CN2740997Y

CN2740997Y - Electronic ejector with double sides

Info

Publication number: CN2740997Y
Application number: CN 200420061211
Authority: CN
Inventors: 胡国华
Original assignee: 胡景雯
Priority date: 2004-09-09
Filing date: 2004-09-09
Publication date: 2005-11-16
Anticipated expiration: 2014-09-09

Abstract

The utility model relates to an electronic ejector with double sides, belonging to the technical field of the physical length measuring instrument. The utility model solves the measuring error problem generated when a test sample bears the eccentric tension and generates additional bend because the two knife blades sensing the elongation of the test sample of the existing clamping electronic ejector are arranged on the same bus bar. The technical proposal adopted by the utility model for solving the problem is to arrange two three-edge blades for sensing the elongation of the test sample on two bus bars which are symmetrical with the axis line of the test sample, and thus the measuring error can not be generated by the test sample bearing the additional bend. As the three cutting edges of the three-edge blade are arranged on the same straight line, and a draw hook type spring clamping device provided with a V-shaped groove is also designed, the utility model avoids the rotation of the three cutting edges caused by the test samole bearing the additional bend. Thus the measuring error caused by clamping is avoided. The utility model can be used for measuring the axial elongation of a test sample in an elongation test, and thus the beneficial effect is that the measuring error is reduced.

Description

Bilateral electronics tens(i)ometer

Affiliated technical field

The utility model belongs to the technical field of physics class length measuring instrument.Be specifically related to measure the electronics tens(i)ometer of the axial elongation distortion of tensile sample.

Background technology

At present, various electronics pulling force Material Testing Machine both domestic and external all is equipped with folder formula electronics tens(i)ometer, two single dege blades that this folder formula electronics tens(i)ometer is experienced the sample marking distance elongation use bungee to be installed in a side of sample, promptly be two blades cutting edge respectively with Fig. 1 in the A point at sample marking distance section L two ends contact with the C point, thereby record the elongation of a bus AC of circular section sample.Because there is off-centre inevitably in the testing machine chuck, sample has small initial curvature and the uneven situation of material structure, so eccentric tension often takes place, be that axial tension and crooked combined deformation can take place sample, flexural deformation wherein causes elongation of bus (for example AC line among Fig. 1 and BD line) of sample both sides and another root to shorten, again with axial tension distortion superimposed after, make the total elongation of two symmetrical buses of sample both sides and axis inequality, and all can not represent the elongation of the pure stretcher strain of sample marking distance, thereby bring measuring error.In addition, because its two blades are to be banded in sample marking distance two ends cross-section with bungee, in deformation process, sample cross relatively rotates, drive two blades and also relatively rotate, the sensing element of tens(i)ometer (being similar to the flexible member 6 among Fig. 1) also will produce the another kind of measuring error that is caused by clamping after experiencing this kind rotation.These two kinds of errors are added up bigger often and have been surpassed the scope that allows in elastic stage.

Summary of the invention

The purpose of this utility model is will solve existing folder formula electronics tens(i)ometer influenced by the addition bend of eccentric tension and the problem that produces bigger measuring error, promptly is will design a kind ofly not influenced by sample flexural deformation and measure the electronics tens(i)ometer of the pure axial tension distortion of sample.

The purpose of this utility model adopts following technical scheme to realize: at first be to have designed three blade blades, blade and two next door blades in the middle of this three blade blades have one, and these three blades are on same straight line, and the knife back of middle blade and next door blade is respectively in the both sides of this straight line; Next is to have designed bow-shaped arm, thereby with three blade blade arrangement of two impression distortion on two symmetrical buses of sample both sides and sample axis, the installed surface and the bus of three blade blades are perpendicular, middle blade contacts with the xsect at sample marking distance two ends respectively, and contact point is B point and the C point among Fig. 1; The 3rd is the hook-type fixture of the spring that has designed band V-type groove, by next door blade and middle blade bilateral electronics tens(i)ometer is clamped on the sample, has replaced the clamping means that existing folder formula electronics tens(i)ometer uses bungee.

Technique effect of the present utility model is two rear flank that two three blade blades are installed in the symmetry of sample, wherein one measures diastrophic stretched portion, and another piece measures diastrophic compression section, the two is cancelled in instrument internal, promptly be to have deducted the measuring error that flexural deformation produces, measured pure axial tension distortion; In addition, under inevitable diastrophic influence, though fixture of the spring can rotate the identical rotation of generation along with sample cross, but owing to used three blade blades, fixture of the spring can not drive three blade blade rotation, thereby can not produce because the measuring error that the another kind that sample flexural deformation brings is caused by clamping.

The utility model is used for the axial elongation distortion that material tensile test is measured sample.

The beneficial effects of the utility model are to reduce measuring error, can measure material more accurately with use the relevant mechanical property of folder formula electronics tens(i)ometer, for example measure regulation permanent elongation intensity Rr and elastic modulus E etc. more accurately.

Description of drawings

Fig. 1 is a structure principle chart of the present utility model.

Fig. 2 is the EFGH cut-open view of Fig. 1.

Fig. 3 is the enlarged drawing of the K-K sectional view of Fig. 1.

Fig. 4 is the enlarged drawing of the I-I sectional view of Fig. 1.

Among the figure, 1. clamping cap, 2. compression spring, 3. the drag hook sliding sleeve is 4. gone up pickup arm, 5. connection seat, 6. flexible member, 7. resistance strain gage 8. descends pickup arm, 9. limit of range piece, 10. gauge length latch, 11. bow-shaped arm, the little axle of 12. guiding, 13. blade bearings, 14. 3 blade blades, 15. samples.

Length of the present utility model is of a size of 139mm * 33mm * 72mm.

Embodiment

In Fig. 1, the left end of two identical flexible members 6 is separately fixed at the two ends of connection seat 5 with screw, the right-hand member of following a slice flexible member 6 is screwed with following pickup arm 8 and connects, the following of following pickup arm right-hand member installed blade bearing 13 with screw, and the following of blade bearing 13 installed three blade blades 14 with screw; The right-hand member of top a slice flexible member 6 is with the left end of pickup arm on the screw attachment 4, use the chute (see figure 3) of screw attachment bow-shaped arm 11 left ends on the slide rail of last pickup arm 4 right-hand members, the arc object (see figure 2) of the integral body that bow-shaped arm 11 is made up of three straight-arms, an angle is arranged between the adjacent straight-arm, the optimum value of angle is 90 °, the right-hand member of bow-shaped arm 11 has been walked around sample 15, on the right-hand member of bow-shaped arm 11, another blade bearing 13 is installed, with screw another piece three blade blades 14 is installed above the blade bearing 13 with screw.Such structure makes the middle blade of two three blade blades contact with symmetrical two buses of sample axis respectively.

In Fig. 1, lead little axle 12, compression spring 2, clamping cap 1 and drag hook sliding sleeve 3 formed independently fixture of the spring, hooked with its V-shaped groove of two drag hooks three blade blades 14 two next door blades cutting edge and the cutting edge of the middle blade of three blade blades 14 is pressed on the cross-section of sample marking distance end, so far, bilateral electronics tens(i)ometer just has been installed on the sample, before adding pulling force P, extract gauge length latch 10 out (see figure 4).In test, when sample is subjected to addition bend and gauge length xsect when rotating, identical rotation takes place in fixture of the spring, but all pass through the common linear of three blades because of clamping force and friction force, so these power do not produce moment to cutting edge, thereby do not make three blade blades 14 rotate the measuring error that the another kind of having avoided addition bend to bring is caused by clamping.

When sample is subjected to pure axial tension, the contact point of two three blade blades 14 and sample is along with axial relative displacement takes place the upper and lower xsect of gauge length, cause that bow-shaped arm 11, last pickup arm 4 and following pickup arm 8 all are similar to the plane motion of rigid body, force flexible member 6 to bend, the resistance of the resistance strain gage of pasting on it 7 changes, and just measures the pure axial elongation amount of sample marking distance by the surveying instrument of Material Testing Machine.

The addition bend that acts on sample is simultaneous with pure axial tension often, in this case, since two three blade blades 14 be installed in two symmetrical buses of sample axis on, like this, the different elongation of two buses that addition bend caused will automatically be got its mean value in measuring system, guaranteed that measurement result is the pure axial tension elongation of sample marking distance, the measuring error that the elongation of having avoided a bus of an existing folder formula electronics tens(i)ometer test specimens is produced because of the bending influence of eccentric tension.

In Fig. 3, bow-shaped arm 11 and the screw attachment that has adopted the band chute connecting of last pickup arm 4, like this, can make on the bow-shaped arm 11 among Fig. 1 blade bearing 13 and above one three blade blade 14 can do the move left and right adjustment, with the difference of the green diameter that adapts to sample.

The finished product that the used resistance strain gage 7 of the utility model can adopt market to sell, other parts can only be made with metal.Measurement gauge length of the present utility model is 25-200mm, and the diameter of tested sample is 6-12.7mm.

Claims

1, bilateral electronics tens(i)ometer, comprise connection seat (5), flexible member (6), last pickup arm (4), sample (15), following pickup arm (8), blade bearing (13), resistance strain gage (7), it is characterized in that: the described slide rail of going up pickup arm (4) cooperates with the chute of bow-shaped arm (11) and uses screw in compression, the right-hand member of bow-shaped arm (11) is walked around sample (15), bow-shaped arm (11) is installed blade bearing (13) above the right-hand member, three blade blades (14) are installed above the blade bearing (13), the middle cutting edge of these piece three blade blades (14) contacts with the bus on the right side of sample (15), another blade bearing of following installation (13) of following pickup arm (8), another piece three blade blades (14) are installed below this blade bearing (13), cutting edge contacts with the left side bus of sample (15) in the middle of it, promptly be will experience two three blade blade arrangement of sample (15) elongation on two symmetrical buses of the axis of sample (15) both sides and sample (15), and contact with the xsect at sample marking distance two ends respectively; Drag hook sliding sleeve (3) with fixture of the spring is pressed on three blade blades (14) on the sample (15).

2, bilateral electronics tens(i)ometer according to claim 1 is characterized in that: three blades of described three blade blades (14) are on same straight line.

3, bilateral electronics tens(i)ometer according to claim 1 is characterized in that: the arc object of the integral body that described bow-shaped arm (11) is made up of three straight-arms, an angle is arranged between the adjacent straight-arm, and the optimum value of angle is 90 °.

4, bilateral electronics tens(i)ometer according to claim 1 is characterized in that: described fixture of the spring is made up of clamping cap (1), compression spring (2), drag hook sliding sleeve (3) and the little axle (12) that leads.

5, bilateral electronics tens(i)ometer according to claim 1 is characterized in that: two drag hooks on the described drag hook sliding sleeve (3) respectively have a V-shaped groove.