Fire-retardant coating heat insulation efficiency test furnace

Abstract

The application discloses a fireproof coating heat insulation efficiency test furnace and relates to the technical field of fireproof coating heat insulation experiments. The fireproof coating heat insulation efficiency test furnace comprises a base, a test furnace body is arranged on the upper surface of the base, a furnace cover is arranged at the top of the test furnace body, pull frames are fixedly arranged on the two sides of the upper surface of the furnace cover, a smoke exhaust control assembly is arranged at the smoke exhaust position of the furnace cover, the smoke exhaust control assembly can adjust the smoke exhaust amount in real time through the pressure change of the test furnace body, the smoke exhaust control assembly can sense the pressure change in the test furnace body in real time by using the sensing sheet, and the sensing sheet can drive the meshing transmission of the rack one and the gear one, so that the opening size of the flap valve can be automatically adjusted. When the positive pressure in the furnace is too large, the opening size of the flap valve is increased to strengthen the smoke exhaust, the hot flue gas is prevented from rushing out of the test piece gap to directly scorch the backfire surface thermocouple, and the heat insulation time is prevented from being too low. When the negative pressure appears in the furnace, the opening size of the flap valve is reduced to maintain the positive pressure.

Description

Technical Field

[0001] This invention relates to the field of fire-retardant coating heat insulation testing technology, specifically a fire-retardant coating heat insulation efficiency testing furnace. Background Technology

[0002] Fire-retardant coatings are special coatings applied to the surface of substrates (such as steel structures). Their core function is to delay the temperature rise of the substrate during a fire, thus buying time for personnel evacuation and fire rescue. The fire-retardant coating heat insulation efficiency test is a key test to evaluate its fire resistance performance according to national standards. The test uses a special horizontal combustion test furnace, in which the specimen (such as a steel plate) coated with fire-retardant coating is horizontally installed at the furnace opening, with the coated surface facing downwards.

[0003] In existing fire-retardant coating insulation efficiency testing furnaces, the fire-retardant coating-coated specimens are first installed and fixed at the furnace opening. Then, the combustion system is started to heat the furnace chamber. Based on a standard temperature rise curve, the fuel supply and air ratio are precisely adjusted through thermocouples and the control system to ensure that the furnace temperature rises according to a predetermined time and temperature function. During the heating process, the high-temperature flue gas generated in the furnace chamber must be continuously discharged through the exhaust port at the top and the connected exhaust pipe to maintain a stable positive pressure state inside the furnace. This prevents the hot flue gas from leaking out and affecting the accuracy of the temperature measurement on the unexposed side, while also avoiding excessive pressure inside the furnace that could damage the furnace's sealing structure.

[0004] However, during operation, pressure fluctuations inside the furnace cause hot gas to leak out, affecting the back-fire temperature. If the positive pressure is too high, hot flue gas will rush out from the gaps in the specimen and directly heat the thermocouple on the back-fire surface, resulting in a falsely low insulation time. If the negative pressure is too high, cold air will be drawn into the furnace, resulting in a falsely high insulation time, which will have a certain impact on the test results.

[0005] Although this problem can be solved by changing the size of the smoke outlet, the hottest flue gas floats in the upper part of the furnace and the cooler flue gas is in the lower part. This stable stratification will prevent heat from reaching the lower specimens. The upper part will be subjected to extreme high temperature too early and fail faster, while the lower part will not be able to fully test its heat insulation performance due to insufficient heat. Therefore, the test results cannot truly reflect the overall heat insulation efficiency of the fireproof coating under uniform fire conditions. Summary of the Invention

[0006] The purpose of this invention is to provide a fireproof coating heat insulation efficiency test furnace to solve the problem of avoiding the impact of pressure fluctuations on the overall test and to effectively regulate the internal heat stratification.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a fire-retardant coating heat insulation efficiency test furnace, comprising a base, a test furnace body mounted on the upper surface of the base, a furnace cover mounted inside the top of the test furnace body, lifting brackets fixedly mounted on both sides of the upper surface of the furnace cover, a smoke exhaust control component mounted at the smoke exhaust port of the furnace cover, the smoke exhaust control component adjusting the smoke output in real time according to the pressure change of the test furnace body, a synchronous adjustment component converting the meshing force into an adjustment force mounted on the power output end of the smoke exhaust control component, and the synchronous adjustment component synchronously adjusting the heat stratification inside the test furnace body through a connecting piece.

[0008] Preferably, the smoke exhaust control assembly includes a smoke exhaust pipe, a flap valve, a connecting pipe, a sensing element, a control rod, a gear, and a rack. One end of the outer surface of the smoke exhaust pipe is fixedly installed to the top of the interior of the test furnace body. The inlet of the flap valve is fixedly installed to the other end of the smoke exhaust pipe. One side of the outer surface of the connecting pipe is connected to the interior of the smoke exhaust pipe. The sensing element is fixedly installed to the inner wall of the connecting pipe on all four sides. The outer surface of the control rod is controlled by the interior of the flap valve. The interior of the gear is fixedly installed to the outer surface of the control rod. The right side of the rack meshes with the outer surface of the gear.

[0009] Preferably, the synchronous adjustment assembly includes a rotating shaft, a gear, a rack, a connecting frame, a rack, a limiting block, and a top adjustment plate. The outer surface of the rotating shaft is rotatably mounted to the inner wall of the base. The inside of the gear is fixedly mounted to the outer surface of one end of the rotating shaft. The lower surface of the rack meshes with the outer surface of the gear. The bottom of the connecting frame is fixedly mounted to the upper surface of the rack. The left side of the rack is fixedly mounted to the right side of the connecting frame. The inner wall of the limiting block is slidably connected to the outer surface of the rack. One side of the top adjustment plate is fixedly mounted to the outer surface of the rotating shaft, and the top adjustment plate is located on the upper inner side of the test furnace body.

[0010] Preferably, a receiving frame is fixedly installed on the back of the sensing sheet, and the right side of the receiving frame is fixedly installed on the left side of the rack.

[0011] Preferably, the flue valve is equipped with a second smoke exhaust pipe at its smoke outlet end.

[0012] Preferably, the bottom of the limiting block is fixedly installed on the upper surface of the gear, and a pulley is fixedly installed on the outer surface of one end of the rotating shaft.

[0013] Preferably, a drive belt is driven on the outer surface of the first pulley, and a second pulley is driven on the inner ring of the drive belt.

[0014] Preferably, a connecting shaft is fixedly installed inside the second pulley, the outer surface of the connecting shaft is rotatably installed with the inner wall of the test furnace body, and a bottom adjusting plate is fixedly installed on the outer surface of the connecting shaft.

[0015] Preferably, a rectangular block is fixedly installed on the upper surface of the base, an external gas pipe is installed inside the rectangular block, and a placement platform is installed inside the test furnace body.

[0016] Preferably, an extension gas pipe 1 is installed inside the external gas pipe, an extension gas pipe 2 is installed inside the extension gas pipe 1, and multiple sets of burners are installed inside the extension gas pipe 2. The burners are located inside the test furnace body.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a smoke exhaust control component to sense pressure changes inside the test furnace in real time using a sensing element. This sensor drives a rack and pinion to mesh with a gear, automatically adjusting the opening of the flap valve. When the positive pressure inside the furnace is too high, the flap valve opening increases to enhance smoke exhaust, preventing hot smoke from escaping through the gaps in the specimen and directly scorching the thermocouple on the unexposed surface, thus avoiding falsely low insulation time. When negative pressure occurs inside the furnace, the flap valve opening decreases to maintain positive pressure, preventing cold air from being drawn into the furnace and causing abnormal cooling of the unexposed surface, thus avoiding falsely high insulation time. This improves the accuracy of the unexposed temperature measurement and the repeatability of the test results.

[0018] This invention converts the meshing force output by the smoke exhaust control component into a linkage adjustment force by setting up a synchronous adjustment component: when the flap valve is activated due to pressure changes, rack three, the connecting frame, and rack two are sequentially driven to rotate gear two and rotating shaft one, thereby causing the top and bottom adjustment plates to deflect synchronously. When the smoke exhaust volume increases, the top adjustment plate tilts downward to guide the high-temperature smoke from the upper part to the lower part, and the bottom adjustment plate tilts upward to promote the mixing of hot and cold smoke, effectively breaking the stable stratification of hot smoke; when the smoke exhaust volume decreases, the adjustment plates reset to maintain a reasonable smoke flow state, ensuring that vertically installed or high-height specimens are heated evenly in the height direction, avoiding premature failure of the upper part and insufficient testing of the lower part, so that the measured heat insulation efficiency truly reflects the overall heat insulation performance of the fireproof coating under uniform fire conditions. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 A top-view structural diagram; Figure 3 For the present invention Figure 1 A schematic diagram of the side view structure; Figure 4 For the present invention Figure 1 Internal structure diagram; Figure 5 For the present invention Figure 4 A schematic diagram of the rear view structure; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A; Figure 7 For the present invention Figure 4 A top-view structural diagram; Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point B.

[0020] In the diagram: 1. Base; 2. Test furnace body; 3. Furnace cover; 4. Lifting frame; 5. Rectangular block; 6. External gas pipe; 7. Extension gas pipe one; 8. Extension gas pipe two; 9. Burner head; 10. Smoke exhaust control assembly; 101. Smoke exhaust pipe one; 102. Flip valve; 103. Smoke exhaust pipe two; 104. Connecting pipe; 105. Sensing plate; 106. Control rod; 107. Gear one; 108. Support frame; 109. Rack one; 11. Synchronous adjustment assembly; 111. Rotating shaft one; 112. Gear two; 113. Rack two; 114. Connecting frame; 115. Rack three; 116. Limiting block; 117. Pulley one; 118. Transmission belt; 119. Pulley two; 1110. Connecting shaft two; 1111. Bottom adjusting plate; 1112. Top adjusting plate; 12. Placement platform. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1 , Figure 5 and Figure 6As shown, the present invention provides a technical solution: a fireproof coating heat insulation efficiency test furnace, including a base 1, a test furnace body 2 installed on the upper surface of the base 1, a furnace cover 3 installed inside the top of the test furnace body 2, lifting brackets 4 fixedly installed on both sides of the upper surface of the furnace cover 3, a smoke exhaust control component 10 installed at the smoke exhaust port of the furnace cover 3, the smoke exhaust control component 10 adjusting the smoke output in real time according to the pressure change of the test furnace body 2, a synchronous adjustment component 11 converting the meshing force into an adjustment force installed at the power output end of the smoke exhaust control component 10, the synchronous adjustment component 11 synchronously adjusting the heat stratification inside the test furnace body 2 through a connecting part, and the smoke exhaust control component 10 including a smoke exhaust pipe 101, a flap valve 102, a connecting pipe 104, a sensing plate 105, and a control rod 106. Gear 107 and rack 109 are provided. One end of the outer surface of the exhaust pipe 101 is fixedly installed to the top of the interior of the test furnace body 2. The inlet of the flap valve 102 is fixedly installed to the other end of the exhaust pipe 101. One side of the outer surface of the connecting pipe 104 is connected to the interior of the exhaust pipe 101. The sensing plate 105 is fixedly installed to the inner wall of the connecting pipe 104 on all four sides. The outer surface of the control rod 106 is controlled and installed inside the flap valve 102. The interior of gear 107 is fixedly installed to the outer surface of the control rod 106. The right side of the rack 109 meshes with the outer surface of gear 107. A receiving frame 108 is fixedly installed on the back of the sensing plate 105. The right side of the receiving frame 108 is fixedly installed to the left side of the rack 109. An exhaust pipe 103 is provided at the exhaust end of the flap valve 102.

[0023] Specifically, the smoke exhaust control component 10 adjusts the smoke output in real time based on the pressure changes in the test furnace body 2. The pressure changes continuously with combustion and other conditions. This smoke exhaust control component 10 can adjust the smoke output promptly according to pressure changes, ensuring that the pressure inside the test furnace remains relatively stable and suitable. This facilitates accurate simulation of the heat insulation environment of fire-retardant coatings under actual fire scenarios, improving the accuracy and reliability of the test results. In the smoke exhaust control component 10, the sensing element 105 can detect changes in pressure inside the test furnace in a timely manner. Through the support frame 108, it drives the rack 109 to move. The rack 109 meshes with the gear 107, which in turn drives the control rod 106 to rotate, thereby adjusting the opening of the flap valve 102. This structure makes the adjustment of the smoke output response rapid, and can quickly adapt to changes in pressure inside the test furnace, ensuring the stable conduct of the test.

[0024] according to Figure 1 , Figure 7 and Figure 8As shown, the synchronous adjustment assembly 11 includes a rotating shaft 111, a gear 112, a rack 113, a connecting frame 114, a rack 115, a limiting block 116, and a top adjusting plate 1112. The outer surface of the rotating shaft 111 is rotatably mounted to the inner wall of the base 1. The interior of the gear 112 is fixedly mounted to the outer surface of one end of the rotating shaft 111. The lower surface of the rack 113 meshes with the outer surface of the gear 112. The bottom of the connecting frame 114 is fixedly mounted to the upper surface of the rack 113. The left side of the rack 115 is fixedly mounted to the right side of the connecting frame 114. The inner wall of the limiting block 116 is slidably connected to the outer surface of the rack 115. The top adjusting plate 1112... One side of 12 is fixedly installed on the outer surface of the rotating shaft 111, and the top adjusting plate 1112 is set on the upper side of the inside of the test furnace body 2. The bottom of the limiting block 116 is fixedly installed on the upper surface of the gear 107. A pulley 117 is fixedly installed on the outer surface of one end of the rotating shaft 111. A transmission belt 118 is driven on the outer surface of the pulley 117. A pulley 119 is driven on the inner ring of the transmission belt 118. A connecting shaft 1110 is fixedly installed inside the pulley 119. The outer surface of the connecting shaft 1110 is rotatably installed on the inner wall of the test furnace body 2. A bottom adjusting plate 1111 is fixedly installed on the outer surface of the connecting shaft 1110.

[0025] Specifically, the synchronous adjustment component 11 drives the top adjustment plate 1112 to rotate via the rotating shaft 111, while simultaneously utilizing the transmission structure of pulley 117, transmission belt 118, and pulley 119 to drive the bottom adjustment plate 1111 to rotate synchronously via the connecting shaft 1110. This design can simultaneously adjust the heat distribution on both the upper and lower sides inside the test furnace body 2, effectively improving the heat stratification within the test furnace and making the heat distribution more uniform. This allows for a more accurate simulation of the complex thermal environment faced by fire-retardant coatings in actual fire scenarios, improving the scientific validity and reliability of the test results. The system employs a meshing transmission method involving gear 2 112, rack 2 113, and rack 3 115, as well as a belt drive method involving pulley 1 117, transmission belt 118, and pulley 2 119. This method can accurately transmit power and motion, ensuring the accurate rotation angle of the top adjusting plate 1112. The belt drive also has a buffering and vibration-absorbing effect, reducing impact and vibration during transmission, making the rotation of the bottom adjusting plate 1111 smoother, ensuring the stable operation of the entire synchronous adjusting assembly 11, and improving the stability and repeatability of the test.

[0026] according to Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, a rectangular block 5 is fixedly installed on the upper surface of the base 1. An external gas pipe 6 is installed inside the rectangular block 5. A placement platform 12 is installed inside the test furnace body 2. An extension gas pipe 1 7 is installed inside the external gas pipe 6. An extension gas pipe 2 8 is installed inside the extension gas pipe 1 7. Multiple sets of flame heads 9 are installed inside the extension gas pipe 2 8. The flame heads 9 are located inside the test furnace body 2.

[0027] Specifically, a rectangular block 5 is fixedly installed on the upper surface of the base 1, and an external gas pipe 6 is installed inside the rectangular block 5. This design provides a stable fuel supply channel for the entire experimental furnace. The rectangular block 5 can protect and fix the gas pipe, preventing damage or displacement of the external gas pipe 6 due to external impacts or other factors, ensuring a continuous and stable supply of fuel to the experimental furnace and guaranteeing the smooth progress of the experiment. The external gas pipe 6 is equipped with sequentially arranged extension gas pipe 7 and extension gas pipe 8, forming a multi-stage extension structure. This allows the position of the burner head 9 to be flexibly adjusted according to experimental needs. By controlling the extension or rotation of the extension gas pipes, the position of the burner head 9 within the experimental furnace body 2 can be changed, thereby better simulating fire scenarios in different locations. The multi-stage extension structure also helps to adjust the intensity and distribution of the flame. By controlling the flow rate and pressure of the gas in different extension gas pipes, the size and uniformity of the flame can be controlled, improving the accuracy and repeatability of the test. Multiple sets of burner heads 9 are installed inside extension gas pipe 8, which can simultaneously spray flames, forming a wider and more uniform flame distribution within the experimental furnace body 2. Compared to a single burner head 9, multiple sets of burner heads 9 can more realistically simulate the spread and combustion of flames in actual fires, allowing fire-retardant coatings to be tested for heat insulation performance in an environment closer to actual fires. This results in more accurate and reliable experimental data, providing stronger support for the research and development and application of fire-retardant coatings.

[0028] The overall effect of the mechanism is as follows: A specimen coated with fire-retardant paint is placed on the placement platform 12 inside the test furnace body 2, and the furnace cover 3 is closed. After starting the combustion system, the gas in the external gas pipe 6 passes sequentially through the extended gas pipe 1 7 and extended gas pipe 2 8, and is finally ignited inside the test furnace body 2 by multiple sets of burner heads 9, heating the lower surface of the specimen. During the heating process, the high-temperature flue gas generated in the furnace needs to be discharged through the exhaust control assembly 10: the flue gas flows through the exhaust pipe 101 to the flap valve 102, while the connecting pipe 104 introduces the furnace pressure and acts on the sensing plate 105. When the positive pressure inside the furnace is too high, the sensing plate 105 deforms under force and pushes the support frame 108 and rack 109 to move. The rack 109 drives the gear 107 to rotate, which in turn drives the control rod 106 inside the flap valve 102 to rotate, increasing the opening of the flap valve 102 to enhance exhaust; conversely, when the furnace pressure is too high, the pressure is too low. When there is internal negative pressure, the sensing plate 105 deforms in the opposite direction, causing the rack 109 to move in the opposite direction, causing the gear 107 and the control rod 106 to rotate in the opposite direction, reducing the opening of the flap valve 102 to maintain positive pressure. The power output end of the smoke exhaust control component 10 transmits the meshing force to the synchronous adjustment component 11. The limit block 116, which is fixed to the upper surface of the gear 107, drives the rack 115 to move laterally. The rack 115 drives the rack 113 through the connecting frame 114. The rack 113 then drives the gear 112 and the rotating shaft 111 to rotate. The rotating shaft 111 drives the top adjusting plate 1112 on the upper side of the test furnace body 2 to deflect by an angle. At the same time, through the transmission of pulley 117, transmission belt 118 and pulley 119, the connecting shaft 1110 and the bottom adjusting plate 1111 deflect synchronously. The top adjusting plate 1112 and the bottom adjusting plate 1111 adjust their angles in conjunction with the opening of the flue valve. When the flue gas volume increases and the flap valve 102 opens wider, the top adjusting plate 1112 tilts downward to guide the upper hot flue gas to the lower part, and the bottom adjusting plate 1111 tilts upward to promote mixing and break the stratification of hot flue gas. When the flue gas volume decreases and the flap valve 102 closes, the adjusting plate returns to its original position to maintain laminar flow and reduce heat loss.

[0029] The test furnace body 2 adopts a box-type structure constructed from customized refractory bricks and ceramic fiber modules. The outer shell is welded from Q235B steel plate and coated with high-temperature anti-corrosion paint. The burner head 9 is a proportionally adjustable gas burner head of model RSO-40, arranged on both sides inside the test furnace body 2. The power of a single burner is 80kW. It is ignited by HTS-521 high-voltage ignition transformer. The flame length is adjustable from 200 to 600mm. The flap valve 102 is a D373H-16P type wafer butterfly valve with a nominal diameter of DN300. The valve body is made of SS304 stainless steel and the valve plate is made of 310S heat-resistant steel. The control rod 106 inside it achieves angular stroke adjustment through the meshing of gear 107 and rack 109. The sensing plate 105 is a nickel-chromium alloy corrugated diaphragm. The support frame 108 fixedly installed on its back is rigidly connected to the rack 109. In terms of power supply, the entire system is connected to a three-phase four-wire 380V / 50Hz industrial power supply. After being stepped down and rectified by the distribution box, the power supply is provided to the temperature control instrument of the test furnace body 2, the ignition transformer of multiple sets of burners 9 and the combustion fan. A flexible graphite stuffing box is required between the control rod 106 and the flap valve 102 for sealing and heat insulation. The gear 112, rack 113, rack 115 and rotating shaft 111 in the synchronous adjustment component 11 should be made of nitrided 38CrMoAl alloy steel or fully austenitic heat-resistant steel. The top adjustment plate 1112 and the bottom adjustment plate 1111 should be made of 310S steel plate and stamped with reinforcing ribs.

[0030] Before each test, the elastic deformation capability of the sensing element 105 in the exhaust control assembly 10 must be checked. If permanent deformation or cracks are found, it should be replaced immediately. At the same time, the control lever 106 of the flap valve 102 should be manually rotated to ensure that the valve plate opens and closes flexibly without jamming. The accumulated ash and condensed tar in the exhaust pipe 101 and exhaust pipe 203 should be cleaned to prevent blockage and affect the pressure response sensitivity. When installing the test piece, ensure that the furnace cover 3 closes smoothly through the lifting bracket 4 and is well sealed on all sides to prevent hot flue gas from rushing out from the gaps during the test and directly burning the sensing element 105, which could cause malfunction. Before starting the combustion system, the combustion fan should be started to purge the inside of the test furnace body 2 to confirm that there is no gas accumulation before ignition. During ignition, each burner head 9 should be checked. Observe whether the flame color is a uniform blue. If a long yellow flame or flame detachment occurs, adjust the air-fuel ratio immediately. During the test, it is strictly forbidden to open the furnace cover 3 or touch any moving parts of the synchronous adjustment component 11. At the same time, monitor the smoothness of the linkage angle change between the top adjustment plate 1112 and the bottom adjustment plate 1111 through the observation window. If jamming is found, stop the test immediately and cool down for repair. After the test, continue to run the exhaust system until the internal temperature of the test furnace body 2 drops below 200℃. After turning off the gas and power, wait for the furnace body to cool naturally to room temperature before cleaning the internal ash and slag. Check the sealing of the flap valve 102 and the elasticity of the sensing plate 105 again, and record the wear of each transmission component for regular maintenance.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fire-retardant coating heat insulation efficiency testing furnace, characterized in that: The furnace includes a base (1), on the upper surface of which a test furnace body (2) is mounted. A furnace cover (3) is mounted inside the top of the test furnace body (2). Lifting brackets (4) are fixedly mounted on both sides of the upper surface of the furnace cover (3). A smoke exhaust control component (10) is mounted at the smoke exhaust port of the furnace cover (3). The smoke exhaust control component (10) adjusts the smoke output in real time according to the pressure change of the test furnace body (2). A synchronous adjustment component (11) is mounted at the power output end of the smoke exhaust control component (10) to convert the meshing force into the adjustment force. The synchronous adjustment component (11) adjusts the heat stratification inside the test furnace body (2) synchronously through the connector. The synchronous adjustment assembly (11) includes a rotating shaft (111), a gear (112), a rack (113), a connecting frame (114), a rack (115), a limiting block (116), and a top adjusting plate (1112). The outer surface of the rotating shaft (111) is rotatably mounted to the inner wall of the base (1). The interior of the gear (112) is fixedly mounted to the outer surface of one end of the rotating shaft (111). The lower surface of the rack (113) is fixedly mounted to the outer surface of the gear (111). 12) The outer surface of the connecting frame (114) is engaged with the bottom of the rack two (113) and fixedly installed on the upper surface of the rack three (115). The left side of the rack three (115) is fixedly installed on the right side of the connecting frame (114). The inner wall of the limiting block (116) is slidably connected to the outer surface of the rack three (115). One side of the top adjusting plate (1112) is fixedly installed on the outer surface of the rotating shaft one (111), and the top adjusting plate (1112) is set on the upper side inside the test furnace body (2).

2. The fire-retardant coating heat insulation efficiency test furnace according to claim 1, characterized in that: The exhaust control assembly (10) includes an exhaust pipe (101), a flap valve (102), a connecting pipe (104), a sensing plate (105), a control rod (106), a gear (107), and a rack (109). One end of the exhaust pipe (101) is fixedly installed on the top of the interior of the test furnace body (2). The inlet of the flap valve (102) is fixedly installed on the other end of the exhaust pipe (101). One side of the connecting pipe (104) is connected to the interior of the exhaust pipe (101). The sensing plate (105) is fixedly installed on all four sides of the inner wall of the connecting pipe (104). The outer surface of the control rod (106) is controlled and installed inside the flap valve (102). The interior of the gear (107) is fixedly installed on the outer surface of the control rod (106). The right side of the rack (109) meshes with the outer surface of the gear (107).

3. The fire-retardant coating heat insulation efficiency test furnace according to claim 2, characterized in that: A support frame (108) is fixedly installed on the back of the sensing plate (105), and the right side of the support frame (108) is fixedly installed on the left side of the rack (109).

4. The fire-retardant coating heat insulation efficiency test furnace according to claim 2, characterized in that: The flue valve (102) is equipped with a second smoke exhaust pipe (103) at its smoke outlet end.

5. The fire-retardant coating heat insulation efficiency test furnace according to claim 2, characterized in that: The bottom of the limiting block (116) is fixedly installed on the upper surface of the gear (107), and a pulley (117) is fixedly installed on the outer surface of one end of the rotating shaft (111).

6. The fire-retardant coating heat insulation efficiency test furnace according to claim 5, characterized in that: A transmission belt (118) is mounted on the outer surface of the first pulley (117), and a second pulley (119) is mounted on the inner ring of the transmission belt (118).

7. A fire-retardant coating heat insulation efficiency testing furnace according to claim 6, characterized in that: The inner side of the pulley 2 (119) is fixedly installed with the connecting shaft 2 (1110). The outer surface of the connecting shaft 2 (1110) is rotatably installed with the inner wall of the test furnace body (2). The outer surface of the connecting shaft 2 (1110) is fixedly installed with the bottom adjustment plate (1111).

8. The fire-retardant coating heat insulation efficiency test furnace according to claim 1, characterized in that: A rectangular block (5) is fixedly installed on the upper surface of the base (1), and an external gas pipe (6) is installed inside the rectangular block (5). A placement platform (12) is installed inside the test furnace body (2).

9. A fire-retardant coating heat insulation efficiency test furnace according to claim 8, characterized in that: An extension gas pipe (7) is installed inside the external gas pipe (6), and an extension gas pipe (8) is installed inside the extension gas pipe (7). Multiple sets of burners (9) are installed inside the extension gas pipe (8), and the burners (9) are located inside the test furnace body (2).

Images