Cable material flame-retardant test device capable of continuously feeding samples

Abstract

A cable material flame-retardant test device capable of continuously feeding samples comprises an inner box body and an outer box body, and a sample frame, a gas inlet and an exhaust port are installed in the inner box body; the outer box body integrally covers the inner box body; the sample frame comprises two metal carrier rollers, a sample testing area is arranged between the two metal carrier rollers, and a flame nozzle of the fire source faces the sample testing area; a sample inlet and a sample outlet are formed in the left side wall and the right side wall of the inner box body; a sample placing roller and a sample collecting roller are respectively arranged outside the left side and the right side outside the inner box body; the tail end of a conveying mesh belt is fixed on a shaft of the sample placing roller, enters the inner box body from the sample inlet, sequentially passes through the two metal carrier rollers, leaves the inner box body from the sample outlet, and is fixed on a shaft of the sample collecting roller; needles are densely distributed on the surface of the conveying mesh belt. A rotating shaft of the sample collecting roller is connected to an output shaft of the motor; a flue gas concentration sensor is installed in the flue gas concentration detection channel on the exhaust port, a toxic gas sensor is installed in the exhaust port, and a thermocouple is installed in the inner box body.

Description

Technical Field

[0001] The utility model belongs to the technical field of cable material testing, in particular to a cable material flame retardant testing device capable of continuously feeding samples. Background Art

[0002] The flame retardancy of cable materials, such as insulation materials and sheath materials, is an extremely important safety testing performance. In the prior art, the flame retardancy test method for such materials is to first make the cable material into a sheet sample with the test standard size requirements, and then place the sample in the flame in the test chamber for flame retardancy testing. In the standard test method, only one piece of sample is fixed for a single test. In the actual use of cables, it is common for cables to move through fire areas, such as mobile cables used in mining pulling equipment. The flame retardancy test of such cable materials using existing test equipment or methods is difficult to reflect the actual situation of the fire scene. Summary of the Invention

[0003] In order to solve the above problems existing in the prior art, the utility model proposes a cable material flame retardant test device with continuous sample feeding, which includes an inner box and an outer box. The inner box is a fire-resistant box, and a sample rack, a fire source, a gas inlet, a sensor and an exhaust port are installed in the inner box.

[0004] The inner box is mounted on a bracket with its bottom suspended in the air; the outer box is entirely covered outside the inner box; a working space is left between the inner and outer boxes; a door is provided on the side of the outer box for people to enter and exit and can be opened and closed;

[0005] The top of the outer box body is provided with an air outlet, and the bottom of the outer box body is provided with an air inlet gap; the air outlet is connected to the air duct;

[0006] The sample rack includes two metal rollers with the same structure and height. The area between the two metal rollers is the sample testing area, and the flame nozzle of the fire source is facing the sample testing area. The left and right side walls of the inner box are provided with an inlet and an outlet for the sample to enter and exit. The inlet and outlet are of the same shape, both of which are rectangular.

[0007] A sample-laying roller and a sample-collecting roller are connected to the working spaces on the left and right sides of the inner box respectively; the end of a metal conveyor mesh belt is fixed to the shaft of the sample-laying roller, and the main body of the conveyor mesh belt is wound around the sample-laying roller. The end of the conveyor mesh belt enters the inner box from the sample inlet, passes through two metal rollers in sequence, leaves the inner box from the sample outlet, and is fixed to the shaft of the sample-collecting roller; belt-supporting rollers are connected between the sample-laying roller and the sample inlet, and between the sample outlet and the sample-collecting roller, and the height of the belt-supporting roller is consistent with that of the metal rollers; the surface of the conveyor mesh belt is densely covered with needle thorns, the height of which is lower than the thickness of the sample; the rotating shaft of the sample-collecting roller is connected to the output shaft of the motor;

[0008] The exhaust port is located at the top of the inner box and in the sample testing area; the exhaust port is connected to the smoke concentration detection channel; the smoke exhaust port of the smoke concentration detection channel is connected to the smoke pipe, which passes through the wall panel of the outer box, and the outer wall of the smoke pipe and the wall panel of the outer box are sealed;

[0009] Install a smoke concentration sensor in the smoke concentration detection channel, a toxic gas sensor in the exhaust port, and a thermocouple in the inner box;

[0010] The inner box body is provided with an openable door, which has a sealing structure; the gas inlet is located on the bottom surface of the inner box body below the sample testing area;

[0011] The air duct and the smoke duct are both connected to the exhaust gas treatment device.

[0012] This flame retardant test apparatus utilizes a continuous sample feeding mechanism. Besides simulating static combustion conditions, it can also simulate the movement of cables in a fire. The motor's adjustable speed also allows for adjustment of the duration the sample remains in flames. While the inlet and outlet dimensions can be tailored to fit the conveyor belt and sample closely, gaps will still exist. For safety reasons, a special outer enclosure has been designed (large enough to accommodate the continuous sample feeding mechanism and the routine work of test personnel). Any gas leakage from the inner enclosure is forcibly exhausted through the outer enclosure's exhaust vents (which accommodate an exhaust fan) and the air inlet gaps.

[0013] Furthermore, the wall panel material of the outer box body is transparent; and an observation window is connected to the side wall of the inner box body.

[0014] This structure facilitates observation of the test process.

[0015] Furthermore, the wall panel of the inner box body is a three-layer structure, which is a ceramic layer, an asbestos layer and a steel plate layer from the inside to the outside.

[0016] This structure ensures that the wall panels of the inner box are fire-resistant and flame-retardant.

[0017] Furthermore, the flame nozzle of the fire source is connected to the combustion gas source through a fuel pipeline; the gas source of combustible gas (such as propane gas) and the gas source of air are output through a mixed gas valve to obtain the combustion gas source; the mixing ratio of the gas source of combustible gas and the gas source of air is adjustable.

[0018] This structure ensures the gas required for the combustion of the fire source, while minimizing the impact of the gas required for the combustion of the fire source and the gas generated on the judgment of the flame retardant performance of the cable material. At the same time, the amount of gas required for the combustion of the fire source and the amount of gas generated can be calculated.

[0019] Furthermore, the nitrogen source, carbon dioxide source and oxygen source are respectively connected to the air inlet of the four-way pipe, and the air outlet of the four-way pipe is connected to the gas inlet; there are valves on the three air inlets of the four-way pipe; the nitrogen source, carbon dioxide source and oxygen source are all normal pressure gas sources (consistent with atmospheric pressure); the ratio of the three gases is adjustable.

[0020] This structure ensures that the proportion and volume of gases used in the flame retardant test of cable materials in the chamber are controllable. At the same time, in extreme emergency situations, oxygen can be turned off and nitrogen and carbon dioxide can be used to extinguish the fire in the chamber. Under normal pressure, the combustion-supporting and flame-retardant gases will not actively have an additional impact on the combustion / flame retardancy of the cable materials, which can make the combustion / flame retardancy of the cable materials as close as possible to the actual working conditions.

[0021] Furthermore, there are multiple flame nozzles, which are arranged in multiple rows above the sample testing area, with multiple flame nozzles in each row; and each flame nozzle is connected to the same combustion gas source.

[0022] This structure ensures that the sample is heated evenly, avoiding the adverse effects of uneven heating on the test results.

[0023] Furthermore, there are multiple thermocouples, each of which is divided into multiple groups, and each thermocouple in each group of thermocouples has the same distance from the sample test area.

[0024] This test chamber can be used to simulate flame retardant tests of cable materials under various fire conditions, filling a gap in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the test device of this embodiment (perspective)

[0026] Figure 2 This is a schematic diagram of the structure of the sample test area of ​​this embodiment ( Figure 1 Right perspective)

[0027] Figure 3 It is a structural diagram of the wall panel of the inner box;

[0028] Figure 4 This is a schematic diagram of the structure of the conveyor belt (top view);

[0029] Figure 5 It is a schematic diagram of the combustion gas source principle of the fire source;

[0030] Figure 6 This is a schematic diagram of the gas source principle of the gas inlet;

[0031] In the figure, inner box 1, outer box 2, gas inlet 3, exhaust port 4, bracket 5, exhaust port 6, air inlet gap 7, air duct 8, metal roller 9, sample testing area 10, flame nozzle 11, sample inlet 12, sample outlet 13, sample setting roller 14, sample collecting roller 15, conveyor mesh belt 16, belt supporting roller 17, acupuncture 18, flue gas concentration detection channel 19, smoke pipe 20, flue gas concentration sensor 21, toxic gas sensor 22, thermocouple 23, ceramic layer 24, asbestos layer 25, steel plate layer 26, mixed gas valve 27, four-way pipe 28, combustible gas source 29, air source 30, nitrogen source 31, carbon dioxide source 32, oxygen source 33. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific implementation methods.

[0033] Reference withdrawal Figure 1 A flame retardant test device for cable materials with continuous sample delivery comprises an inner box 1 and an outer box 2. The inner box is a fire-resistant box in which a sample holder, a fire source, a gas inlet 3, a sensor, and an exhaust port 4 are installed.

[0034] The inner box body is installed on the bracket 5 with the bottom suspended in the air; the outer box body 2 is entirely covered outside the inner box body 1; a working space is left between the inner and outer boxes; a door that can be opened and closed for people to enter and exit is opened on the side of the outer box body (using conventional technology, not marked in the figure).

[0035] The top of the outer box body 2 is provided with an air outlet 6, and the bottom of the outer box body is provided with an air inlet gap 7; the air outlet 6 is connected to the air duct 8;

[0036] The sample rack includes two metal rollers 9, which have the same structure and height. The area between the two metal rollers is the sample testing area 10, and the flame nozzle 11 of the fire source is facing the sample testing area. The left and right side walls of the inner box are provided with an inlet 12 and an outlet 13 for the sample to enter and exit. The inlet and outlet are of the same shape, both of which are rectangular.

[0037] In the working spaces outside the left and right sides of the inner box body, a sample-laying roller 14 and a sample-collecting roller 15 are connected respectively; the end of a metal conveyor mesh belt 16 is fixed to the shaft of the sample-laying roller 14, and the main body of the conveyor mesh belt is wound around the sample-laying roller. The end of the conveyor mesh belt enters the inner box body from the sample inlet 12, passes through two metal rollers 9 in sequence, leaves the inner box body from the sample outlet 13, and is fixed to the shaft of the sample-collecting roller 15; between the sample-laying roller and the sample inlet, and between the sample outlet and the sample-collecting roller, there are belt-supporting rollers 17, and the height of the belt-supporting rollers is consistent with that of the metal rollers; (For further reference, Figure 4The surface of the conveyor mesh belt 16 is densely covered with needle punctures 18, the height of which is lower than the thickness of the sample; the rotating shaft of the sample collection roller is connected to the output shaft of a motor (using conventional technology, not marked in the figure), and the motor drives the sample collection roller to rotate, thereby driving the conveyor mesh belt forward;

[0038] The exhaust port 4 is at the top of the inner box and above the sample testing area; the exhaust port is connected to the smoke concentration detection channel 19; the smoke exhaust port of the smoke concentration detection channel is connected to the smoke pipe 20, which passes through the wall of the outer box, and the outer wall of the smoke pipe and the wall of the outer box are sealed;

[0039] A smoke concentration sensor 21 is installed in the smoke concentration detection channel 19, a toxic gas sensor 22 is installed in the exhaust port 4, and a thermocouple 23 is installed in the inner box 1;

[0040] The inner box body is provided with a door that can be opened and closed (using conventional technology, not marked in the figure), and a sealing structure (such as a sealing ring) is provided on the door. The gas inlet 3 is located on the bottom surface of the inner box body below the sample testing area 10;

[0041] The air duct 8 and the smoke duct 20 are both connected to the waste gas treatment device (at the production site where dust, smoke, etc. are generated, environmental protection equipment such as waste gas treatment devices are built to centrally collect and treat dust, smoke, etc. Such equipment usually includes dust removal equipment, VOC gas absorption equipment, spraying equipment, etc.).

[0042] In this example:

[0043] The sensors include a smoke concentration sensor 21 , a toxic gas sensor 22 , and a thermocouple 23 .

[0044] The wall panel material of the outer box is transparent (the side wall can be constructed with glass as the main body); the side wall of the inner box is connected to an observation window, and during the test phase, personnel can observe the test conditions inside the inner box from outside the outer box.

[0045] refer to Figure 3 The wall panel of the inner box body is a three-layer structure, which is a ceramic layer 24, an asbestos layer 25 and a steel plate layer 26 from the inside to the outside.

[0046] refer to Figure 5 The flame nozzle of the fire source is connected to the combustion gas source through a fuel pipeline; the gas source 29 of the combustible gas (propane gas) and the gas source 30 of the air are output through the mixed gas valve 27 to obtain the combustion gas source, and the ratio of the two gases is adjustable.

[0047] refer to Figure 6The nitrogen source 31, the carbon dioxide source 32 and the oxygen source 33 are respectively connected to the air inlet of the four-way pipe 28, and the air outlet of the four-way pipe is connected to the gas inlet 3; there are valves on the three air inlets of the four-way pipe; the nitrogen source, the carbon dioxide source and the oxygen source are all normal pressure gas sources, and the ratio of the three gases is adjustable.

[0048] refer to Figure 2 There are multiple flame nozzles 11, which are arranged in a row above and / or below the sample test area 10; each flame nozzle is connected to the same combustion gas source. In this example, there are six rows, distributed above and below the sample test area.

[0049] There are multiple thermocouples, each of which is divided into multiple groups, and each thermocouple in each group of thermocouples has the same distance from the sample test area.

[0050] When using this device, a cable material is formed into a strip sample, the thickness of which meets established standards. The strip sample is then placed on a conveyor belt and secured by needles. The conveyor belt, also known as a mesh chain, is densely perforated with holes through which the flame from the flame nozzle can penetrate and impact the sample.

Claims

1. A flame retardant test device for cable materials with continuous sample delivery, characterized by The device comprises an inner box and an outer box, wherein the inner box is a fire-resistant box, and a sample rack, a fire source, a gas inlet, a sensor and an exhaust port are installed in the inner box; The inner box is mounted on a bracket with its bottom suspended in the air; the outer box is entirely covered on the inner box; a working space is left between the inner and outer boxes; a door is provided on the side of the outer box for people to enter and exit and can be opened and closed; The top of the outer box body is provided with an air outlet, and the bottom of the outer box body is provided with an air inlet gap; the air outlet is connected to the air duct; The sample rack includes two metal rollers with the same structure and height. The area between the two metal rollers is the sample testing area, and the flame nozzle of the fire source is facing the sample testing area. The left and right side walls of the inner box are provided with an inlet and an outlet for the sample to enter and exit. The inlet and outlet are of the same shape, both of which are rectangular. A sample-laying roller and a sample-collecting roller are connected to the working spaces on the left and right sides of the inner box respectively; the end of a metal conveyor mesh belt is fixed to the shaft of the sample-laying roller, and the main body of the conveyor mesh belt is wound around the sample-laying roller. The end of the conveyor mesh belt enters the inner box from the sample inlet, passes through two metal rollers in sequence, leaves the inner box from the sample outlet, and is fixed to the shaft of the sample-collecting roller; belt-supporting rollers are connected between the sample-laying roller and the sample inlet, and between the sample outlet and the sample-collecting roller, and the height of the belt-supporting roller is consistent with that of the metal rollers; the surface of the conveyor mesh belt is densely covered with needle thorns, the height of which is lower than the thickness of the sample; the rotating shaft of the sample-collecting roller is connected to the output shaft of the motor; The exhaust port is located at the top of the inner box and in the sample testing area; the exhaust port is connected to the smoke concentration detection channel; the smoke exhaust port of the smoke concentration detection channel is connected to the top of the smoke pipe, the smoke pipe passes through the wall panel of the outer box, and the outer wall of the smoke pipe and the wall panel of the outer box are sealed; Install a smoke concentration sensor in the smoke concentration detection channel, a toxic gas sensor in the exhaust port, and a thermocouple in the inner box; The inner box body is provided with an openable door, which has a sealing structure; the gas inlet is located on the bottom surface of the inner box body below the sample testing area; The air duct and the smoke duct are both connected to the exhaust gas treatment device.

2. The cable material flame retardant test device with continuous sample feeding according to claim 1 is characterized in that The wall panel material of the outer box body is transparent; the side wall of the inner box body is connected with an observation window.

3. The flame retardant testing device for cable materials with continuous sample feeding according to claim 1, characterized in that The wall panel of the inner box body is a three-layer structure, which comprises a ceramic layer, an asbestos layer and a steel plate layer from the inside to the outside.

4. The flame retardant testing device for cable materials with continuous sample feeding according to claim 1, characterized in that The flame nozzle of the fire source is connected to the combustion gas source through a fuel pipeline; the combustible gas source and the air source are output through a mixed gas valve to obtain the combustion gas source, and the ratio of the two gases is adjustable.

5. The cable material flame retardant test device with continuous sample feeding according to claim 1 is characterized in that The nitrogen source, carbon dioxide source and oxygen source are respectively connected to the air inlet of the four-way pipe, and the air outlet of the four-way pipe is connected to the gas inlet; there are valves on the three air inlets of the four-way pipe; the nitrogen source, carbon dioxide source and oxygen source are all atmospheric pressure gas sources, and the ratio of the three gases is adjustable.

6. The cable material flame retardant test device with continuous sample feeding according to claim 1, characterized in that There are multiple flame nozzles, which are arranged in multiple rows above and / or below the sample testing area, with multiple flame nozzles in each row; and each flame nozzle is connected to the same combustion gas source.

7. The cable material flame retardant test device with continuous sample feeding according to claim 1 is characterized in that There are multiple thermocouples, each of which is divided into multiple groups, and each thermocouple in each group of thermocouples has the same distance from the sample test area.

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