CN2208229Y

CN2208229Y - Tension releasing tester

Info

Publication number: CN2208229Y
Application number: CN 94238328
Authority: CN
Inventors: 姜许民
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-09-30
Filing date: 1994-09-30
Publication date: 1995-09-20
Anticipated expiration: 2004-09-30

Abstract

The utility model relates to a mechanical device, particularly an A type tension releasing tester, comprising a straining bolt, a flat circular plate, a clamp nut, a cushion ring connecting sleeve, a dial indicator, etc. The hollow hole of the straining bolt is a convex step hole. The shape of a pushing rod is corresponding to the hollow hole. The head of the pushing rod directly pushes the indicator head of the dial indicator upwards. A spring sleeve is arranged between a fixing screw and the locating column of the dial indicator. The surface of the spring sleeve is provided with a longitudinal slot, and the outer surface is provided with a lateral slot. The spring sleeve is also provided with a longitudinal opening. The utility model has the advantages of simple structure, convenient use and low cost. The utility model can be processed by home-made universal equipment. The error rate can be reduced.

Description

Tension releasing tester

The utility model relates to a kind of plant equipment, particularly a kind of A type stress relaxation analyzer.

Test method A among the national standard pipe flange pad stress relaxation test method GB/12621-90 and with its corresponding Unite States Standard (USS) Standard Test Methids for creep Relaxa-tion of a gasket Meterial ASTMF38-80 in test method B, Nippon Standard J1SR3453 provides in addition part figure of the synoptic diagram of stress relaxation measurement mechanism and part, be that ASTMF38-80 provides wherein as Fig. 2, its principle of work is reasonably, but above-mentioned standard adopts the stress relaxation analyzer all to exist following shortcoming:

1, the shortcoming of strain bolt existence

φ 2.65 long 69.85 apertures are arranged in the middle of the strain bolt, its slenderness ratio L/d=26.46, belong to the very big Small-deep Hole of slenderness ratio, its internal diameter has the requirement of cooperation with the outer garden of push rod face, so the dimensional tolerence of aperture, the straight edge degree, Geometrical Tolerance Principle height such as right alignment are the biggest problem in the processing, and rejection rate is big, the processing cost height, and equipment needed thereby needs from external import.

2, the shortcoming of coupling sleeve existence

Know by Fig. 2, sensing element is housed in the coupling sleeve, the stroke of strain bolt when being subjected to tension variations passed to the clock gauge gauge outfit, from the clock gauge structure as can be known, gauge outfit itself is exactly an accurate sensing element, therefore existing sensing element is unnecessary, has caused a unnecessary measuring error, should be cancelled.

Secondly, gib screw directly withstands on garden, the location outer surface of column (aperture is arranged in the middle of it, and the slide bar clearance fit with gauge outfit is installed moves up and down gauge outfit flexibly) of clock gauge among Fig. 2, if push up to such an extent that tension makes the thin-walled Internal Hole Deformation of garden, location post, cause the upper and lower motion of slide bar and gauge outfit dumb, increase measuring error, even press from both sides dead gauge outfit, if push up to such an extent that adorn inadequately, loosening easily in measuring process, make the shake of clock gauge pointer, increased measuring error.

The purpose of this utility model is to provide the stress relaxation analyzer that a kind of processing simple in structure, easy to use, easy, cost are low, can reduce error rate.

For achieving the above object, the utility model adopts following technical scheme: it passes through the middle hole of flat plectane with clamp nut with the strain bolt, packing rings etc. link together, the coupling sleeve bottom is threaded with the strain bolt head, clock gauge is installed with gib screw in its top, the built-in push rod of strain bolt hollow hole, it is characterized in that: strain bolt hollow hole is holes, protruding rank, push rod shape and hollow hole are corresponding, the head of push rod directly withstands the gauge outfit of clock gauge, establish a spring housing between the positioning cylinder of gib screw and clock gauge, the surface of spring housing has cannelure, and outside surface has transverse groove, and spring housing also has a longitudinal opening.The lower end of above-mentioned push rod and strain bolt hollow hole lower end are transition fit, hold out against the lower end of push rod with screw in the side.Cannelure (11) is more than two.

The utility model compared with prior art has following advantage:

1, the coupling sleeve after the improvement has been cancelled the sensing element on the U.S., Japan and China's national standard design drawing, has got rid of the measuring error that swing caused of this sensing element in measuring process, thereby has improved the measuring accuracy of analyzer.

2, the strain bolt arrangement design after improving has improved manufacturability, can be with rationally arranging processing technology, process qualified other part with homemade general precision machine tool and cutter, and avoided the equipment investment of hundreds of thousands unit.

3, owing to the compact conformation of coupling sleeve, the processing technology of strain bolt is improved, and makes its production cost reduce 40-50% at least, and it is compared with similar import instrument, has reduced more than 50% at least.

4, the use of spring housing can make clock gauge positioning cylinder clamping area big, stressed even, so clamp firm, reliable.

Fig. 1 is the utility model structural representation;

The stress relaxation analyzer structural representation that Fig. 2 adopts for ASTMF38-80;

Fig. 3 is a part spring housing structural representation among Fig. 1;

Fig. 4 is Fig. 3 side view.

The utility model is described in further detail below in conjunction with accompanying drawing:

As Fig. 1, shown in Figure 2, the utility model basic structure adopts prior art, promptly use strain bolt (9) to pass through the middle hole of flat plectane (8) with clamp nut (4), packing ring (5) etc. links together, coupling sleeve (3) bottom is connected with strain bolt (9) head threads, clock gauge (1) is installed with gib screw (2) in its top, the built-in push rod of strain bolt (9) hollow hole (7), strain bolt (9) hollow hole is holes, protruding rank, push rod (7) shape is corresponding with hollow hole, the head of push rod (7) directly withstands the gauge outfit of clock gauge (1), establish a spring housing (10) between the positioning cylinder of gib screw (2) and clock gauge (1), the surface of spring housing (10) has three cannelures (11), outside surface has transverse groove (12), and spring housing (10) also has a longitudinal opening (13).

When the utility model uses, tested test piece (6) is clipped between two flat plectanes (8), with clamp nut (4), packing ring (5) and strain bolt (9) are linked to be together by the hole in the middle of the flat plectane (8), when fastening nut (4) arrives to a certain degree, make between two flat plectanes (6), produce 26.67KN pressure, (6000 pounds) compress test piece 6, partly (its length l=50mm) be subjected to the 26.67KN pulling force and its length is extended, its elongation is Δ l also to make simultaneously strain bolt (9) between strain bolt head (9) circular bead surface and the nut (4) ₁Therefore, the head of strain bolt (9) and with adapter sleeve 3 clock gauges (1) that it the fuses Δ l that raises ₁But the inside surface of aperture is gapped in the middle of push rod (7) and the strain bolt (9), and the two can be slided relatively, so push rod (7) is not subjected to pulling force, and its end face keeps origin-location, as clock gauge (1) rising Δ l ₁The time, gauge outfit is stretched out Δ l downwards owing to inner spring force ₁, and drive pointer, make the clock gauge reading by initial value D _{First 1}Become D ₁Be elongation Δ l ₁=D ₁-D _{First 1}, this shows Δ l ₁Value can be measured with lucky submeter.

With the analyzer after clamping, unload clock gauge (1), coupling sleeve (3), remainder is sent into baking oven and is warmed to 100 ± 2 ℃, is incubated after 22 hours cool to room temperature, owing to test piece at high temperature pressurized produced deformation in 22 hours, make its part elastic deformation be converted into plastic yield and build-up of pressure decline, the suffered pulling force of strain bolt (9) is less than 26.67KN, and its elongation is Δ l ₂, Δ l ₂＜Δ l ₁, Δ l ₂Measuring method as follows: clock gauge (1) coupling sleeve (3) is installed to the head of strain bolt (9) again, and make clock gauge (1) gauge outfit that individual top decrement be arranged, its initial reading is D _{First 2}After being totally released nut (4), strain bolt (9) stressed is zero, instant deflection by original (before unclamping〉Δ l ₂Become 0 and clock gauge (1) is descended, keep the origin-location, force the clock gauge gauge outfit to be compressed and take the lead the clock gauge pointer by initial reading D at push rod (7) end face _{First 2}Become D ₂, Δ l ₂=D ₂-D _{First 2}, stress relaxation rate f is calculated as follows: f=Δ l ₁-Δ l ₂/ Δ l ₁

Claims

1, a kind of stress relaxation analyzer, it passes through the middle hole of flat plectane with clamp nut with the strain bolt, packing rings etc. link together, the coupling sleeve bottom is threaded with the strain bolt head, clock gauge is installed with gib screw in its top, the built-in push rod of strain bolt hollow hole, it is characterized in that: strain bolt (9) hollow hole is holes, protruding rank, push rod (7) shape is corresponding with hollow hole, the head of push rod (7) directly withstands the gauge outfit of clock gauge (1), establish a spring housing (10) between the positioning cylinder of gib screw (2) and clock gauge (1), the surface of spring housing (10) has cannelure (11), outside surface has transverse groove (12), and spring housing (10) also has a longitudinal opening (13).

2, stress relaxation analyzer according to claim 1 is characterized in that: the lower end of push rod (7) and strain bolt (9) hollow hole lower end are transition fit, hold out against the lower end of push rod (7) with screw (14) in the side.

3, stress relaxation analyzer according to claim 1 and 2 is characterized in that: cannelure (11) is more than two.