A fire resistance testing device for a material and a method for using the same

Abstract

The present invention discloses a fire resistance performance detection device for a material and a method for using the same, and relates to the technical field of fire resistance detection devices, including a detection box; a cable positioning mechanism for fixing cables is provided on the detection box; a fire resistance detection mechanism is provided in the detection box; the fire resistance detection mechanism includes: a delivery pipe; a flame spray nozzle, which is installed in the annular part of the delivery pipe; and a detection position adjustment mechanism. The present invention sets a detection position adjustment mechanism, uses a driving mechanism to drive the flame spray nozzle to move along the delivery pipe, and accurately adjusts the position of the flame spray nozzle toward the circumference of the cable, thereby achieving adjustment of different fire resistance detection positions; by adjusting the flame spray nozzle during the fire resistance detection process, the burning state of the cable when the fire source position is affected by wind changes is simulated; various fire resistance states of the cable in actual use are simulated, and the accuracy and reliability of the fire resistance detection are improved, ensuring that the test results can truly reflect the fire resistance performance of the cable.

Description

Technical Field

[0001] The present invention relates to the technical field of fire resistance detection devices, and in particular to a fire resistance performance detection device for a material and a use method thereof. Background Art

[0002] In the material performance testing industry, ensuring the safety and durability of facilities is of vital importance; especially for cable protective covers, due to the particularity of their use environment, the fire resistance of the testing materials is particularly critical; therefore, special equipment is required to carry out this test to ensure that the cable equipment can work safely and reliably under various conditions.

[0003] In the prior art, the fire resistance testing device of the cable protective sleeve usually uses a fixed fire source to burn one side of the rubber protective sleeve; this testing method is intended to simulate the fire conditions that may be encountered in actual use, ensuring that the rubber protective sleeve can maintain its physical and chemical properties in a high temperature and flame environment, thereby protecting the internal conductor from damage.

[0004] However, the fire resistance performance testing device for the cable protective sleeve still has the following defects during use:

[0005] (1) When conducting cable fire resistance testing, due to the limitations of flame coverage, it is difficult to flexibly adjust the detection range of the fire source according to actual needs; this makes it difficult to fully evaluate the performance of the cable protective cover under real fire conditions, thus affecting the effect and accuracy of performance testing;

[0006] (2) During the fire resistance test of the cable protective cover, the burning part is easily blocked by the smoke generated by the combustion and the fire source itself. This not only prevents the direct observation of the fire resistance of the material with the naked eye, but also may interfere with the normal operation of the photosensitive sensor and affect the accuracy of the test results. Summary of the invention

[0007] In order to overcome the above technical problems, the purpose of the present invention is to provide a material fire resistance performance detection device and its use method, which is used to solve the problem that the existing cable refractory material detection equipment mentioned in the above background technology is difficult to flexibly adjust the fire source position, affecting the detection effect.

[0008] The purpose of the present invention can be achieved through the following technical solutions:

[0009] A fire resistance performance testing device for a material comprises a testing box; a cable positioning mechanism for fixing cables is arranged on the testing box; a fire resistance testing mechanism is arranged in the testing box; the fire resistance testing mechanism comprises:

[0010] A delivery pipe, the delivery pipe is installed in the detection box in a ring shape, and the cable is arranged through the ring portion of the delivery pipe;

[0011] A flame spray nozzle, wherein the flame spray nozzle is installed in the annular portion of the delivery pipe;

[0012] and a detection position adjustment mechanism, which is arranged in the detection box; the detection position adjustment mechanism includes a telescopic tube and a driving mechanism; the telescopic tube is slidably connected to the annular part of the delivery pipe, and the two together form a complete circular ring structure; the flamethrower is installed on the telescopic tube; the driving mechanism is installed in the detection box, and is used to drive the telescopic tube to move around the center of the annular part of the delivery pipe; the interior of the delivery pipe is always connected with the interior of the flamethrower through the telescopic tube.

[0013] Preferably, the driving mechanism comprises a steel wire rope, a pair of first cylinders and a first connecting block; the pair of first cylinders are installed in the detection box, and the output ends of the pair of first cylinders are respectively connected to the two ends of the steel wire rope through a pair of first connecting blocks; the steel wire rope is bent into a ring structure that matches the annular portion of the conveying pipe; and the flame nozzle is fixed to the steel wire rope;

[0014] A guide ring is provided on the annular portion of the conveying pipe; the annular structure of the wire rope is inserted into the guide ring; the guide ring is used to provide guidance for the movement of the wire rope, so that the wire rope always moves in an annular structure state that matches the annular portion of the conveying pipe.

[0015] Preferably, the driving mechanism further includes a mounting seat, a pair of telescopic sleeves and two groups of second connecting blocks; the telescopic tube is connected to the flamethrower through the mounting seat; a pair of telescopic sleeves are respectively sleeved on the telescopic tubes on both sides of the flamethrower; the two groups of second connecting blocks are respectively arranged on a pair of telescopic sleeves, and the wire rope passes through the second connecting block to be connected to the flamethrower.

[0016] Preferably, the cable positioning mechanism includes a pair of motors installed on both sides of the detection box and a winding wheel coaxially installed on the output end of the motor; the cable passes through the detection box and is wound around the two winding wheels; when the pair of motors are started synchronously, one of the winding wheels is driven to unwind and the other winding wheel is driven to rewind.

[0017] Preferably, a first distance adjustment mechanism is provided in the detection box, and the first distance adjustment mechanism includes a mounting frame and a second cylinder; the mounting frame is slidably connected to the detection box; the telescopic tube and the first cylinder are both mounted on the mounting frame; the input end of the telescopic tube is connected to the fuel tank through a hose; the second cylinder is mounted on the mounting frame, the output end of the second cylinder is connected to the detection box, and the second cylinder is used to drive the mounting frame to move.

[0018] Preferably, a tensioning mechanism is provided between the mounting frame and the detection box; the tensioning mechanism is used to adjust the tension of the cables in the detection box during detection.

[0019] Preferably, the tensioning mechanism includes a pressure sensor, a connecting rod and a rotating rod; the pressure sensor is installed on a mounting frame, the connecting rod is arranged on a detection box, and the rotating rod is hinged to the connecting rod; the connecting rod is an L-shaped structure, the short side end of the L-shaped structure contacts the pressure sensor, and the long side end of the L-shaped structure contacts the cable.

[0020] Preferably, the short side end of the connecting rod L-shaped structure is rotatably connected to a first pulley, and the first pulley contacts the pressure sensor; the long side end of the connecting rod L-shaped structure is rotatably connected to a second pulley, and the second pulley contacts the cable.

[0021] Preferably, the detection position adjustment mechanism further includes a second distance adjustment mechanism; the second distance adjustment mechanism is arranged at a position between the flame nozzle and the telescopic tube; the second distance adjustment mechanism includes a positioning bead, a groove is provided on the mounting seat, the groove is arranged in the groove, and the midpoint position of the steel wire rope is connected to the positioning bead; when both ends of the steel wire rope are simultaneously tightened, the mounting seat is driven to rotate around its axis through the positioning bead;

[0022] A torsion spring is arranged between the mounting seat and the telescopic tube; when the mounting seat loses its restriction, the torsion spring is used to drive the mounting seat to rotate and reset.

[0023] A method for using a material fire resistance testing device comprises the following steps:

[0024] Step 1: Fix the cable: Fix the cable through the cable positioning mechanism to keep the detection part of the cable taut in the detection box; at the same time, ensure that the cable passes through the center of the circular part of the conveying pipe;

[0025] Step 2: Position adjustment: The driving mechanism is used to control the flame nozzle to rotate with the center of the annular portion of the conveying pipe as the center point, thereby adjusting the position of the flame nozzle relative to the circumferential side of the cable;

[0026] Step 3: Fire resistance test: Fuel is introduced into the delivery pipe, and the fuel is sprayed out from the flame nozzle through the delivery pipe; the cable is subjected to a burning test through the ignition point formed at the flame nozzle.

[0027] Beneficial effects of the present invention:

[0028] By setting up a detection position adjustment mechanism, the driving mechanism is used to drive the flame nozzle to move along the conveying pipe, and the position of the flame nozzle toward the circumference of the cable is accurately adjusted, so as to achieve adjustment of different fire resistance detection positions; by adjusting the flame nozzle during the fire resistance detection process, the burning state of the cable when the fire source position is affected by wind changes is simulated; various fire resistance states of the cable in actual use are simulated, and at the same time, the accuracy and reliability of the fire resistance detection are improved, ensuring that the test results can truly reflect the fire resistance performance of the cable;

[0029] By setting a driving mechanism, the steel wire rope is driven to move along the circular path of the conveying pipe, so that the steel wire rope pulls the flame nozzle to move accurately, thereby adjusting the position of the flame nozzle and achieving the purpose of adjusting the detection point; this method can not only flexibly adjust the position of the flame nozzle, but also ensure the accuracy and stability of the detection point, thereby improving the overall detection effect;

[0030] By setting up a tensioning mechanism, the actual use status of the cable can be simulated, and the tensioning force of the cable can be accurately obtained through the pressure sensor. When the cable is deformed and loosened due to fire and the tensioning force decreases, the force on the pressure sensor is reduced, making it easy to know the cable status in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention will be further described below in conjunction with the accompanying drawings.

[0032] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0033] Figure 2 It is a schematic diagram of a partially cutaway three-dimensional structure of the detection box of the present invention;

[0034] Figure 3 It is a three-dimensional enlarged structural schematic diagram of the cable positioning mechanism and the fire resistance detection mechanism of the present invention;

[0035] Figure 4 It is a partially cutaway three-dimensional enlarged structural schematic diagram of the fire-resistant detection mechanism of the present invention;

[0036] Figure 5 It is a three-dimensional enlarged structural schematic diagram of the driving mechanism of the present invention;

[0037] Figure 6 It is a partially cutaway three-dimensional enlarged structural schematic diagram of the delivery pipe of the present invention;

[0038] Figure 7 The present invention Figure 6 A schematic diagram of the enlarged structure of the middle A area;

[0039] Figure 8 It is a schematic diagram of a partially exploded and enlarged structure of the driving mechanism of the present invention;

[0040] Fig. 9 It is a flow chart of the method of the present invention.

[0041] In the figure: 1. detection box; 2. cable positioning mechanism; 21. motor; 22. winding wheel; 3. fire-resistant detection mechanism; 31. conveying pipe; 32. flame nozzle; 33. detection position adjustment mechanism; 331. telescopic tube; 332. driving mechanism; 3321. first cylinder; 3322. first connecting block; 3323. wire rope; 3324. guide ring; 3325. mounting seat; 3326. telescopic sleeve; 3327. second connecting block; 34. first distance adjustment mechanism; 341. mounting frame; 342. second cylinder; 35. tensioning mechanism; 351. pressure sensor; 352. connecting rod; 353. rotating rod; 354. first pulley; 355. second pulley; 36. second distance adjustment mechanism; 361. positioning bead; 362. groove. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] like Figure 1-Figure 9 As shown, a fire resistance testing device for a material, such as Figure 1-3 As shown, it includes a detection box 1; a cable positioning mechanism 2 for fixing cables is arranged on the detection box 1; a fire-resistant detection mechanism 3 is arranged in the detection box 1; the fire-resistant detection mechanism 3 includes: a delivery pipe 31, which is installed in the detection box 1 in a ring shape, and the cable is arranged through the ring part of the delivery pipe 31; a flame nozzle 32, which is installed in the ring part of the delivery pipe 31; and a detection position adjustment mechanism 33, which is arranged in the detection box 1; the detection position adjustment mechanism 33 includes a telescopic tube 331 and a driving mechanism 332; the telescopic tube 331 is slidably connected to the ring part of the delivery pipe 31, and the two together constitute a complete circular ring structure; the flame nozzle 32 is installed on the telescopic tube 331; the driving mechanism 332 is installed in the detection box 1, and is used to drive the telescopic tube 331 to move around the center of the ring part of the delivery pipe 31; the interior of the delivery pipe 31 is always connected with the interior of the flame nozzle 32 through the telescopic tube 331.

[0044] It should be noted that the cable in the detection box 1 is stretched straight by the cable positioning mechanism 2 to simulate the taut state of the cable in actual use; then, the driving mechanism 332 is used to drive the flame nozzle 32 to move along the conveying pipe 31, and the orientation of the flame nozzle 32 relative to the circumferential position of the cable is accurately adjusted, thereby realizing the adjustment of different fire resistance detection positions; in this way, not only can various fire resistance states of the cable in actual use be simulated, but also the accuracy and reliability of the fire resistance detection can be significantly improved, ensuring that the test results can truly reflect the fire resistance performance of the cable; at the same time, the flame nozzle 32 can be adjusted during the fire resistance detection process to simulate the burning state of the cable when the fire source position is affected by wind changes.

[0045] like Figure 1-Figure 3 and Figure 5 As shown, the driving mechanism 332 includes a steel wire rope 3323, a pair of first cylinders 3321 and a first connecting block 3322; the pair of first cylinders 3321 are installed on the detection box 1, and the output ends of the pair of first cylinders 3321 are respectively connected to the two ends of the steel wire rope 3323 through a pair of first connecting blocks 3322; the steel wire rope 3323 is bent into an annular structure that is compatible with the annular portion of the delivery pipe 31; and the flame nozzle 32 is fixed to the steel wire rope 3323; a guide ring 3324 is provided on the annular portion of the delivery pipe 31; the annular structure portion of the steel wire rope 3323 is inserted into the guide ring 3324; the guide ring 3324 is used to provide guidance for the movement of the steel wire rope 3323, so that the steel wire rope 3323 always moves in an annular structure state that is compatible with the annular portion of the delivery pipe 31.

[0046] It should be noted that when the position of the flamethrower 32 needs to be adjusted, one of the first cylinders 3321 is driven to extend and the other first cylinder 3321 is driven to contract, and the first connecting block 3322 is used to drive the wire rope 3323 to move along the annular path of the conveying pipe 31; under the guidance of the telescopic tube 331, the wire rope 3323 pulls the flamethrower 32 for precise movement, thereby realizing the adjustment of the position of the flamethrower 32 and achieving the purpose of adjusting the detection point; this method can not only flexibly adjust the position of the flamethrower 32, but also ensure the accuracy and stability of the detection point, thereby improving the overall detection effect.

[0047] like Figure 5-Figure 6 and Figure 8 As shown, the driving mechanism 332 also includes a mounting seat 3325, a pair of telescopic sleeves 3326 and two groups of second connecting blocks 3327; the telescopic tube 331 is connected to the flamethrower 32 through the mounting seat 3325; the pair of telescopic sleeves 3326 are respectively sleeved on the telescopic tube 331 on both sides of the flamethrower 32; the two groups of second connecting blocks 3327 are respectively arranged on the pair of telescopic sleeves 3326, and the wire rope 3323 passes through the second connecting block 3327 to be connected to the flamethrower 32.

[0048] It should be noted that when the first cylinder 3321 drives the wire rope 3323 to move, in order to ensure that the pulling direction of the wire rope 3323 on the flame nozzle 32 is stable, a telescopic sleeve 3326 and a second connecting block 3327 are provided, so that when the wire rope 3323 pulls the flame nozzle 32, the telescopic sleeve 3326 is compressed, so that the multiple second connecting blocks 3327 are close to each other along the arc trajectory of the telescopic tube 331, so that the wire rope 3323 always maintains a circular state, that is, the pulling direction of the wire rope 3323 at the contact position with the flame nozzle 32 is always in a nearly vertical state with the moving direction of the flame nozzle 32, thereby ensuring the pulling effect on the flame nozzle 32.

[0049] like Figure 3-Figure 4 As shown, the detection box 1 (such as Figure 1 As shown in the figure, a first distance adjustment mechanism 34 is arranged in it, and the first distance adjustment mechanism 34 includes a mounting frame 341 and a second cylinder 342; the mounting frame 341 is slidably connected to the detection box 1; the telescopic tube 331 and the first cylinder 3321 are both installed on the mounting frame 341; the input end of the telescopic tube 331 is connected to the fuel tank through a hose; it can be understood that the hose and the fuel tank are both existing technologies and are not described in detail; the second cylinder 342 is installed on the mounting frame 341, the output end of the second cylinder 342 is connected to the detection box 1, and the second cylinder 342 is used to drive the mounting frame 341 to move.

[0050] It should be noted that in order to realize detection at different distances from the fire source, the second cylinder 342 drives the mounting frame 341 to move, thereby driving the flame nozzle 32 on the conveying pipe 31 to move, and adjusting the distance between the flame nozzle 32 and the cable to realize detection at different distances from the fire source, thereby improving the detection effect.

[0051] like Figure 3-Figure 4 As shown, the mounting frame 341 and the detection box 1 (such as Figure 1 a tensioning mechanism 35 is arranged between the two ends of the detection box 1 and the detection box 1; the tensioning mechanism 35 is used to adjust the tension of the cable during detection in the detection box 1; the tensioning mechanism 35 comprises a pressure sensor 351, a connecting rod 352 and a rotating rod 353; the pressure sensor 351 is installed on the mounting bracket 341; it can be understood that the pressure sensor 351 is a prior art and will not be described in detail; the connecting rod 352 is arranged on the detection box 1, and the rotating rod 353 is hinged to the connecting rod 352; the connecting rod 352 is an L-shaped structure, the short side end of the L-shaped structure is in conflict with the pressure sensor 351, and the long side end of the L-shaped structure is in conflict with the cable; the short side end of the L-shaped structure of the connecting rod 352 is rotatably connected to the first pulley 354, and the first pulley 354 is in conflict with the pressure sensor 351; the long end of the L-shaped structure of the connecting rod 352 is rotatably connected to the second pulley 355, and the second pulley 355 is in conflict with the cable.

[0052] It should be noted that in order to facilitate timely knowledge of the detection status, a tensioning mechanism 35 is provided to simulate the actual use status of the cable, and at the same time, the tensioning force of the cable is accurately known through the pressure sensor 351; the second cylinder 342 drives the mounting frame 341 to move, driving the pressure sensor 351 to move, so that the pressure sensor 351 pushes the rotating rod 353 to rotate, and then drives the second pulley 355 on the rotating rod 353 to contact the cable, so as to tighten the cable; at the same time, the cable tension is monitored in real time through the pressure sensor 351. When the cable is deformed and loosened due to the burning of the fire source and the tension decreases, the force on the pressure sensor 351 is reduced, so that the cable status can be timely known.

[0053] like Figure 5-Figure 8 As shown, the detection position adjustment mechanism 33 also includes a second distance adjustment mechanism 36; the second distance adjustment mechanism 36 is arranged at a position between the flamethrower 32 and the telescopic tube 331; the second distance adjustment mechanism 36 includes a positioning bead 361, a groove 362 is opened on the mounting seat 3325, the groove 362 is arranged in the groove 362, and the midpoint position of the wire rope 3323 is connected to the positioning bead 361; when both ends of the wire rope 3323 are simultaneously tightened, the mounting seat 3325 is driven to rotate around its axis through the positioning bead 361; a torsion spring is arranged between the mounting seat 3325 and the telescopic tube 331; when the mounting seat 3325 loses its restriction, the torsion spring is used to drive the mounting seat 3325 to rotate and reset.

[0054] It should be noted that in order to further adjust the position between the cable and the detected fire source, the first cylinder 3321 is driven to contract at the same time, the wire rope 3323 is pulled tight, and with the cooperation of the groove 362, the mounting seat 3325 is driven to rotate. At this time, the torsion spring is compressed, thereby driving the flamethrower 32 to rotate to adjust the cable fire resistance detection position; although the flamethrower 32 is not facing the cable at this time, since the fire source burns upward, the fire source will always burn facing the cable, thereby achieving the fire source position adjustment without affecting the cable fire resistance performance detection; and when the two first cylinders 3321 are extended synchronously, the flamethrower 32 can be driven to rotate and reset with the cooperation of the torsion spring.

[0055] like Figure 1-Figure 3 As shown, the cable positioning mechanism 2 includes a pair of motors 21 installed on both sides of the detection box 1 and a winding wheel 22 coaxially installed on the output end of the motor 21; the cable passes through the detection box 1 and is wound around the two winding wheels 22; when the pair of motors 21 are started synchronously, one of the winding wheels 22 is driven to unwind and the other winding wheel 22 is driven to rewind.

[0056] It should be noted that, by driving one of the winding wheels 22 to unwind and the other winding wheel 22 to reel in through the motor 21, the cable in the detection box 1 is driven to move and the cable fire resistance detection position is adjusted; by driving one winding wheel 22 to reel in and the other winding wheel 22 to remain stationary through the motor 21, the cable tension can be adjusted and the fire resistance detection efficiency can be improved.

[0057] like Figure 1-Figure 9 As shown, a method for using a material fire resistance performance detection device comprises the following steps:

[0058] Step 1: Fix the cable: fix the cable by the cable positioning mechanism 2 so that the detection part of the cable is kept taut in the detection box 1; at the same time, ensure that the cable passes through the center position of the annular part of the conveying tube 31;

[0059] Step 2: Position adjustment: The driving mechanism 332 is used to control the flame nozzle 32 to rotate with the center of the annular portion of the delivery tube 31 as the center point, thereby adjusting the position of the flame nozzle 32 relative to the circumferential side of the cable;

[0060] Step 3: Fire resistance test: by introducing fuel into the delivery pipe 31 , the fuel is sprayed out from the flame nozzle 32 through the delivery pipe 31 ; the cable is subjected to a burning test through the ignition point formed at the flame nozzle 32 .

[0061] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0062] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A device for testing the fire resistance of a material, comprising a testing box (1); characterized in that: The detection box (1) is provided with a cable positioning mechanism (2) for fixing the cable; the detection box (1) is provided with a fire resistance detection mechanism (3); the fire resistance detection mechanism (3) comprises: A delivery pipe (31), the delivery pipe (31) being installed in a ring shape in the detection box (1), and the cable passing through the ring portion of the delivery pipe (31); A flame spray nozzle (32), wherein the flame spray nozzle (32) is installed in an annular portion of the delivery pipe (31); and a detection position adjustment mechanism (33), the detection position adjustment mechanism (33) being arranged in the detection box (1); the detection position adjustment mechanism (33) being used to drive the flame spray nozzle (32) to rotate with the center of the annular portion of the delivery pipe (31) as a circle point; The detection position adjustment mechanism (33) comprises a telescopic tube (331) and a driving mechanism (332); the telescopic tube (331) is slidably connected to the annular portion of the delivery tube (31), and the two together form a complete annular structure; the flame spray nozzle (32) is mounted on the telescopic tube (331); the driving mechanism (332) is mounted on the detection box (1) and is used to drive the telescopic tube (331) to move around the center of the annular portion of the delivery tube (31); the interior of the delivery tube (31) is always connected to the interior of the flame spray nozzle (32) through the telescopic tube (331); The driving mechanism (332) comprises a steel wire rope (3323), a pair of first cylinders (3321) and a first connecting block (3322); the pair of first cylinders (3321) are installed on the detection box (1), and the output ends of the pair of first cylinders (3321) are respectively connected to the two ends of the steel wire rope (3323) through a pair of first connecting blocks (3322); the steel wire rope (3323) is bent into an annular structure that matches the annular portion of the conveying pipe (31); and the flame spray nozzle (32) is fixed to the steel wire rope (3323); A guide ring (3324) is provided on the annular portion of the conveying pipe (31); the annular structure portion of the steel wire rope (3323) is inserted into the guide ring (3324); the guide ring (3324) is used to provide guidance for the movement of the steel wire rope (3323), so that the steel wire rope (3323) always moves in an annular structure state that matches the annular portion of the conveying pipe (31); The driving mechanism (332) further comprises a mounting seat (3325), a pair of telescopic sleeves (3326) and two groups of second connecting blocks (3327); the telescopic tube (331) is connected to the flame-spraying nozzle (32) via the mounting seat (3325); the pair of telescopic sleeves (3326) are respectively sleeved on the telescopic tube (331) at both sides of the flame-spraying nozzle (32); the two groups of second connecting blocks (3327) are respectively arranged on the pair of telescopic sleeves (3326), and the steel wire rope (3323) passes through the second connecting blocks (3327) to be connected to the flame-spraying nozzle (32); The detection position adjustment mechanism (33) further comprises a second distance adjustment mechanism (36); the second distance adjustment mechanism (36) is arranged at a position between the flamethrower (32) and the telescopic tube (331); the second distance adjustment mechanism (36) comprises a positioning bead (361), a groove (362) is provided on the mounting seat (3325), the positioning bead (361) is arranged in the groove (362), and the midpoint of the steel wire rope (3323) is connected to the positioning bead (361); when both ends of the steel wire rope (3323) are simultaneously tightened, the mounting seat (3325) is driven to rotate around its axis through the positioning bead (361); A torsion spring is provided between the mounting seat (3325) and the telescopic tube (331); when the mounting seat (3325) loses its restriction, the torsion spring is used to drive the mounting seat (3325) to rotate and reset.

2. The fire resistance testing device for a material according to claim 1, characterized in that: The cable positioning mechanism (2) comprises a pair of motors (21) mounted on both sides of the detection box (1) and winding wheels (22) coaxially mounted on output ends of the motors (21); the cable passes through the detection box (1) and is wound around the two winding wheels (22); when the pair of motors (21) are started synchronously, one of the winding wheels (22) is driven to unwind and the other winding wheel (22) is driven to rewind.

3. The fire resistance testing device for a material according to claim 1, characterized in that: A first distance adjustment mechanism (34) is arranged in the detection box (1), and the first distance adjustment mechanism (34) comprises a mounting frame (341) and a second cylinder (342); the mounting frame (341) is slidably connected to the detection box (1); the telescopic tube (331) and the first cylinder (3321) are both mounted on the mounting frame (341); the input end of the telescopic tube (331) is connected to a fuel tank via a hose; the second cylinder (342) is mounted on the mounting frame (341), the output end of the second cylinder (342) is connected to the detection box (1), and the second cylinder (342) is used to drive the mounting frame (341) to move.

4. The fire resistance testing device for a material according to claim 3, characterized in that: A tensioning mechanism (35) is provided between the mounting frame (341) and the detection box (1); the tensioning mechanism (35) is used to adjust the tension of the cables in the detection box (1) during detection; The tensioning mechanism (35) comprises a pressure sensor (351), a connecting rod (352) and a rotating rod (353); the pressure sensor (351) is mounted on a mounting frame (341), the connecting rod (352) is arranged on a detection box (1), and the rotating rod (353) is hinged to the connecting rod (352); the connecting rod (352) is an L-shaped structure, the short side end of the L-shaped structure contacts the pressure sensor (351), and the long side end of the L-shaped structure contacts the cable.

5. The fire resistance testing device for a material according to claim 4, characterized in that: The short side end of the L-shaped structure of the connecting rod (352) is rotatably connected to a first pulley (354), and the first pulley (354) contacts the pressure sensor (351); the long side end of the L-shaped structure of the connecting rod (352) is rotatably connected to a second pulley (355), and the second pulley (355) contacts the cable.

6. A method for using a fire resistance testing device for a material according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Fixing the cable: fix the cable by means of the cable positioning mechanism (2) so that the detection part of the cable is kept in a taut state in the detection box (1); at the same time, ensure that the cable passes through the center position of the annular part of the conveying tube (31); Step 2: Position adjustment: controlling the flame spray nozzle (32) to rotate with the center of the annular portion of the delivery tube (31) as a circle point by means of the driving mechanism (332), thereby adjusting the position of the flame spray nozzle (32) relative to the circumferential side of the cable; Step 3: Fire resistance test: fuel is introduced into the delivery pipe (31), and the fuel is sprayed out from the flame nozzle (32) through the delivery pipe (31); The cable is subjected to a burning test by a fire point formed at the flame nozzle (32).

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