CN100578189C - Horizontal Young modulus measuring instrument - Google Patents

Abstract

This invention relates to a kind of horizontal type Young's modulus measuring apparatus. The invention has a horizontal type structural framework. on top of framework one side has one collect used for fix need measuring wire, another end of wire fixed by another horizontal type installed ambulatory splint(5). Ambulatory splint (5) also permanent connect with one measuring element's thief rod. The other end of thief rod (6) attach flexibility component; flexibility component attach a suit of weight aggregative device bypass pulley.

Description

Horizontal Young modulus measuring instrument

Affiliated field

The present invention relates generally to a kind of physical measuring instrument, particularly a kind of horizontal Young modulus measuring instrument of measuring metal wire rod stress deformation amount.

Background technology

Experimental principle according to Hooke's law points out that metal wire rod is in elastic limit, and elastomeric stress and strain is directly proportional.Be provided with a long L of being, cross-sectional area is the tinsel of S, elongation Δ L under external force F effect, then $\frac{F}{S}=E\frac{\mathrm{\ΔL}}{L},$ Scale-up factor E in the formula is called Young modulus.If used wire diameter is d in the experiment, then

To get after this formula substitution following formula arrangement:

Following formula shows, for length L, under the diameter d situation identical with adding external force F, elongation Δ L wiry was little when Young modulus E was big, thereby Young modulus has been expressed metal material opposing external force and produced and stretch or the ability of compression set.

Chinese invention patent, number of patent application is: ZL02133511.7 discloses a kind of Inversed measuring instrument of elastic modulus, be vertical structure, on as the column that supports, be combined with upper grip and lower chuck, lower chuck is fixed, fix tinsel to be measured between the last lower chuck, upper grip is linked to each other with one group of counterweight that cooperates with pulley by a metal cord, deflection after tinsel is stressed is measured by having optical system such as telescopical optical lever, the weak point of this instrument is that the scale that will more clearly see ruler in telescope must have two operators to cooperate, one people is responsible for observation telescope, an other people is responsible for regulating the reflective mirror on the optical lever, because instrument is thin and tall, and too high easy unstability that counterweight is liftoff, break as tested tinsel, counterweight falls down the uneasy congruence of hurting sb.'s feelings easily.

The instrument of another known measurement Young modulus is the CCD modulus measurer, is fully a kind ofly to form measuring system by electronic device, and described system comprises microscope, ccd video camera, monitor, magnet base etc., described installation cost is obviously higher, and measuring error is big, regulates difficulty.

Summary of the invention

The object of the present invention is to provide one can overcome the known technology shortcoming, with low cost, easy to operate, the horizontal Young modulus measuring instrument that measuring accuracy is high.

For achieving the above object, scheme of the present utility model is: described measuring instrument has the frame of a horizontal type structure, the chuck of one fixing fixed position wiry to be measured is arranged at the top of frame one side, the other end wiry is fixed by another horizontally-mounted active chuck, active chuck is also fixedlyed connected with the sounding rod of a measuring sensor, the other end of sounding rod links to each other with flexible member, and flexible member walks around pulley and a cover counterweight increases the weight of device and links to each other.

Adopt such scheme, measure the stressed distortion that produces of tinsel and undertaken, do not need setting to cost an arm and a leg, debug cumbersome electronic equipment or optical instrument, thereby overcome the deficiency of prior art, realized purpose of the present invention by the very high measuring sensor of precision.

Below in conjunction with diagram and embodiment scheme is described in more detail.

Description of drawings

Fig. 1 is the front view of horizontal Young modulus measuring instrument;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is the A-A cut-open view among Fig. 1;

Fig. 4 is the stressed sketch of measuring principle among Fig. 1.

Embodiment

Described as shown in Figure 1 is by the designed measuring instrument of scheme, and a horizontally-mounted frame is arranged, and frame is combined to form by two blocks of side plates 1 and three connecting links of arranging in a triangle 2, and the arrangement of the shape of side plate 1 and connecting link 2 is seen clearlyer by Fig. 3.Connecting link 2 is attacked a Kong Houyong bolt tightening that side plate 1 is pierced at the two ends of mouth.The upper end of the horizontal framework that forms is equipped with chuck, one end of tinsel 3 to be measured is fixed by a fixed chuck, described fixed chuck is actually and flexibly connects a block pressur plate 4 in the upper surface of side plate, the other end of tinsel 3 is fixed by a horizontally-mounted active chuck 5, active chuck 5 also links to each other with the sounding rod 6 of a measuring sensor, connected mode is to cooperate with the screw rod of sounding rod 6 ends with the bolt hole on the active chuck 5, or the end of sounding rod 6 cooperates with hole on the active chuck 5 again and tightens up with screw, the other end of sounding rod 6 links to each other with a flexible member such as thin steel rope 8 by a chuck 7, and steel cable 8 is walked around pulley 9 and and overlapped counterweight and increase the weight of device 10 and link to each other.Form afterburner system wiry to be measured by said apparatus, on frame, also be fixed with a holder 11 with the fixation measuring element, the measuring sensor of the tinsel deflection Δ L that present embodiment uses is a clock gauge 12 commonly used in the metal processing, mounting pipe on the watchcase of clock gauge 12 is fixing by clock gauge holder 11, holder 11 location are fastened in three frame connecting links of arranging in a triangle 2 and are positioned on the top connecting link, the clock gauge measurement range of present embodiment is 0-20mm, precision 0.001mm, the clock gauge of the multiple model that meets this requirement all can use.Certainly with dial gauge also can, this will look the height of experimental precision and determine.

Active chuck 5 is made up of two block pressur plates 13, connect by bolt, wherein porose on the block pressur plate so that tinsel to be measured compresses with pressing plate after passing again, it is a tolerance benchmark wiry to be measured that connection between two block pressur plates 13 is seamed into, be provided with a slide calliper rule slide 14, being positioned at a top connecting link 2 in the frame connecting link that has the Kong Yusan root of scale and tubulose to arrange in a triangle on the slide calliper rule slide 14 cooperates, and can move along bar 2, the meter ruler of tolerance length is also posted on the surface that is positioned at a top connecting link 2, cooperates with meter ruler on the connecting link 2 by slide calliper rule slide 14 and can measure original length L wiry.

Be the pulling force system schematic that is subjected to wiry as described in Figure 4, this is with measuring sensor clock gauge 12 designs simplifications among Fig. 1, fixedlyed connected with a chuck 7 by active chuck 5 respectively in the two ends of a sounding rod 6, therefore tinsel 3 to be measured and sounding rod 6 are to be in the same stressed system, and the watchcase of clock gauge 12 is promptly measured the indication mechanism position and is fixed, the amount of movement of sounding rod 6 is promptly represented the deflection Δ L of tinsel 3 to be measured, the clock gauge indication mechanism can be come out the subtle change of sounding rod 6 by the dial plate readings signify, so it is easily convenient to observe, the shape of dial plate is seen clearlyer by Fig. 2.

Press the measuring instrument that such scheme is installed, during use one section wiry to be measured is fixed between fixed chuck 4 and the active chuck 5, and increase the weight of by counterweight, metal wire to be measured is stretched, mobile slide calliper rule slide 14 makes scale aim at the seam on the active chuck 5 and measures effective length L wiry to be measured at this moment, and the dial plate that rotates clock gauge makes it to " 0 ", at this moment continue to add counterweight, counterweight quality m be multiply by g obtain afterburning F, the deflection Δ L of metal wire is read by clock gauge, and measure diameter d wiry to be measured, calculate E in the formula that the substitution of gained parameter is above-mentioned.This device is owing to horizontal type structure, and floor area is little, adjusts easily, and experimental precision is also high, and effective length wiry to be measured can satisfy requirement of experiment, and the cost of device is very low, is to very big improvement of known technology.

Claims (6)

1, horizontal Young modulus measuring instrument, it is characterized in that: described measuring instrument has the frame of a horizontal type structure, the chuck of the fixed position of one fixing tinsel to be measured (3) is arranged at the top of frame one side, the other end of tinsel (3) is fixing by another horizontally-mounted active chuck (5), active chuck is also fixedlyed connected with the sounding rod (6) of a measuring sensor, the other end of sounding rod (6) links to each other with flexible member, and flexible member walks around pulley and a cover counterweight increases the weight of device and links to each other.

2, horizontal Young modulus measuring instrument according to claim 1 is characterized in that: frame is combined to form by two blocks of side plates (1) and three connecting links of arranging in a triangle (2).

3, horizontal Young modulus measuring instrument according to claim 1 is characterized in that: active chuck (5) is made up of two block pressur plates (13), connects by bolt, and wherein a block pressur plate two is porose.

4, horizontal Young modulus measuring instrument according to claim 3, it is characterized in that: be provided with a slide calliper rule slide (14), being positioned at a top connecting link (2) in the frame connecting link that has the Kong Yusan root of scale and tubulose to arrange in a triangle on the slide calliper rule slide (14) cooperates, and can move along bar (2), the meter ruler of tolerance length is also posted on the surface that is positioned at a top connecting link (2).

5, horizontal Young modulus measuring instrument according to claim 1 is characterized in that: described measuring sensor is a clock gauge (12).

6, horizontal Young modulus measuring instrument according to claim 5, it is characterized in that: the mounting pipe on the watchcase of clock gauge (12) is fixing by clock gauge holder (11), and holder (11) location is fastened in three frame connecting links of arranging in a triangle (2) and is positioned on the top connecting link.

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