Small-sized instrument for quick assessment of flame-proof properties of flame-proof timber treatment

FIELD: measurement equipment.

SUBSTANCE: invention proposes a small-sized instrument for quick assessment of flame-proof properties of flame-proof timber treatment, which consists of a housing made in the form of an open box-type profile, a specimen installation and positioning mechanism, a gas burner activation mechanism and a gas burner installation mechanism. An inclination angle of the specimen installation and positioning mechanism is unchanged relative to a vertical axis of the housing, and additionally, it includes a fixation device of an application point of flame to the specimen with a cut-out in the upper part of the device. All components of the instrument are installed in the cavity of the housing.

EFFECT: providing reliable test results.

4 dwg

 

The invention relates to experimental studies of fire-retardant treatment of wood and can be used to determine the quality of fire-retardant treatment directly on the work on fire protection of wooden structures.

Known small-sized portable device for rapid research of flame retardant properties and quality fire retardant treatment of wood (Patent RU 2302625 C2, publ. 10.07.2007 G., bull. No. 19), which was selected as a prototype. The portable device consists of a body, a rotary cover, gas burner and casing. The rotary cover is made with through slots in mounting locations and allows it to move relative to the housing, also has a locking mechanism angle covers.

The disadvantage of this device is the large number of arbitrarily changeable geometric factors for positioning of the sample relative to the burner. Such factors include: the possibility of choosing arbitrary rotation angle of the lid - allows you to arbitrarily change the angle of exposure to the burner flame on the sample, the presence of through slits in the lid - allows you to change the place of exposure to the burner flame to the sample. These shortcomings allow you to change the location of the geometric coordinates flame gas �of oralce relative to the sample. This leads to irregular changes in thermal impact of the flame on the sample that enters into the process of testing a subjective factor and leads to low reliability and nepovtorimosti test results. During the tests, the operator of the device is forced to manually adjust the position of the cover device with the established sample and turned on the burner. In this case it relates directly to the metal cover in the impact zone of the flame burner and can get severe burns.

The aim of the invention is to ensure the invariance of the geometric factors for positioning of the sample in the burner flame and, consequently, ensuring the reliability of the test results, as well as eliminating the risk of injury when using the device.

This object is achieved in that in small unit rapid assessment of flame retardant properties of fire-retardant treatment of wood, consisting of a body made in the form of an open box section, mechanism for inserting and positioning of the sample, the mechanism of activation of a gas burner, the setting mechanism of a gas burner, the tilt angle setting mechanism and positioning of the sample is made constant relative to the vertical axis of the housing and further comprises a fixation device of the point of application of the flame to the specimen with cutout�m in the upper part of the device and all of the components of the device installed in the body cavity.

Unchanged the angle of the mechanism for inserting and positioning of the sample allows to obtain an optimal and constant exposure to burner flame to the sample. The design of the fixing mechanism and the positioning of the sample ensures the optimal air gap between the casing surface and the rear surface of the sample. The mechanism for inserting and positioning of the sample with a special locking device of the point of application of the flame is a fixed point of contact of the burner flame and the sample (point zero). The specified device is a thin non-combustible (such as metal) plate of finite width and thickness with a cutout at the top. The device is installed in the lower part of the sample close to the front of the sample. The fixing device of the point of application of the flame is movable by a clamping frame of the mechanism for inserting and positioning the sample to fine tune exactly how the burner flame. When the deviation of the device from vertical locking device of the point of application of the burner flame is unable to continue the test. When bending to the side - the flame comes out of the neck of the device and into or on non-combustible plate fixing device and does not affect the sample, or the reduction of the heat of influence�e flame until the lack of heating the sample.

Such design of the device ensures the invariance of the geometric location of the point of contact of the burner flame and the sample during the test, which makes the mode of heat and mass transfer is stable, and significantly reduces the trauma of the device.

Fig.1 shows a small-sized instrument for the rapid assessment of flame retardant properties of fire-retardant treatment of wood in the working position, side view. Fig.2 shows the device in position, the view of the fixing device of the point of application of the flame 3, the mechanism of activation of the gas burner 5 installation mechanism 6 gas burners. Fig.3 shows a section b-B on the housing 1, the clamping frame 7, the support strips 8. mechanism for inserting and positioning of the sample 2, the fixing device of the point of application of the flame to the specimen 3. Fig.4 shows a view In on the clamping frame 7, the support strips 8 mechanism installation and positioning of the sample 2, the fixing device of the point of application of the flame to the specimen 3.

Small-sized instrument for the rapid assessment of flame retardant properties of fire-retardant treatment of wood consists of a housing 1, a mechanism for inserting and positioning of the sample 2, the fixing device of the point of application of the flame to the specimen 3, a gas burner 4, the mechanism of activation of the gas burner 5 installation mechanism 6 gas burners. The housing 1 is designed as an open box-shaped profile�, in the cavity of which is mounted all the parts of the device: a mechanism for inserting and positioning of the sample 2 with the clamping device of the point of application of the flame 3, the mechanism of activation and installation 5 gas burners.

The mechanism for inserting and positioning of the sample 2 is pivotally connected to the body 1 of the clamping frame 7 and made integral with the housing of the support strips 8. The mechanism for inserting and positioning of the sample 2 provides installation and positioning of the sample in some way with the provision of the air gap between the back of the sample and the housing. The fixing device of the point of application of the flame to the specimen 3 is in the form of a thin plate of non-combustible material (e.g., metal) with a cutout at the top. The fixing device of the point of application of the flame to the sample 3 is mounted on the clamping frame 7 and is movable in the vertical direction. As the gas burner 4 can be used with gas lighter. In the surface of the housing 1 And, if necessary, stabilization of convective flow, can be performed through a small square hole.

Small dimensions and small weight of the device allow its use at the venue works on fire protection.

The device operates as follows.

Before tested�I need to calibrate the device. The goal of calibration is to ensure optimal exposure to burner flame to the sample. When calibration is performed in the positioning of the burner 4 to install the upper part of the cone of the flame to the point "0". The flame should reach the neck of the fixing device of the point of application of the flame (0 point) 3 and touch the upper part of the sample. Calibration accuracy is ensured by the constancy of the angle of the fixation mechanism and the positioning of sample 2 relative to the housing 1 and the mobility of the fixing device of the point of application of the flame 3.

When tests were selected from the surface of the wood sample of a certain size is set to the fixing mechanism and the positioning of the sample 2. The sample is exposed to a certain time the burner flame 4. After turning off the burner 4 carry out a visual inspection of the sample and record certain parameters of the damage model.

During the test, the possibility of changing the point of contact of the burner flame (0 point) and the sample excluded. In a fixed position of the sample in the burner flame, there is no need for adjustment mechanisms of the device in the test process, ensuring the constancy of the heat transfer and eliminates touch heated parts of the device, which reduces traumatic.

The device is structurally ensures optimal pairs�meters of the impact of the flame on the specimen.

The proposed device allows you to experience not only fire resistant properties of the coatings and quality fire retardant treatment of wood, but also any other material such as fabric or paper.

Literature

Patent RU 2302625, publ. 10.07.2007 G., bull. No. 19.

Small-sized instrument for the rapid assessment of flame retardant properties of fire-retardant treatment of wood, consisting of a body made in the form of an open box section, mechanism for inserting and positioning of the sample, the mechanism of activation of a gas burner, the installation mechanism of the gas burner, characterized in that the tilt angle setting mechanism and positioning of the sample is made constant relative to the vertical axis of the housing and further comprises a fixation device of the point of application of the flame to the specimen with a cutout in the top of the device, and all components of the device installed in the body cavity.



 

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