CN202453263U - Three-point bending stress tester for thermal shock resistance tests of refractory products - Google Patents

Abstract

The utility model relates to a three-point bending stress tester for thermal shock resistance tests of refractory products, belonging to the technical field of refractory material detection. The bending stress tester for thermal shock resistance tests of refractory products is characterized by comprising a rectangular loading plate and a support base, wherein two upper tool edges in parallel to each other are formed on the two sides of the lower part of the rectangular loading plate; a lower tool edge is formed at the middle part of the support base; and the lower tool edge is located in a vertical plane of the center line of the two upper tool edges. The three-point bending stress tester for thermal shock resistance tests of refractory products is simple in structure, low in fabrication cost, convenient for assembly and operation, and also accurate and stable in testing results.

Description

The test of refractory product thermal shock resistance is with three-point bending stress test device

Technical field

The utility model relates to a kind of refractory product thermal shock resistance test with three-point bending stress test device, belongs to the test of refractories technical field.

Background technology

" the iron and steel industry industry standard YB/T 376.2-1995 of the People's Republic of China (PRC) " adopts the air quenching method, and its refractory product that is suitable for is following: be difficult to the refractory product of judging that thermal shock resistance is good and bad like alkaline refractory product, silica fire resistant goods, founding refractory product, total porosity less greater than 45% refractory product and with water interaction or water quick cooling method thermal shock number of times.The air quenching ratio juris is under the test temperature of regulation and pressurized air stream quenching medium; The sample of definite shape and size is after the temperature jump that stands rapid heat cycle; When rupturing or jetting explosion through applying bending stress; The rapid heat cycle cycle index that is experienced is confirmed the thermal shock resistance of refractory product.

The test of bending stress need be realized that the three-point bending device is made up of parallel each other two last edges of a knife and a following edge of a knife by the three-point bending device, and the radius-of-curvature of the edge of a knife is 5 ± 0.5mm.The following edge of a knife is positioned at two to be gone up on the edge of a knife center line, and off-center is not more than ± 2mm.Two spacings that go up the edge of a knife are 100 ± 1mm.

When the anti-folding equipment of routine that carries out the three-point bending stress test in the prior art made an experiment to being in sample under the condition of high temperature, have following problem: equipment investment was big, and the installation of sample, adjustment time are long; Difficult problems such as personnel safety guard's facility is poor, the loading dynamics is wayward.

Summary of the invention

According to above deficiency of the prior art; The technical matters that the utility model will solve is: provide a kind of refractory product thermal shock resistance test with three-point bending stress test device, this apparatus structure is simple, low preparation cost; Be convenient to assembling and operation, test result is accurately stable.

The utility model solves the technical scheme that its technical matters adopted:

Described refractory product thermal shock resistance test is with three-point bending stress test device; Its characteristics are: comprise rectangle loading plate and base for supporting composition; The both sides of said rectangle loading plate bottom are provided with two last edges of a knife that are parallel to each other; Said base for supporting middle part is provided with down the edge of a knife, and the following edge of a knife is positioned at two vertical planes of going up the center line place of the edge of a knife.

On four angles of described rectangle loading plate bottom supporting leg is set respectively.The height of supporting leg is the height between rectangle loading plate and the base for supporting during less than sample testing.In the device that installs sample, supporting leg is vacant state.The effect of supporting leg mainly contains following 2 points: 1, be convenient to two parts alignment assembling up and down; 2, when carrying out the porosity greater than 45% fire-resistant specimen test, sample is broken suddenly sometimes under the load pressure effect, causes loading panel tilt drop, and this moment, supporting leg can play supporting role timely, protected the upper and lower edge of a knife.

During use sample being placed on the base for supporting, placing rectangle loading plate then on sample top, bears a heavy burden and gets final product in rectangle loading plate top.

The standard code maximum stress in bend must not surpass 0.3Mpa, otherwise the breakage that causes thus is regarded as cancelling.And can guarantee that sample behind pressurized air stream chilling, comprises the time of bending stress test, at room temperature must not place standard-required above 3min.

This device adopts fixed load, according to the bending stress computing formula

$\mathrm{Re}=\frac{3F\max \&CenterDot;\mathrm{<figure-callout\; id="2"\; label="Ls"\; filenames="HDA0000139067500000011.png"\; state="\{\{state\}\}">Ls</figure-callout>}}{{2\mathrm{<figure-callout\; id="2"\; label="bh"\; filenames="HDA0000139067500000011.png"\; state="\{\{state\}\}">bh</figure-callout>}}^2}\&times;{10}^3$

Wherein Re is bending stress (Mpa);

Fmax is load (KN);

Ls is edge of a knife spacing (mm), Ls=100mm in this device;

B is specimen width (mm), b=64mm in this test;

H is specimen height (mm), h=64mm in this test;

When maximum stress in bend was 0.3Mpa, maximum load was 0.524kN, promptly was equivalent to 53.5 kilograms, can join foot with several iron stone rollers, was superimposed on the loading face one by one during test to get final product.The simplest method is to let people's (can carry the object of constant weight during shortage in weight, gather together enough 53.5 kilograms) of 53.5 kilograms of individual weights stand on loading face with monopodia gently, and the suffered bending stress of sample this moment is 0.3Mpa.

The beneficial effect that the utility model had is:

The utility model is not only simple in structure, and low preparation cost is convenient to assembling and operation, and test result is accurate, stable.

Description of drawings

Fig. 1 is the utility model structural representation.

Among the figure: 1, rectangle loading plate; 2, go up the edge of a knife; 3, base for supporting; 4, the following edge of a knife; 5, supporting leg.

Embodiment

Below in conjunction with accompanying drawing the embodiment of the utility model is done and to further describe:

As shown in Figure 1; Described refractory product thermal shock resistance test is with three-point bending stress test device; Its characteristics are: comprise rectangle loading plate 1 and base for supporting 3 compositions; The both sides of said rectangle loading plate 1 bottom are provided with two last edges of a knife 2 that are parallel to each other, and said base for supporting 3 middle parts are provided with down the edge of a knife 4, and the following edge of a knife 4 is positioned at two vertical planes of going up the center line place of the edge of a knife 2.

Described device is formed by 10mm thick steel plate and the thick reinforcing bar welding production of diameter 10mm.Forms by two parts up and down, i.e. rectangle loading plate 1 and base for supporting 3 compositions, profile is roughly cuboid, is of a size of: long 200mm, wide 18mm, high 8mm; The three-point bending device is made up of parallel each other two last edges of a knife 2 and a following edge of a knife 4, and the radius-of-curvature of the edge of a knife is 5 ± 0.5mm.The following edge of a knife 4 is positioned at two to be gone up on the edge of a knife 2 center lines, and off-center is not more than ± 2mm.Two spacings that go up the edge of a knife 2 are 100 ± 1mm.The edge of a knife all is to process with the thick reinforcing bar of diameter 1mm up and down.Because the geomery of the fire resistive material sample of YB/T376.2-1995 regulation is (114 ± 3) mm * (64 ± 2) mm * (64 ± 2) mm rectangle sample; So the inner width of this device design is for being slightly larger than 114mm; Get 120mm; So both conveniently be in picking and placeing of sample under the condition of high temperature, and can have kept the stable of sample again preferably, limited the swing that only is in a sample on the edge of a knife.

On four angles of described rectangle loading plate 1 bottom supporting leg 5 is set respectively.The height of supporting leg 5 is the height between rectangle loading plate 1 and the base for supporting 3 during less than sample testing.In the device that installs sample, supporting leg 5 is vacant state.The effect of supporting leg 5 mainly contains following 2 points: 1, be convenient to two parts alignment assembling up and down; 2, when carrying out the porosity greater than 45% fire-resistant specimen test, sample is broken suddenly sometimes under the load pressure effect, causes rectangle loading plate 1 tilt drop, and this moment, supporting leg 5 can play supporting role timely, protected the upper and lower edge of a knife.

During use sample being placed on the base for supporting 3, placing rectangle loading plate 1 then on sample top, bears a heavy burden and gets final product in rectangle loading plate 1 top.

The standard code maximum stress in bend must not surpass 0.3Mpa, otherwise the breakage that causes thus is regarded as cancelling.And can guarantee that sample behind pressurized air stream chilling, comprises the time of bending stress test, at room temperature must not place standard-required above 3min.

When maximum stress in bend was 0.3Mpa, maximum load was 0.524kN, promptly was equivalent to 53.5 kilograms, can join foot with several iron stone rollers, was superimposed on the loading face one by one during test to get final product, and the suffered bending stress of sample this moment is 0.3Mpa.

The utility model is not only simple in structure, and low preparation cost is convenient to assembling and operation, and test result is accurate, stable.

Claims (2)

1. a refractory product thermal shock resistance test is with three-point bending stress test device; It is characterized in that: comprise rectangle loading plate and base for supporting composition; The both sides of said rectangle loading plate bottom are provided with two last edges of a knife that are parallel to each other; Said base for supporting middle part is provided with down the edge of a knife, and the following edge of a knife is positioned at two vertical planes of going up the center line place of the edge of a knife.

2. refractory product thermal shock resistance test according to claim 1 is characterized in that: on four angles of described rectangle loading plate bottom supporting leg is set respectively with three-point bending stress test device.

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