Fire resistance test device capable of accurately controlling hearth pressure

Abstract

The utility model discloses a fire-resistant test device capable of accurately controlling hearth pressure, which relates to the technical field of fire-resistant tests and comprises a fixed frame, the front side of the fixed frame is fixedly connected with a heat preservation frame, the inner wall of the heat preservation frame is fixedly connected with a heat preservation material, and the inner wall of the heat preservation material is fixedly connected with a mounting rack. The rear side of the fixing frame is fixedly connected with a first air inlet pipe and a second air inlet pipe, the fixing frame and the mounting frame are provided with front-back through holes, the inner walls of the holes are fixedly connected with nozzles, the rear ends of the nozzles are fixedly connected with a main flow pipe, and the upper side of the main flow pipe is fixedly connected with a mixing pipe; the device is provided with the scraping mechanism, so that after the device is used, deposited carbon and sundries in the partition cavity can be removed forwards through the shovel frame, the cleanness of the interior of the partition cavity is ensured, non-uniform flame distribution caused by foreign matters in the partition cavity is further reduced, and the device has the characteristics of high practicability and capability of reducing the adhesion amount of the foreign matters in the experimental device.

Description

Technical Field

[0001] The utility model relates to the technical field of fire resistance testing, in particular to a fire resistance testing device for accurately controlling furnace pressure. Background Art

[0002] With the continuous development of the construction industry and various new building materials, the importance of fire resistance of building components has become increasingly prominent. At present, the fire resistance test of building components is usually carried out in a fire test furnace. The fire test of building components must simulate the fire environment in the fire test furnace in accordance with the temperature and pressure requirements of the national standard GB / T 9978.1-2008 "Fire Test Method for Building Components", and the fire resistance of the test piece is determined by analyzing the integrity, thermal insulation and other indicators. Among them, combustion control technology occupies a very important position in the design of the fire test furnace, which determines the accuracy of the measurement and control of furnace temperature uniformity and furnace pressure uniformity during the test.

[0003] At present, most of the existing combustion control technologies for refractory test devices in China use pulse timing control technology and traditional continuous proportional combustion control technology. Usually, there are few burners in the test device and the burners are far apart. There is uneven heating temperature in the area within a certain range from the burner, which in turn affects the uneven distribution of furnace pressure. In addition, due to the sublimation of refractory materials and the carbon deposits formed after combustion, foreign matter will adhere to the inner wall of the refractory test device, causing uneven dispersion of flame heat, affecting the internal pressure distribution of the test device and thus affecting the distribution of flames;

[0004] Therefore, it is necessary to design a fire-resistant test device that is highly practical and can reduce the amount of foreign matter adhesion inside the experimental device and can accurately control the furnace pressure. Utility Model Content

[0005] The purpose of the utility model is to provide a fire resistance test device for accurately controlling furnace pressure, so as to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions: a fire resistance test device for accurately controlling furnace pressure, comprising a fixed frame, a heat preservation frame is fixedly connected to the front side of the fixed frame, a heat preservation material is fixedly connected to the inner wall of the heat preservation frame, a mounting frame is fixedly connected to the inner wall of the heat preservation material, a first air inlet pipe and a second air inlet pipe are fixedly connected to the rear side of the fixed frame respectively, an opening penetrating front and rear is opened on the fixed frame and the mounting frame, a nozzle is fixedly connected to the inner wall of the opening, a main flow pipe is fixedly connected to the rear end of the nozzle, a mixing pipe is fixedly connected to the upper side of the main flow pipe, the rear end of the main flow pipe is connected to the interior of the second air inlet pipe through an electromagnetic valve, and the rear end of the mixing pipe is connected to the interior of the first air inlet pipe through an electromagnetic valve, a partition cavity is arranged on the front side of the mounting frame, the front side of the nozzle extends to the interior of the partition cavity, a heat preservation mechanism is arranged on the upper side of the heat preservation frame, a mounting groove is opened on the lower side of the inner wall of the partition cavity on the mounting frame, an exhaust mechanism is arranged inside the partition cavity, and a scraping mechanism is arranged on the rear side of the mounting frame.

[0007] According to the above technical solution, the insulation mechanism includes a first motor, the outer wall of the first motor is fixedly connected to the upper side of the insulation frame, the output end of the first motor is connected to a winding rod through a gear transmission, the outer wall of the winding rod is rotatably connected to the upper side of the outer wall of the insulation frame through a bearing, the outer wall of the winding rod is fixedly connected to a pull rope, the upper part of the pull rope is wound around the outer wall of the winding rod, the other end of the pull rope is fixedly connected to an insulation door, the lower end of the insulation door is hinged to the inner wall of the insulation frame, and the outer wall of the insulation door is provided with a vibration mechanism.

[0008] According to the above technical scheme, the exhaust mechanism includes a collecting pipe, the upper end of the collecting pipe is fixedly connected with a hose, an exhaust pipe is arranged inside the mounting groove, both ends of the exhaust pipe pass through the mounting frame, the insulation material, and the insulation frame and extend to the outside of the insulation frame, one end of the exhaust pipe extends to the inside of the collecting pipe, the outer wall of the exhaust pipe is rotatably connected to the inner wall of the collecting pipe through a bearing, the interior of the exhaust pipe is connected to the interior of the collecting pipe, an air inlet is provided on the side wall of the exhaust pipe located inside the mounting groove, a baffle is also fixedly connected to the exhaust pipe, the outer wall of the baffle is in contact with the upper side of the inner wall of the mounting groove, a connecting pile is fixedly connected to the outer wall of one end of the exhaust pipe, an electric telescopic rod is hinged on the upper side of the outer wall of the connecting pile, and the upper end of the electric telescopic rod is hinged to the outer wall of the insulation frame.

[0009] According to the above technical solution, the outer wall of the exhaust pipe is rotatably connected to the inner wall of the mounting frame, the insulation material, and the insulation frame through bearings, and the upper surface of the baffle is in the same plane as the lower surface of the inner wall of the partition cavity, and the rear sides of the exhaust pipe and the baffle can be deflected inside the mounting groove.

[0010] According to the above technical scheme, the scraping mechanism includes a shovel frame, the outer wall of the shovel frame contacts the inner wall of the partition cavity, the rear side of the shovel frame is rotatably connected to a threaded rod through a bearing, a threaded hole running through the front and back is opened on the mounting frame, the rear end of the threaded rod extends to the rear side of the mounting frame through the threaded hole, the outer wall of the threaded rod is threadedly connected to the inner wall of the threaded hole, a gear sleeve is sleeved in the middle of the outer wall of the threaded rod, the outer wall of the gear sleeve is rotatably connected to the rear side of the outer wall of the mounting frame through a bearing, the rear side of the outer wall of the mounting frame is also rotatably connected to a roller ring through a bearing, the outer side of the gear sleeve and the roller ring is sleeved with a transmission belt, the rear side of the outer wall of the mounting frame is also fixedly connected to a second motor, the output end of the second motor is fixedly connected to a gear, and the outer wall of the gear is transmission-connected to the outer wall of the transmission belt.

[0011] According to the above technical solution, the outer wall of the threaded rod is a hexagonal column with a threaded structure, the inner wall of the gear sleeve is a hexagonal structure, and the threaded rod and the gear sleeve cannot rotate relative to each other.

[0012] According to the above technical scheme, the vibration mechanism includes a sub-plate, a hinge frame is provided on the side of the thermal insulation door close to the fixed frame, the sub-plate is arranged inside the hinge frame, the lower side of the sub-plate is hinged to the lower side of the inner wall of the hinge frame through a torsion spring, the side of the sub-plate close to the mounting frame is fixedly connected with a magnet plate, a slot is provided on the lower side of the inner wall of the mounting frame, a spoiler is inserted into the inner wall of the slot, the outer wall of the spoiler is slidably connected to the inner wall of the slot, a spring hole is provided on the front side of the mounting frame, a sliding magnet is slidably connected to the inner wall of the spring hole, one end of the sliding magnet close to the middle of the mounting frame is fixedly connected with a spring, one end of the spring is fixedly connected to the inner wall of the spring hole, and one side of the spring hole is connected to the inner lower side of the slot.

[0013] Compared with the prior art, the utility model has the following beneficial effects: the utility model is provided with a first air inlet pipe, a second air inlet pipe, a main flow pipe, a mixing pipe, a nozzle and other structures, so that the nozzle can perform flame spraying under the precise control of the solenoid valve, and then perform fire resistance test inside the partition cavity;

[0014] By providing a heat preservation mechanism, the device can simply shield the outside of the object under test during the fire resistance test, thereby preventing the external factors of the mounting frame from affecting the working environment inside the heat preservation frame, and quickly evacuate the heat preservation door after the test, so that the temperature inside the partition cavity is quickly reduced, thereby making it easier for the attached objects to be detached;

[0015] By providing an exhaust mechanism, the device can quickly extract the smoke inside the partition cavity when the object being tested is smoking or on fire, thereby reducing the pollution of the smoke to the inside of the partition cavity. The exhaust pipe rotates and the air inlet is drawn toward the front side, which can better drive the airflow outside the insulation frame to surge into the inside of the partition cavity without affecting the flame discharged from the nozzle. Under the dilution and extraction of smoke by the external airflow and the burning of smoke by the flame, the pollution of the partition cavity is reduced.

[0016] By providing a scraping mechanism, the device can scrape away carbon deposits and debris inside the partition cavity through the shovel frame after use, thereby ensuring the cleanliness of the partition cavity and reducing uneven flame distribution caused by foreign matter inside the partition cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0019] Figure 2 It is a schematic diagram of the rear structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the rear structure of the mounting frame of the utility model;

[0021] Figure 4 This is a schematic diagram of the scraping mechanism structure of the utility model;

[0022] Figure 5 It is a schematic diagram of the cross-sectional structure of the mounting frame of the utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the air extraction pipe of the utility model;

[0024] Figure 7 This utility model Figure 2 A is a schematic diagram of the enlarged structure of the middle part;

[0025] Figure 8 This is a schematic diagram of the structure of the sliding magnetic block of the utility model;

[0026] In the figure: 1, fixing frame; 2, heat preservation frame; 3, heat preservation material; 4, mounting frame; 5, first air inlet pipe; 6, second air inlet pipe; 7, main flow pipe; 8, mixing pipe; 9, nozzle; 10, heat preservation mechanism; 11, mounting groove; 12, air extraction mechanism; 13, scraping mechanism; 14, vibration mechanism; 101, first motor; 102, winding rod; 103, pull rope; 104, heat preservation door; 201, collecting pipe; 202, hose; 203, exhaust pipe; 204, air inlet; 205, baffle; 206, connecting pile; 207, electric telescopic rod; 301, shovel frame; 302, threaded rod; 303, gear sleeve; 304, roller ring; 305, transmission belt; 306, second motor; 307, gear; 401, sub-plate; 402, magnet plate; 403, spoiler; 404, sliding magnet; 405, spring. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1-8 The utility model provides a technical solution: a fire-resistant test device for accurately controlling furnace pressure, comprising a fixed frame 1, a heat preservation frame 2 is fixedly connected to the front side of the fixed frame 1, a heat preservation material 3 is fixedly connected to the inner wall of the heat preservation frame 2, a mounting frame 4 is fixedly connected to the inner wall of the heat preservation material 3, a first air inlet pipe 5 and a second air inlet pipe 6 are fixedly connected to the rear side of the fixed frame 1, respectively, front and rear through-holes are provided on the fixed frame 1 and the mounting frame 4, a nozzle 9 is fixedly connected to the inner wall of the hole, a main flow pipe 7 is fixedly connected to the rear end of the nozzle 9, and a main flow pipe 7 is fixedly connected to the rear end of the nozzle 9. A mixing pipe 8 is fixedly connected to the upper side of the flow pipe 7, the rear end of the main flow pipe 7 is connected to the interior of the second air inlet pipe 6 through a solenoid valve, the rear end of the mixing pipe 8 is connected to the interior of the first air inlet pipe 5 through a solenoid valve, a partition cavity is provided on the front side of the mounting frame 4, the front side of the nozzle 9 extends to the interior of the partition cavity, a heat preservation mechanism 10 is provided on the upper side of the heat preservation frame 2, a mounting groove 11 is provided on the lower side of the inner wall of the partition cavity on the mounting frame 4, an exhaust mechanism 12 is provided inside the partition cavity, and a scraping mechanism 13 is provided on the rear side of the mounting frame 4;

[0029] When in use, the test material is placed inside the partition cavity, and the gas is input through the external gas supply device connected to the second gas inlet pipe 6 and the first gas inlet pipe 5, so that the gas can be mixed through the main pipe 7 and the mixing pipe 8 and enter the nozzle 9, and then ignite through the front side of the nozzle 9, and the flame is ejected forward from the nozzle 9, so that the object under test is evenly discharged by the flame of the nozzle 9 to perform the fire resistance test;

[0030] The heat preservation mechanism 10 comprises a first motor 101, the outer wall of the first motor 101 is fixedly connected to the upper side of the heat preservation frame 2, the output end of the first motor 101 is connected to a winding rod 102 through a gear transmission, the outer wall of the winding rod 102 is rotatably connected to the upper side of the outer wall of the heat preservation frame 2 through a bearing, the outer wall of the winding rod 102 is fixedly connected to a pull rope 103, the upper part of the pull rope 103 is wound around the outer wall of the winding rod 102, the other end of the pull rope 103 is fixedly connected to a heat preservation door 104, the lower end of the heat preservation door 104 is hinged to the inner wall of the heat preservation frame 2, and the outer wall of the heat preservation door 104 is provided with a vibration mechanism 14;

[0031] When testing the object under test, the first motor 101 can be used to drive the winding rod 102 to rotate, so that the winding rod 102 can reel in the pull rope 103, so that the pull rope 103 pulls the insulation door 104 to move, so that the insulation door 104 stands vertically inside the insulation frame 2, so that the internal temperature of the insulation frame 2 and the mounting frame 4 is more concentrated, and the external environment is prevented from excessively affecting the flame distribution inside the mounting frame 4. After the test, the first motor 101 is started, so that the first motor 101 drives the winding rod 102 to rotate in the opposite direction, so that the winding rod 102 loosens the pull rope 103 and the insulation door 104, so that the insulation door 104 is quickly deflected downward, so that the high-temperature airflow inside the mounting frame 4 is quickly diffused outward, so that the foreign matter adhered to the inner wall of the partition cavity is deformed due to the pressure difference formed between the external rapid pre-cooling and the internal part, so that the adhered matter on the inner wall of the partition cavity is easier to detach, thereby reducing the amount of foreign matter adhered to the inner wall of the partition cavity;

[0032] The exhaust mechanism 12 includes a header 201, the upper end of which is fixedly connected to a hose 202, an exhaust pipe 203 is arranged inside the mounting groove 11, both ends of the exhaust pipe 203 penetrate the mounting frame 4, the insulation material 3, and the insulation frame 2 to extend to the outside of the insulation frame 2, one end of the exhaust pipe 203 extends to the inside of the header 201, the outer wall of the exhaust pipe 203 is rotatably connected to the inner wall of the header 201 through a bearing, the inside of the exhaust pipe 203 is connected to the inside of the header 201, the side wall of the exhaust pipe 203 is located inside the mounting groove 11 and is provided with an air inlet 204, and the exhaust pipe 203 is provided with an air inlet 204. 03 is also fixedly connected with a baffle 205, the outer wall of the baffle 205 contacts the upper side of the inner wall of the mounting groove 11, the outer wall of one end of the exhaust pipe 203 is fixedly connected with a connecting pile 206, the upper side of the outer wall of the connecting pile 206 is hinged with an electric telescopic rod 207, the upper end of the electric telescopic rod 207 is hinged with the outer wall of the insulation frame 2, the outer wall of the exhaust pipe 203 is rotatably connected with the mounting frame 4, the insulation material 3, and the inner wall of the insulation frame 2 through bearings, and the upper surface of the baffle 205 is in the same plane as the lower surface of the inner wall of the partition cavity, and the rear sides of the exhaust pipe 203 and the baffle 205 can be deflected inside the mounting groove 11;

[0033] When the object to be tested starts to smoke or in the later stage of the test, the electric telescopic rod 207 can be started to pull the connecting pile 206 upward, so that the connecting pile 206 drives the exhaust pipe 203 to deflect, and the exhaust pipe 203 drives the baffle 205 to deflect inside the installation groove 11, so that the rear side of the baffle 205 moves downward, and the front side of the baffle 205 tilts upward, and the exhaust device is connected to one end of the hose 202 for exhaust, so that the air flow enters the exhaust pipe 203 from the inside of the mounting frame 4 through the air inlet 204, and then is discharged through the manifold 201 and the hose 202, so that the smoke generated inside the mounting frame 4 can be quickly removed to reduce carbon deposition, and the inside of the mounting frame 4 can be quickly cooled down, thereby reducing the amount of foreign matter attached;

[0034] The scraping mechanism 13 includes a shovel frame 301, the outer wall of the shovel frame 301 contacts the inner wall of the partition cavity, the rear side of the shovel frame 301 is rotatably connected to a threaded rod 302 through a bearing, a threaded hole running through the front and rear is opened on the mounting frame 4, the rear end of the threaded rod 302 extends to the rear side of the mounting frame 4 through the threaded hole, the outer wall of the threaded rod 302 is threadedly connected to the inner wall of the threaded hole, a tooth sleeve 303 is sleeved in the middle of the outer wall of the threaded rod 302, the outer wall of the tooth sleeve 303 is rotatably connected to the rear side of the outer wall of the mounting frame 4 through a bearing, and the mounting frame The outer wall rear side of the mounting frame 4 is also rotatably connected with a roller ring 304 through a bearing, and the outer sleeves 303 and the roller ring 304 are sleeved with a transmission belt 305. The outer wall rear side of the mounting frame 4 is also fixedly connected with a second motor 306, and the output end of the second motor 306 is fixedly connected with a gear 307, and the outer wall of the gear 307 is transmission-connected with the outer wall of the transmission belt 305. The outer wall of the threaded rod 302 is a hexagonal prism with a threaded structure, and the inner wall of the gear sleeve 303 is a hexagonal structure. The threaded rod 302 and the gear sleeve 303 cannot rotate relative to each other.

[0035] After the experiment is over, the second motor 306 can be started to drive 607 to rotate, and then the gear 307 drives the transmission belt 305 to move, and the transmission belt 305 drives the gear sleeve 303 to rotate. Since the inner wall of the gear sleeve 303 contacts the outer wall of the threaded rod 302, the gear sleeve 303 drives the threaded rod 302 to rotate, and since the outer wall of the threaded rod 302 is threadedly connected to the inner wall of the mounting bracket 4, the threaded rod 302 moves forward during the rotation, so that the threaded rod 302 pushes the shovel frame 301 forward, so that the shovel frame 301 pushes the carbon deposits adhered to the inner wall of the partition cavity forward, which helps to clean the inside of the partition cavity and ensure the uniform distribution of flame and heat inside the partition cavity.

[0036] The vibration mechanism 14 includes a sub-plate 401, a hinged frame is provided on one side of the heat preservation door 104 close to the fixed frame 1, the sub-plate 401 is arranged inside the hinged frame, the lower side of the sub-plate 401 is hinged to the lower side of the inner wall of the hinged frame by a torsion spring, a magnet plate 402 is fixedly connected to one side of the sub-plate 401 close to the mounting frame 4, a slot is provided on the lower side of the inner wall of the mounting frame 4, a spoiler 403 is inserted into the inner wall of the slot, the outer wall of the spoiler 403 is slidably connected to the inner wall of the slot, a spring hole is provided on the front side of the mounting frame 4, a sliding magnetic block 404 is slidably connected to the inner wall of the spring hole, a spring 405 is fixedly connected to one end of the sliding magnetic block 404 close to the middle of the mounting frame 4, one end of the spring 405 is fixedly connected to the inner wall of the spring hole, and one side of the spring hole is connected to the lower inner side of the slot;

[0037] When the thermal insulation door 104 is in a fitted state with the mounting frame 4 for a combustion test, the outer wall of the sub-plate 401 is fitted with the mounting frame 4, so that the sub-plate 401 and the magnet plate 402 squeeze the sliding magnetic block 404, causing the spring 405 to undergo elastic deformation, and at the same time, the gas inside the spring groove is discharged into the slot, so that the spoiler plate 403 is pushed up by the gas, and then the nozzle 9 sprays the flame forward, while the lower airflow is blocked by the spoiler plate 403 and moves upward, so that the subsequent airflow forms turbulence, increasing the combustion efficiency and reducing the carbide formed by incomplete combustion. At the same time, when the thermal insulation door 104 is away from the mounting frame 4, since the magnet plate 402 is in contact with the sliding magnetic block 404 at this time, The two are attracted to each other, and at this time, the sliding magnetic block 404 is pulled to move to the outside of the spring groove, so that the spring 405 is deformed and stores energy, and the spoiler 403 descends. At the same time, the auxiliary plate 401 is deflected relative to the thermal insulation door 104 due to the attraction of the magnet plate 402 and the sliding magnetic block 404. When the auxiliary plate 401 reaches the deflection limit, the thermal insulation door 104 continues to deflect and move downward, and the magnet plate 402 and the sliding magnetic block 404 are instantly separated. The sliding magnetic block 404 moves to the inside of the spring groove due to the elastic force of the spring 405 and hits the mounting frame 4, causing the mounting frame 4 to vibrate, so that the lower surface of the internal test object and the inner wall of the mounting frame 4 are vibrated under high temperature to produce a slight displacement, so as to avoid the adhesion of the two after cooling and inconvenience in removal;

[0038] And because the torsion spring at the connection between the sub-plate 401 and the thermal insulation door 104 drives the sub-plate 401 to reset instantly after the magnet plate 402 and the sliding magnet block 404 are instantly separated, the gas between the sub-plate 401 and the thermal insulation door 104 is instantly discharged, thereby causing an airflow to diffuse from the front side of the mounting frame 4 to the surroundings. Due to the fast diffusion speed of the airflow, a low-pressure area is formed on the front side of the mounting frame 4, thereby reducing the possibility of smoke from incomplete combustion inside the partition cavity forming an explosion at the moment of opening the door.

[0039] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A fire resistance test device for accurately controlling furnace pressure, comprising a fixing frame (1), characterized in that: The front side of the fixed frame (1) is fixedly connected to a heat preservation frame (2), the inner wall of the heat preservation frame (2) is fixedly connected to a heat preservation material (3), the inner wall of the heat preservation material (3) is fixedly connected to a mounting frame (4), the rear side of the fixed frame (1) is respectively fixedly connected to a first air intake pipe (5) and a second air intake pipe (6), the fixed frame (1) and the mounting frame (4) are provided with openings that penetrate the front and rear, the inner wall of the opening is fixedly connected to a nozzle (9), the rear end of the nozzle (9) is fixedly connected to a main flow pipe (7), and the upper side of the main flow pipe (7) is fixedly connected to a mixing pipe (8), The rear end of the main flow pipe (7) is connected to the interior of the second air intake pipe (6) through a solenoid valve, and the rear end of the mixing pipe (8) is connected to the interior of the first air intake pipe (5) through a solenoid valve. A partition cavity is provided on the front side of the mounting frame (4), and the front side of the nozzle (9) extends to the interior of the partition cavity. A thermal insulation mechanism (10) is provided on the upper side of the thermal insulation frame (2). A mounting groove (11) is provided on the lower side of the inner wall of the partition cavity on the mounting frame (4), and an exhaust mechanism (12) is provided inside the partition cavity. A scraping mechanism (13) is provided on the rear side of the mounting frame (4).

2. A fire resistance test device for accurately controlling furnace pressure according to claim 1, characterized in that: The heat preservation mechanism (10) comprises a first motor (101), the outer wall of the first motor (101) is fixedly connected to the upper side of the heat preservation frame (2), the output end of the first motor (101) is connected to a winding rod (102) through a gear transmission, the outer wall of the winding rod (102) is rotatably connected to the upper side of the outer wall of the heat preservation frame (2) through a bearing, the outer wall of the winding rod (102) is fixedly connected to a pull rope (103), the upper part of the pull rope (103) is wound around the outer wall of the winding rod (102), the other end of the pull rope (103) is fixedly connected to a heat preservation door (104), the lower end of the heat preservation door (104) is hinged to the inner wall of the heat preservation frame (2), and the outer wall of the heat preservation door (104) is provided with a vibration mechanism (14).

3. A fire resistance test device for accurately controlling furnace pressure according to claim 2, characterized in that: The air extraction mechanism (12) comprises a collecting pipe (201), the upper end of which is fixedly connected to a hose (202), an air extraction pipe (203) is arranged inside the mounting groove (11), both ends of the air extraction pipe (203) penetrate the mounting frame (4), the thermal insulation material (3), and the thermal insulation frame (2) and extend to the outside of the thermal insulation frame (2), one end of the air extraction pipe (203) extends to the inside of the collecting pipe (201), the outer wall of the air extraction pipe (203) is rotatably connected to the inner wall of the collecting pipe (201) via a bearing, and the air extraction pipe (203) is rotatably connected to the inner wall of the collecting pipe (201) via a bearing. The interior is connected to the interior of the collecting pipe (201); an air inlet (204) is provided on the side wall of the air extraction pipe (203) located inside the mounting groove (11); a baffle (205) is fixedly connected to the air extraction pipe (203); the outer wall of the baffle (205) contacts the upper side of the inner wall of the mounting groove (11); a connecting pile (206) is fixedly connected to the outer wall of one end of the air extraction pipe (203); an electric telescopic rod (207) is hingedly connected to the upper side of the outer wall of the connecting pile (206); and the upper end of the electric telescopic rod (207) is hingedly connected to the outer wall of the insulation frame (2).

4. A fire resistance test device for accurately controlling furnace pressure according to claim 3, characterized in that: The outer wall of the exhaust pipe (203) is rotatably connected to the inner wall of the mounting frame (4), the thermal insulation material (3), and the thermal insulation frame (2) via bearings, and the upper surface of the baffle plate (205) and the lower surface of the inner wall of the partition cavity are in the same plane, and the rear sides of the exhaust pipe (203) and the baffle plate (205) can be deflected inside the mounting groove (11).

5. A fire resistance test device for accurately controlling furnace pressure according to claim 4, characterized in that: The scraping mechanism (13) comprises a shovel frame (301), the outer wall of the shovel frame (301) contacts the inner wall of the partition cavity, the rear side of the shovel frame (301) is rotatably connected to a threaded rod (302) via a bearing, the mounting frame (4) is provided with a threaded hole extending through the front and rear, the rear end of the threaded rod (302) extends to the rear side of the mounting frame (4) through the threaded hole, the outer wall of the threaded rod (302) is threadedly connected to the inner wall of the threaded hole, and a tooth sleeve (303) is sleeved on the middle part of the outer wall of the threaded rod (302), the tooth sleeve (303) The outer wall of the sleeve (303) is rotatably connected to the rear side of the outer wall of the mounting frame (4) via a bearing, and the rear side of the outer wall of the mounting frame (4) is also rotatably connected to a roller ring (304) via a bearing. The outer sleeves of the gear sleeve (303) and the roller ring (304) are provided with a transmission belt (305). The rear side of the outer wall of the mounting frame (4) is also fixedly connected to a second motor (306), and the output end of the second motor (306) is fixedly connected to a gear (307), and the outer wall of the gear (307) is transmission-connected to the outer wall of the transmission belt (305).

6. A fire resistance test device for accurately controlling furnace pressure according to claim 5, characterized in that: The outer wall of the threaded rod (302) is a hexagonal column with a threaded structure, and the inner wall of the toothed sleeve (303) is a hexagonal structure. The threaded rod (302) and the toothed sleeve (303) cannot rotate relative to each other.

7. A fire resistance test device for accurately controlling furnace pressure according to claim 6, characterized in that: The vibration mechanism (14) comprises a sub-plate (401), a hinge frame is provided on a side of the heat-insulating door (104) close to the fixed frame (1), the sub-plate (401) is arranged inside the hinge frame, the lower side of the sub-plate (401) is hinged to the lower side of the inner wall of the hinge frame via a torsion spring, the side of the sub-plate (401) close to the mounting frame (4) is fixedly connected to a magnet plate (402), the lower side of the inner wall of the mounting frame (4) is provided with a slot, and the inner wall of the slot is inserted into A spoiler (403) is provided, the outer wall of the spoiler (403) is slidably connected to the inner wall of the slot, a spring hole is provided on the front side of the mounting frame (4), a sliding magnetic block (404) is slidably connected to the inner wall of the spring hole, one end of the sliding magnetic block (404) close to the middle of the mounting frame (4) is fixedly connected to a spring (405), one end of the spring (405) is fixedly connected to the inner wall of the spring hole, and one side of the spring hole is connected to the inner lower side of the slot.

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