CN101430320B

CN101430320B - Test piece centering device

Info

Publication number: CN101430320B
Application number: CN2008102097260A
Authority: CN
Inventors: 谭忆秋; 张磊; 薛忠军; 吴思刚; 程小亮; 韩超
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2008-12-17
Filing date: 2008-12-17
Publication date: 2012-06-06
Anticipated expiration: 2028-12-17
Also published as: CN101430320A

Abstract

The invention discloses a device for centering a test piece, relating to a centering device used for low temperature TSRST. The invention solves the problem that at present ocular estimate is used for ensuring that the test piece is bonded with a clamp perpendicularly so that errors generated by the ocular estimate can not assure the perpendicularity between the test piece and the clamp and then the test result is not accurate. A movable plate is sheathed on a guide way vertically; an upper limiting plate is fixedly arranged at the top end of the guide way; the lower limiting plate is fixedly arranged at the lower end of the guide way; a screw is fixedly connected with the movable plate; a screw nut is matched with the screw exposed on the upper limiting plate; the movable plate is provide with an upper limiting groove and an upper slide way; the lower limiting plate is provided with an lower limiting groove and a flute; the upper limiting groove is arranged opposite the lower limiting groove and the two grooves are equally sized; the upper slide way is arranged opposite the flute and the slide way and the flute are equally sized; the upper end of a positioning plate is arranged in the upper slide way; and the lower end is arranged in the flute. The device can ensure that the test piece and the clamp are vertically bonded and centered so that an accurate test result is achieved.

Description

The test specimen centering device

Technical field

The present invention relates to a kind of test specimen centering device that low temperature freezes disconnected test that is used for.

Background technology

Carrying out low temperature when freezing disconnected test both at home and abroad at present; Mostly be to guarantee the vertical of bitumen mixture specimen and anchor clamps by range estimation; But, because inaccuracy and the test specimen of range estimation be difficult to guarantee that end face is vertical with other face when post forming, thus very difficult to the heart when bonding test specimen and anchor clamps; This just makes test specimen when being drawn, can produce flexural tensile stress at root, finally causes measurement result inaccurate.

Chinese patent number is 200620077570.1, open day be that the utility model patent on October 17th, 2007 discloses a kind of disconnected piece fixture that is applied in the tension test; This patent is to utilize the positioning baffle at pedestal two ends and the circular groove on each support that test specimen is aligned; Technology is simple though this patent has, convenience operation; But this patent can not be applied on the test specimen of different size, and in the test drawing process, is easy to generate flexural tensile stress and test findings is impacted at the test specimen root; Make test findings inaccurate, reduced the precision of test.

Summary of the invention

The objective of the invention is to be applied on the test specimen of different size for solving existing piece fixture; And in the test drawing process, be easy to generate flexural tensile stress and test findings is impacted at the test specimen root; Make test findings inaccurate; Reduced the problem of the precision of test, a kind of test specimen centering device is provided.

The present invention includes and comprise screw rod, nut, upper limit plate, movable plate, three guide rails, lower limiting board and location-plates, movable plate is vertical with three guide rails and be sleeved on three guide rails, and the upper limit plate is vertical with three guide rails and be packed in the top of three guide rails; Lower limiting board is vertical with three guide rails and be packed in the lower end of three guide rails; The lower end of screw rod and the upper surface of movable plate are affixed, and the upper limit plate is passed in the upper end of screw rod, and nut cooperates with screw rod on being exposed at the upper limit plate outward; Movable plate is provided with upper limit groove and upper hopper chute; Lower limiting board is provided with lower limit groove and groove, upper limit groove and the big or small identical of lower limit groove and over against, upper hopper chute and the big or small identical of groove and over against; The upper end of location-plate is arranged in the upper hopper chute, and the lower end of location-plate is arranged in the groove.

The invention has the beneficial effects as follows: because the present invention is provided with upper limit groove and lower limit groove respectively on movable plate and lower limiting board; Vertical and when utilizing location-plate to guarantee bonding testing piece to the heart with anchor clamps; Avoid in the test drawing process producing flexural tensile stress and test findings being impacted at the test specimen root; Make test findings accurate, improved the precision of test.

Description of drawings

Fig. 1 is the one-piece construction stereographic map of test specimen centering device of the present invention; Fig. 2 is the one-piece construction stereographic map (removing location-plate 7) of test specimen centering device of the present invention; Fig. 3 be the A of Fig. 1 to view, Fig. 4 is the main cut-open view of movable plate 4, Fig. 5 is the upward view of Fig. 4; Fig. 6 is the main cut-open view of lower limiting board 6, and Fig. 7 is the vertical view of Fig. 6.

Embodiment

Embodiment one: combine Fig. 1～Fig. 7 that this embodiment is described; This embodiment comprises screw rod 1, nut 2, upper limit plate 3, movable plate 4, three guide rails 5, lower limiting board 6 and location-plates 7; Movable plate 4 and three guide rails 5 are vertical and be sleeved on three guide rails 5, and upper limit plate 3 and three guide rails 5 are vertical and be packed in the top of three guide rails 5, and lower limiting board 6 and three guide rails 5 are vertical and be packed in the lower end of three guide rails 5; The upper surface of the lower end of screw rod 1 and movable plate 4 is affixed; Upper limit plate 3 is passed in the upper end of screw rod 1, and nut 2 cooperates with screw rod 1 on being exposed at upper limit plate 3 outward, and movable plate 4 is provided with upper limit groove 4-1 and upper hopper chute 4-2; Lower limiting board 6 is provided with lower limit groove 6-1 and groove 6-2; Upper limit groove 4-1 and the big or small identical of lower limit groove 6-1 and over against, upper hopper chute 4-2 and the big or small identical of groove 6-2 and over against, the upper end of location-plate 7 is arranged among the upper hopper chute 4-2; The lower end of location-plate 7 is arranged among the groove 6-2, and location-plate 7 can slide the inside and outside in upper hopper chute 4-2 and groove 6-2; Movable plate 4 can move up and down along guide rail 5 through setting nut 2; The shape of upper limit groove 4-1 and lower limit groove 6-1 can change according to the piece fixture change in shape.During use, piece fixture is placed in the lower limit groove 6-1, confirms the position of test specimen and anchor clamps bonding through the position of adjustment location-plate 7; Simultaneously, slip location-plate 7 makes the flat one side of test specimen be adjacent to location-plate 7, when test specimen and anchor clamps bond when firm; It is taken off and is inverted, will put into the upper limit groove 4-1 on the movable plate 4, in the lower limit groove 6-1 of lower limiting board 6, put into another piece fixture with the anchor clamps of test specimen bonding; Adjustment nut 2, the position of change movable plate 4 makes the test specimen other end contact with anchor clamps; After bonding was firm, integral body was taken off and is placed in the low-temperature breaking test device by freezing.

Embodiment two: combine Fig. 3 that this embodiment is described, this embodiment with the difference of embodiment one is: it also increases has three linear bearings 8, is provided with each linear bearing 8 in movable plate 4 and the endoporus that each guide rail 5 is connected.Design makes movable plate 4 smooth and easy slip on guide rail 5 like this.Other composition and annexation are identical with embodiment one.

Embodiment three: combine Fig. 3 that this embodiment is described, this embodiment with the difference of embodiment two is: it also increases has thrust bearing 9, and thrust bearing 9 is sleeved on the screw rod 1 and between nut 2 and upper limit plate 3.Design makes that adjusting is convenient like this.Other composition and annexation are identical with embodiment two.

Claims

1. test specimen centering device; It is characterized in that: it comprises screw rod (1), nut (2), upper limit plate (3), movable plate (4), three guide rails (5), lower limiting board (6) and location-plate (7); Movable plate (4) is vertical with three guide rails (5) and be sleeved on three guide rails (5); (3 is vertical with three guide rails (5) and be packed in the top of three guide rails (5), and lower limiting board (6) is vertical with three guide rails (5) and be packed in the lower end of three guide rails (5), and the upper surface of the lower end of screw rod (1) and movable plate (4) is affixed for the upper limit plate; Upper limit plate (3) is passed in the upper end of screw rod (1); Nut (2) cooperates with screw rod (1) on being exposed at upper limit plate (3) outward, and movable plate (4) is provided with upper limit groove (4-1) and upper hopper chute (4-2), and lower limiting board (6) is provided with lower limit groove (6-1) and groove (6-2); Upper limit groove (4-1) and the big or small identical of lower limit groove (6-1) and over against; Upper hopper chute (4-2) and the big or small identical of groove (6-2) and over against, the upper end of location-plate (7) is arranged in the upper hopper chute (4-2), the lower end of location-plate (7) is arranged in the groove (6-2).

2. test specimen centering device according to claim 1 is characterized in that: it also includes three linear bearings (8), is provided with each linear bearing (8) in movable plate (4) and the endoporus that each guide rail (5) is connected.

3. test specimen centering device according to claim 2 is characterized in that: it also includes thrust bearing (9), and thrust bearing (9) is sleeved on the screw rod (1) and is positioned between nut (2) and the upper limit plate (3).