uniaxial tensile property of rock |
-
2020
- 2020-03-05 CN CN202020262070.5U patent/CN211978521U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109540656A (en) * | 2018-12-11 | 2019-03-29 | 东华大学 | A kind of anti-skidding lossless clamper and purposes suitable for flexible high-performance fiber beam |
| CN109540656B (en) * | 2018-12-11 | 2022-07-05 | 东华大学 | Anti-skid lossless clamp suitable for flexible high-performance fiber bundle and application |
| CN112665984A (en) * | 2021-01-08 | 2021-04-16 | 安徽理工大学 | Wedge-shaped clamp for testing uniaxial tensile property of rock |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211978521U (en) | Tensile test fixture for glass fiber reinforced cement sample | |
| CN109030248B (en) | I-II composite type crack fatigue propagation rate test device and test method | |
| US4470586A (en) | Machine clamp rockable in T slot | |
| DE102012200911B4 (en) | tensioning device | |
| CN110186751A (en) | A kind of clamping plate type anchorage for light circle pultrusion CFRP bar drawing test | |
| US4073185A (en) | Test piece gripping device | |
| CN214942706U (en) | Prestressed carbon fiber plate tensioning external member | |
| CN211553565U (en) | Z-direction stretching sample clamping device | |
| CN219084594U (en) | Shearing-resistant clamp for steel bar welded mesh | |
| CN201188078Y (en) | Special fixture for tensile test of high intensity steels | |
| CN112798406B (en) | Clamp for testing shearing performance of composite material | |
| CN204758395U (en) | Tensile anchor clamps of sample | |
| JP2018090967A (en) | Tile peeling device | |
| CN110220774B (en) | Test fixture capable of realizing loading at any point in plane | |
| CN220552697U (en) | Clamp and tool for insulating paper tensile test | |
| WO2019206071A1 (en) | Embedded-type anchor device for tensile testing of rock, and testing method | |
| CN205374184U (en) | Steel fibre stretch -draw centre gripping anchor clamps and steel fibre tensile strength test system | |
| CN213580388U (en) | Wedge-shaped tensile clamp and tensile test equipment comprising same | |
| CN216484301U (en) | Clamping tool for universal testing machine | |
| CN212871967U (en) | Tensile fixture for high-hardness brittle material | |
| CZ2015578A3 (en) | A test specimen of concrete and fibre concrete for the axial tension test and a tool for its mounting | |
| CN220437980U (en) | Plate test fixture for fatigue testing machine | |
| CN220508647U (en) | Test structure and test device for tensile strength and ultimate failure strain of asphalt mixture | |
| CN216990876U (en) | Four-direction positioning clamping machining fixing tool | |
| CN219521946U (en) | Semi-slotted mounting elasticity instrument |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |