CN203117141U

CN203117141U - Sample rack for cone calorimeter

Info

Publication number: CN203117141U
Application number: CN 201320125529
Authority: CN
Inventors: 王俊胜; 刘丹; 王国辉; 于东兴
Original assignee: Tianjin Fire Fighting Institute Ministry of Public Security
Current assignee: Tianjin Fire Fighting Institute Ministry of Public Security
Priority date: 2013-03-19
Filing date: 2013-03-19
Publication date: 2013-08-07
Anticipated expiration: 2023-03-19

Abstract

The utility model discloses a sample rack for a cone calorimeter. The sample rack comprises a base, wherein a handle is arranged at one side of the base; an elastic bracket is placed on the base, and consists of a tray and a plurality of springs on the lower side of the tray; an outer framework is arranged on the periphery of the elastic bracket; an inner edge plate is arranged at the top of the outer framework; the bottom of the outer framework is fixed with the base; jack screws are arranged at the bottom of the lateral wall of the outer framework; and the outer framework and the base are fixed through the jack screws. With the adoption of the sample rack provided by the utility model, the influence that the thermal radiation intensity receivedby a sample becomes smaller, caused by that the sample is heated and contracted to be far from a radiation cone, can be removed, so that the thermal radiation intensity received by the sample keeps the same in a test process. Therefore, the test accuracy is greatly improved; the stability and the repeatability of test data can be ensured; and the sample rack for the cone calorimeter has the advantages of convenience in operation and low manufacturing cost.

Description

A kind of taper calorimeter specimen holder

Technical field

The utility model relates to a kind of auxiliary of taper calorimeter, relates in particular to a kind of taper calorimeter specimen holder.

Background technology

The taper calorimeter is that National Institute of Standards and Technology (NIST) is in small scale (bench-scale) the fire test device that is used for the material combustion performance of early eighties exploitation in last century.The taper calorimeter can the many-sided fire burning performance of test material through nearly 30 years practice and perfect.The maximum characteristics of taper calorimeter are by the heat flow rate per unit area in the taper well heater simulated fire, and material is burnt under accurate fire condition, simultaneously the HRR of test material, every burning performance parameters such as productive rate of burning gases.Because the burning behavior of material has reasonable correlativity in taper calorimeter test figure and the natural fire, and the test of taper calorimeter has advantages such as simple to operate, with low cost, therefore, the taper calorimeter in the application of research field such as Fire Science, fire engineering, material be fire-retardant more and more widely.

By GB/T16172-2007(building materials HRR test method) middle requirement, the taper calorimeter needs with heat flow meter the radiation intensity of radiant cone is demarcated a certain fixedly radiation intensity before testing, as: 50kW/m ²Heat flow meter is placed on apart from radiant cone lower surface 25mm place; In when test, usually sample is positioned on the specimen holder that is positioned at the plummer top, and requires the surface of sample to be parallel to the lower surface of taper well heater, and both 25mm apart.When the thermoplastic foam of industry widespread uses such as building, electric and chemical industry is tested, because, this class material can shrink rapidly when being heated, though this class sample thickness is generally 20-50mm in the test of taper calorimeter, but after sample is heated, its thickness can shrink rapidly from 20-50mm, and be reduced to the bottom of specimen holder, cause the hot irradiation intensity of the actual hot irradiation intensity that is subjected to of material and demarcation to have big gap, test figure poor repeatability, the confidence level of acquisition are not high.Therefore, need a kind of novel specimen holder of exploitation, to guarantee when testing thermoplastic foam, can to make sample position remain at radiant cone lower surface 25mm place in whole combustion process.

The utility model content

At above-mentioned prior art, the utility model provides a kind of taper calorimeter specimen holder, can solve existing taper calorimeter specimen in use frame and can't when sample is subjected to thermal shrinkage, can not keep sample surfaces apart from the problem of radiant cone distance, the utility model specimen holder is easy to operate, cost of manufacture is cheap, and assemble easyly, the user can fit together parts such as sample frame, specimen holder base and elastic bracket and form the taper calorimeter quickly and easily with the one-piece construction of specimen holder.

In order to solve the problems of the technologies described above, a kind of taper calorimeter of the utility model with the technical scheme that specimen holder is achieved is: this specimen holder comprises base, be placed with an elastic bracket on the described base, described elastic bracket is made of pallet and a plurality of springs that are arranged on described pallet below, the periphery of described elastic bracket is provided with an outside framework, along plate, the bottom of described outside framework and described base were fixed in the top of described outside framework was provided with.

The utility model taper calorimeter specimen holder, wherein, a side of described base is provided with handle.The bottom that is positioned at described outside framework sidewall is provided with jackscrew, is fixed by described jackscrew between described outside framework and the described base.

Compared with prior art, the beneficial effects of the utility model are:

Because be provided with elastic bracket in the utility model specimen holder, during test, sample is placed on the elastic bracket, sample elastic bracket when being subjected to thermal shrinkage can guarantee that sample surfaces remains unchanged apart from the distance of radiant cone.Utilize the utility model specimen holder, can eliminate the influence that sample is subjected to thermal shrinkage to cause sample thermal radiation intensity to diminish away from radiant cone, the caloradiance that sample is subjected in the assurance test process consistently, test accuracy improves greatly, and the cost of making this specimen holder is low, easy to operate, good reproducibility.

Description of drawings

Fig. 1 is the front view that the utility model taper calorimeter is used specimen holder;

Fig. 2 is the vertical view of specimen holder shown in Figure 1;

Fig. 3 is the stereographic map of specimen holder shown in Figure 1;

Fig. 4 is the HRR curve map that utilizes the utility model specimen holder and the test of prior art specimen holder.

Among the figure:

1-outside framework, 2-handle, 3-base

4-pressure spring, 5-jackscrew, 6-pallet

7-interior along plate

Embodiment

Below in conjunction with embodiment the utility model is done to describe in further detail.

As Fig. 1, Fig. 2 and shown in Figure 3, a kind of taper calorimeter of the utility model specimen holder, comprise base 3, one side of described base 3 is provided with handle 2, be placed with an elastic bracket on the described base 3, described elastic bracket is made of pallet 6 and a plurality of springs 4 that are arranged on described pallet 6 belows, in order to guarantee the steady of pallet 5, the number of spring 4 preferably more than three, has illustrated the structure with four springs among Fig. 2; The periphery of described elastic bracket is provided with an outside framework 1, the top of described outside framework 1 is provided with interior along plate 7, the bottom of described outside framework 1 and described base 2 are fixing, and the bottom that is positioned at described outside framework 1 sidewall is provided with jackscrew 5, are fixed by described jackscrew 5 between described outside framework and the described base 3.

In order to guarantee in test process, the distance of sample surfaces and radiant cone remains unchanged, to control the height and position of sample surfaces in the outside framework along the height and position of plate bottom surface, therefore, in the test process, under the effect of pressure spring, make sample surfaces contact along the plate bottom surface all the time with in the outside framework, thereby guaranteed that the height and position of sample surfaces is constant before and after the distortion.

The use of the utility model specimen holder is: at first, with aluminium-foil paper sample other surface except upper surface is coated; Then, elastic bracket is placed on the base 3, sample after coating is put to the pallet 6 of elastic bracket, after putting outside framework 3, push down sample with the interior of outside framework 3 along plate 7, with jackscrew 6 that outside framework 1 is fixing with base 3, before fixing, push down sample downwards, the pressure spring 4 stressed compressive states that are in; At last, the specimen holder that is placed with sample is placed on the taper calorimeter test board, undertaken and finish test by standard program, in the test process along with the drawdown deformation of sample, under the effect of pressure spring tension force, sample surfaces contacts with interior bottom surface along plate all the time, and namely the distance of sample surfaces and radiant cone remains unchanged.

The quantity of the shape of elastic bracket and pressure spring only is used for illustrating in the utility model, and those skilled in the art can design and adjust according to actual conditions, and the utility model does not limit this.

Fig. 4 shows HRR(HRR-time of utilizing the utility model specimen holder and the test of prior art specimen holder to obtain) curve map, can draw from Fig. 4: the burning time of sample is obviously short than the time of using original specimen holder when using the test of the utility model specimen holder, and the peak value of HRR curve is also big than what use original specimen holder to test, therefore, light when using the utility model specimen holder not only can reflect material combustion more accurately and parameter such as HRR, and the data that obtain can more real exosyndrome material fire risk, the fine problem that exists when having avoided using original specimen holder test.

Although be described in conjunction with the utility model of figure above; but the utility model is not limited to above-mentioned embodiment; above-mentioned embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; under the situation that does not break away from the utility model aim, can also make a lot of distortion, these all belong within the protection of the present utility model.

Claims

1. taper calorimeter specimen holder, comprise base (3), it is characterized in that, described base is placed with an elastic bracket on (3), described elastic bracket is made of pallet (6) and a plurality of springs (4) of being arranged on described pallet (6) below, the periphery of described elastic bracket is provided with an outside framework (1), and along plate (7), the bottom of described outside framework (1) and described base (2) were fixing in the top of described outside framework (1) was provided with.

2. according to the described taper calorimeter of claim 1 specimen holder, it is characterized in that a side of described base (3) is provided with handle (2).

3. according to the described taper calorimeter of claim 1 specimen holder, it is characterized in that the bottom that is positioned at described outside framework (1) sidewall is provided with jackscrew (5), fixing by described jackscrew (5) between described outside framework and the described base (3).