A sloping flow fire test apparatus with a bottom oil sump

Abstract

The utility model provides a adjustable gradient's trickling fire test device with bottom oil collection pool relates to fire safety experimental equipment technical field, include: support frame, oil collection pool, support device, its setting on support frame and one end is connected with oil collection pool, support device forms acute angle slope on support frame, support device includes guide rail, two support pieces, two supports and drive structure, every support piece includes slip platform, support seat and rotary apron, guide rail sets up on support frame, support seat one end is connected with rotary apron rotation, other end and slip platform are connected, slip platform can slide along the travel direction of guide rail. The utility model has the advantages of: through the precision mechanical system of support frame and guide rail, slip platform, gear and rack drive mechanism, realized the high accuracy stepless regulation of gradient, satisfies the sensitive demand of trickling fire test to the small gradient change.

Description

Technical Field

[0001] This utility model relates to the technical field of fire safety experimental equipment, and in particular to a flowing fire test device with an adjustable slope and a bottom oil collection tank. Background Technology

[0002] Flowing fires, as a typical type of fire formed after liquid fuel leakage, are widely found in industrial facilities, storage areas, substations, and ship decks. Their spread is closely related to the terrain slope and the state of fuel retention, making them a core subject of fire prevention and control technology research.

[0003] The initiation, acceleration, and stable spread of flowing fire are extremely sensitive to changes in slope, especially in the small slope range of 0° to 15°. The flow rate and combustion rate increase exponentially with the slope, and a slope deviation of ±0.5° can lead to errors in the prediction of flame spread rate. The commonly used method of manual mechanical adjustment is to test flowing fire, which cannot achieve online, continuous, and stepless adjustment of the slope during the experiment. This limits the exploration of the evolution law of flowing fire behavior under dynamic slope conditions. Therefore, it is urgent to develop a test device with precise slope adjustment. Utility Model Content

[0004] In view of this, the present invention provides a flowing fire test device with an adjustable slope and a bottom oil collection pool, which solves the technical problem that existing flowing fire test devices cannot accurately adjust the slope online.

[0005] An embodiment of this utility model provides a flow fire testing device with an adjustable slope and a bottom oil collection tank, comprising: Supporting framework; Oil collection tank; A support device is mounted on the support frame and connected at one end to the oil collection tank. The support device forms an acute-angled ramp on the support frame. The support device includes a guide rail, two support members, two brackets, and a drive structure. Each support member includes a sliding platform, a support seat, and a rotating plate. The guide rail is mounted on the support frame. One end of the support seat is rotatably connected to the rotating plate, and the other end is connected to the sliding platform. The sliding platform can slide along the travel direction of the guide rail. The drive structure is located at the lower part of the sliding platform to drive the sliding platform to slide relative to the guide rail. A combustion platform is placed on the slope formed by the support device and communicates with the top of the oil collection tank so that the fuel passing through the combustion platform flows into the oil collection tank. The detection device includes a gas analyzer, multiple thermocouples, a camera, an infrared thermal imager, and a laser rangefinder, with the multiple thermocouples mounted on the combustion platform.

[0006] Furthermore, the drive structure includes a motor, a gear, and a rack. The rack is disposed on the support frame and located inside the guide rail. The motor is disposed at the lower part of the sliding platform and its output end is connected to the gear. The gear rotates and meshes with the rack teeth. The motor drives the gear to rotate, causing the gear to move along the length direction of the rack.

[0007] Furthermore, the surface of the bracket is provided with a guide groove, and a sliding plate with a convex cross-section is slidably connected to the outside of the bracket. The rotating support plate is connected to the sliding plate, and the sliding plate and the bracket form a sliding pair.

[0008] Furthermore, baffles are welded to both sides of the combustion platform, and the two baffles and the combustion platform are connected to form a U-shaped groove, with multiple thermocouples disposed on the two baffles.

[0009] Furthermore, the two flanges are hinged to provide a protective cover that can be opened and closed to cover the upper surface of the combustion platform. The protective cover can be opened and closed relative to the combustion platform.

[0010] Furthermore, it also includes an electronic scale, an oil drum, and an oil supply structure. The oil drum is placed on the electronic scale, and the oil drum is connected to the combustion platform through the oil supply structure, so that the fuel in the oil drum can be pumped to the combustion platform.

[0011] Furthermore, both ends of the bracket are provided with hinges, the movable end of the hinge is connected to the side of the oil collection tank, and the other end of the bracket is connected to a support platform through the hinge. The support platform is connected to the guide rail through a guide member, so that the support platform can slide relative to the guide rail and change the distance.

[0012] Furthermore, the guide component includes a guide cylinder and a sliding platform, which is slidably connected to the guide rail. One end of the guide cylinder is connected to the sliding platform, and the other end is connected to the support platform.

[0013] Furthermore, one end of the combustion platform extends to the support platform and is placed thereon, while the other end abuts against the oil collection tank. The combustion platform is provided with sealing elements at the bends of both the support platform and the oil collection tank.

[0014] Furthermore, the upper part of the oil collection tank is U-shaped and recessed inward, and an oil drain valve is provided at the lowest point of the recess.

[0015] The beneficial effects of the technical solution provided by the embodiments of this utility model are as follows: The adjustable slope flowing fire test device with bottom oil collection pool of this utility model achieves high-precision stepless adjustment of the slope through a precision mechanical system composed of a support frame, guide rail, sliding platform, and gear and rack drive mechanism, meeting the sensitive requirements of flowing fire test for small slope changes; the closed fuel flow guiding system composed of U-shaped combustion platform, sidewall, high-temperature resistant sealing strip, oil guide slope, oil collection pool and oil drain valve, combined with electronic scale for precise measurement, achieves a fuel recovery efficiency of over 96% and a combustion efficiency evaluation error of ≤2%, ensuring accurate and reliable mass conservation calculation; it integrates multi-dimensional detection equipment such as thermocouple array, infrared thermal imager, laser rangefinder sensor, gas analyzer, and high-definition camera, and collects data synchronously with the central controller via bus, with a synchronization timestamp accuracy of ≤1ms, providing complete data support for the study of flowing fire spread mechanism and providing a fully functional and high-performance test platform for flowing fire safety scientific research. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the flow fire test device with adjustable slope and bottom oil collection tank of this utility model. Figure 2 This is a partial structural schematic diagram of the flow fire test device with adjustable slope and bottom oil collection tank of this utility model. Figure 3 This is another perspective schematic diagram of the structure of the flow fire test device with adjustable slope and bottom oil collection pool of this utility model.

[0017] In the diagram: 1. Support frame; 2. Oil collection tank; 201. Oil drain valve; 3. Bracket; 31. Guide groove; 32. Hinge; 4. Support platform; 5. Combustion platform; 6. Side rail; 7. Slide plate; 8. Rotating pallet; 9. Support base; 10. Guide rail; 11. Sliding platform; 12. Rack; 13. Motor; 14. Gear; 15. Guide cylinder; 16. Gas analyzer; 17. Thermocouple; 18. Camera; 19. Infrared thermal imager; 20. Laser rangefinder sensor; 21. Electronic scale; 22. Oil drum. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings. The following description presents a preferred embodiment of several possible embodiments of this utility model, intended to provide a basic understanding of the utility model, but not intended to identify the key or decisive elements of the utility model or to limit the scope of protection sought.

[0019] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0020] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures. Also, it should be understood that, for ease of description, the dimensions of the various parts shown in the figures are not drawn to actual scale.

[0022] In the description of this utility model, it should be noted that the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated. The content protected by this utility model does not involve any improvement to the internal structure and method.

[0023] It should be further noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Please refer to Figures 1 to 3 The present invention provides a flowing fire test device with an adjustable slope and a bottom oil collection tank, including a support frame 1, an oil collection tank 2, a support device, a combustion platform 5, a testing device, an electronic scale 21, and an oil drum 22.

[0025] The support frame 1 serves as the load-bearing base, and is made of 100mm×100mm×5mm 304 stainless steel square tubes spliced ​​together by argon arc welding. The bottom of the frame is welded with a 10mm thick carbon steel plate as the base, and is fixedly connected to the ground foundation by M16 expansion bolts to ensure the structural stability of the whole machine under test vibration and thermal stress. The entire surface of the frame is sprayed with a high temperature resistant epoxy anti-corrosion paint with a thickness of 80μm, which can withstand long-term high temperature heat radiation without peeling or cracking.

[0026] In the top region of the support frame 1, two guide rails 10 are arranged symmetrically along the longitudinal direction. The guide surfaces are covered with a molybdenum disulfide solid lubricant coating to significantly reduce the coefficient of friction (μ≤0.08) and motion noise (≤55dB) of the sliding platform 11 under heavy load conditions.

[0027] The guide rail 10 is fixedly connected to the mounting base on the top of the support frame 1 by M12 stainless steel hexagonal screws. A 3mm thick polytetrafluoroethylene (PTFE) damping pad is sandwiched between the mounting base and the guide rail 10 to absorb high-frequency vibrations during motor 13 operation, ensuring smoothness and positioning accuracy during slope adjustment. Polyurethane elastic limit blocks are installed at both ends of the guide rail 10, which are screwed onto the guide rail end face to prevent the sliding platform 11 from accidentally derailing.

[0028] Please refer to Figure 1 As the core component for fuel collection and temporary storage, the oil collection tank 2 is made of 3mm thick 316L stainless steel plate, which is laser-cut, bent and then argon-arc welded. The weld is inspected by X-ray non-destructive testing. The upper part of the oil collection tank 2 has a U-shaped concave structure, forming an effective fuel flow space.

[0029] The top opening edge of the oil collection tank 2 is folded outward horizontally by 30mm. The lower surface of the folded edge is connected to the upper surface of the crossbeam of the support frame 1 by M8 stainless steel bolts. A 2mm thick oil-resistant silicone sealing ring is set at the connection interface to ensure that fuel does not leak from the connection gap.

[0030] The inner wall of the oil collection tank 2 is coated with a 0.5mm thick polytetrafluoroethylene (PTFE) high-temperature resistant and corrosion-resistant coating. This coating is prepared by plasma spraying and has a porosity of ≤1.5%. It can withstand extreme temperature cycles from -196℃ to +260℃ and has excellent chemical inertness to hydrocarbon fuels such as gasoline, diesel, and aviation kerosene, avoiding corrosion of the tank wall by sulfides and nitrides in the fuel. The bottom of the oil collection tank 2 is welded with a 5° slope oil guide ramp by argon arc welding. The surface of the ramp is polished and the roughness Ra≤0.4μm, ensuring that the fuel flows quickly to the lowest point of the drain valve 201 installation position under the action of gravity.

[0031] Furthermore, the drain valve 201 is installed at the lowest point of the oil collection tank 2, and the valve seat sealing surface is overlaid with STL hard alloy, which can withstand a maximum operating temperature of 550°C and a nominal pressure of PN16, ensuring sealing reliability when high-temperature oil is discharged.

[0032] In addition, the inlet end of the drain valve 201 is connected to the wall plate of the oil collection tank 2 through the Rc1 / 2 tapered pipe thread of GB / T 7306.1 standard. The thread engagement is wrapped with polytetrafluoroethylene raw material tape and coated with high temperature resistant sealant to prevent thread micro-leakage.

[0033] A PTFE protective cover is fitted to the outside of the valve. The cover is connected to the valve body flange by M6 screws. When the valve is not in use, it is sealed to prevent dust and impurities from entering the valve cavity.

[0034] In this embodiment, the support device is an actuator that enables precise slope adjustment. The entire device forms an adjustable acute-angle slope on the support frame 1. The support device includes the aforementioned guide rail 10, two sets of symmetrically arranged support members, two brackets 3, and a drive structure.

[0035] Each support consists of a sliding platform 11, a support base 9, and a rotating support plate 8. The sliding platform 11 is the core for bearing and sliding. Two sets of inverted T-shaped sliders are fixedly connected to its lower surface by bolts. The sliders are precisely matched with the guide rail 10, which not only ensures the smoothness of sliding but also effectively limits lateral swaying.

[0036] Furthermore, a motor 13 is fixedly mounted at the center of the lower surface of the sliding platform 11 by four M8 hexagon socket screws. The motor 13 is preferably a 57 stepper motor. The output shaft is fixed to the gear 14 by a key connection. The gear 14 and the rack 12 fixed on the support frame 1 form a precision meshing transmission.

[0037] Motor 13 drives gear 14 to rotate, and gear 14 moves linearly along the length of rack 12, thereby driving sliding platform 11 to achieve high-precision and high-rigidity linear displacement on guide rail 10.

[0038] The support base 9 is fixedly connected to the mounting boss on the upper surface of the sliding platform 11 by four M10 high-strength bolts. A Φ10mm locating pin hole is provided at the connection interface, and a cylindrical locating pin is pressed in to ensure that the relative position of the support base 9 and the sliding platform 11 does not move under impact load.

[0039] A Φ30mm through hole is machined on the upper vertical wall of the support base 9. A self-lubricating copper alloy bushing is installed in the hole. The inner diameter of the bushing is clearance-fitted with the rotating shaft of the rotating support plate 8. The end of the rotating shaft is axially limited by a shaft elastic retaining ring. The rotating support plate 8 can be tilted around the rotating shaft on the support base 9.

[0040] The surface of the bracket 3 is milled with a guide groove 31. The cross-section of the guide groove 31 is convex. The surface roughness Ra of the guide groove 31 is ≤1.6μm to ensure the smooth sliding of the slide plate 7.

[0041] The cross-section of the slide plate 7 is a matching convex shape, and its shoulder is embedded in the guide groove 31 to form a sliding pair. The outer surface of the slide plate 7 (the contact surface with the outer wall of the bracket 3) is machined with an oil reservoir. Before the test, it is coated with molybdenum disulfide lithium-based grease to form a long-lasting lubricating film, which significantly reduces frictional resistance.

[0042] Please refer to Figure 1 and Figure 2In this embodiment, the combustion platform 5 is a key component that directly bears the fuel and flame. Its structural strength, surface characteristics, and sealing performance directly affect the authenticity and safety of the test data. The combustion platform 5 uses a 10mm thick 316L stainless steel plate as the base. After being laser-cut, its upper surface is sandblasted (shot peening particle size 0.3-0.5mm) to form a uniform and dense micro-rough structure with a surface roughness Ra of 3.2-6.4μm, effectively enhancing the adhesion of the Al2O3 anti-slip and wear-resistant coating.

[0043] The Al2O3 coating was prepared using a plasma spraying process, with a coating thickness of 0.3 mm, a microhardness of HV0.3 ≥ 900, and a bonding strength between the coating and the substrate ≥ 30 MPa (tested according to ASTM C633 standard). This coating not only endows the combustion platform 5 with excellent high-temperature oxidation resistance (able to withstand long-term flame erosion at 1200℃), but its ceramic properties also enable the fuel to form a stable liquid film flow on the platform surface, avoiding local accumulation or flow interruption of fuel due to poor wetting, and significantly improving the stability and repeatability of the flowing fire propagation process.

[0044] Both sides of the combustion platform 5 are continuously welded with baffles 6 by argon arc welding. The baffles 6 and the combustion platform 5 together form a U-shaped channel structure, which can ensure that fuel will not overflow from the side under the conditions of maximum fuel flow (100mL / min) and maximum slope. The four corners of the bottom of the U-shaped channel are rounded to eliminate stress concentration and facilitate smooth fuel flow.

[0045] In this embodiment, the detection device includes a gas analyzer 16, multiple thermocouples 17, a camera 18, an infrared thermal imager 19, and a laser rangefinder 20. Each detection device is connected to a central controller (not shown in the figure) via an RS485 bus to achieve synchronous data acquisition and storage.

[0046] The gas analyzer 16 preferably uses the MRU VARIO PLUS industrial gas analyzer, which can simultaneously detect O2, CO, CO2, and NO. x The detection limit for various combustion products such as H2S and SO2 is as low as 1 ppm, with a response time T. 90 ≤30s. The sampling probe of the gas analyzer 16 extends 500mm above the combustion platform 5 through a PTFE sampling tube with an inner diameter of Φ6mm. The outside of the sampling tube is also covered with an aluminum silicate fiber insulation layer. The sampling probe is mounted on a three-degree-of-freedom robotic arm, which can flexibly adjust the sampling position to obtain flue gas composition at different heights and lateral positions.

[0047] The infrared thermal imager 19 employs a FLIR A655SC research-grade thermal imager, with an uncooled vanadium oxide (VOx) microbolometer detector. It has a pixel resolution of 640×480, a temperature range of -20℃ to +1200℃, a measurement accuracy of ±2% or ±2℃ (whichever is greater), and a thermal sensitivity (NETD) ≤30mK. The infrared thermal imager 19 is mounted laterally on the support frame 1 using a dedicated aluminum alloy frame, and its field of view covers the entire length of the combustion platform 5. The infrared thermal imager 19 connects to the central controller via a gigabit Ethernet interface, enabling real-time transmission and storage of video streams and temperature data.

[0048] Camera 18 employs a near-infrared enhanced high-speed camera with a resolution of 2048×2048 pixels and a maximum frame rate of 90fps. Equipped with a 50mm fixed-focus lens (F1.4 aperture), it can clearly capture the microscopic structure and dynamic evolution of flames. Camera 18 is mounted on a three-axis gimbal, which allows for 360° horizontal rotation and ±90° pitch rotation, facilitating adjustment of the shooting angle. Camera 18 connects to the central controller via a USB 3.0 interface.

[0049] A laser rangefinder sensor 20 is mounted on the side of the combustion platform 5 via an L-shaped bracket for real-time monitoring of changes in fuel film thickness. The bracket is equipped with a fine-tuning mechanism to precisely adjust the projection position of the laser beam. Multiple thermocouples 17 are Φ3mm armored K-type thermocouples, with their temperature-sensing ends connected to pre-machined threaded holes on the flange 6 via M6×0.5mm threads, and are equidistantly arranged along the length of the combustion platform 5.

[0050] The temperature-sensing junction of thermocouple 17 passes through the baffle 6 and extends 5mm above the combustion platform 5 to accurately measure the flame front temperature. The cold junction of thermocouple 17 is connected to the data acquisition instrument via a compensating wire. The compensating wire is covered with a high-temperature resistant fiberglass braided sheath, which is then wrapped with a stainless steel corrugated tube to achieve electromagnetic shielding and mechanical protection. A 2mm thick ceramic fiber gasket is pressed between the mounting base of thermocouple 17 and the baffle 6 to prevent heat from affecting the measurement accuracy through heat conduction, while also ensuring the sealing of the threaded connection to prevent fuel leakage from the mounting hole.

[0051] To further enhance safety, an openable protective cover (not shown separately in the attached diagram, located above the combustion platform 5) is rotatably mounted on the outer upper edge of both side guards 6 via stainless steel hinges. The hinge pivot is made of stainless steel pin, with a PTFE bushing embedded between the pin and the pivot hole to ensure smooth and unobstructed opening and closing of the protective cover. The entire protective cover is constructed by bonding 12mm thick tempered glass (compliant with GB 15763.2 standard) to an aluminum alloy frame. UV-cured adhesive is used to bond the glass and the frame, resulting in high bonding strength and excellent temperature resistance.

[0052] The protective cover has an opening angle range of 0°-120°, completely covering the upper surface of the combustion platform 5, effectively blocking fuel splashes, flame ejection, and high-temperature heat radiation from harming operators during combustion. A 3mm thick silicone rubber sealing strip is affixed to the lower edge of the protective cover's frame. When the protective cover is closed, the sealing strip fits tightly against the upper surface of the edge 6, forming an effective seal to prevent toxic fumes generated during combustion from escaping into the experimental environment.

[0053] To ensure the accuracy of fuel supply and mass conservation calculations during the flowing fire test, this device is also equipped with a closed-loop fuel supply and metering system consisting of an electronic scale 21, an oil drum 22, and a fuel supply structure. The electronic scale 21 is an industrial-grade explosion-proof electronic scale with a range of 60 kg and an accuracy of 0.1 g. Its weighing sensor is an electromagnetic force-compensated sensor, which has extremely high resolution and stability.

[0054] Oil drum 22 is a 20L capacity stainless steel sealed oil drum made of 316L steel with a wall thickness of 2mm. The lid is sealed to the drum body with M10 quick-release bolts, and a DN15 stainless steel connector is welded to the center of the lid for connecting the oil supply line. Oil drum 22 is placed in the center of the weighing platform of electronic scale 21. A 5mm thick PTFE insulating pad is laid between the bottom of the drum and the weighing platform to prevent static electricity accumulation and to avoid weighing errors caused by uneven drum bottoms.

[0055] The oil supply system consists of a BT100L peristaltic pump, a DN15 stainless steel flow regulating valve, PTFE oil pipelines, and pipeline accessories. The peristaltic pump head is a YZ1515x type, and the pump tubing is platinum-cured silicone tubing (inner diameter 6.4mm, wall thickness 2.4mm). Its flow rate is continuously adjustable from 0-100mL / min with a flow accuracy of ±1%. It receives commands from the central controller via an RS485 interface to achieve remote start / stop and flow rate adjustment.

[0056] The peristaltic pump is driven by a stepper motor with a power supply voltage of 24VDC and a power of 50W. The pump body is fixed to the frame on top of the oil drum 22 with screws. The DN15 stainless steel flow regulating valve is a needle valve with a valve body made of CF8M and a valve stem made of 316 stainless steel. It is connected to the oil pipeline by threads and is used for manual fine-tuning of fuel flow to ensure accurate and stable flow.

[0057] The PTFE (polytetrafluoroethylene) oil pipeline is DN15 (15mm inner diameter, 2mm wall thickness), with a temperature range of -80℃ to +260℃, and can withstand corrosion from all chemical components of the fuel. After exiting the peristaltic pump outlet, the oil pipeline runs upwards along the outer side of the support frame 1's columns and is secured with stainless steel pipe clamps (300mm spacing). To prevent thermal damage to the pipeline from high combustion temperatures, the pipeline is uniformly covered with a 5mm thick aluminum silicate fiber insulation layer (temperature resistance 1260℃), and then sealed with aluminum foil tape to form a complete thermal insulation protection system.

[0058] The fuel pipeline extends 100mm above the feed end of the combustion platform 5, and a stainless steel atomizing nozzle (0.5mm orifice) is installed at the pipe opening to spray fuel into uniform droplets onto the surface of the combustion platform 5, ensuring uniform fuel distribution in the initial stage of the flowing fire. The pipeline and the nozzle are connected by a quick-connect coupling for easy disassembly and cleaning.

[0059] Please refer to Figure 2 In this embodiment, the support platform 4 serves as the support point at the upstream end of the combustion platform 5. Both ends of the bracket 3 are provided with hinges 32. The hinges 32 are preferably heavy-duty stainless steel spherical bearings. The inner ring of the bearing is interference-fitted with the stepped shaft at the end of the bracket 3, and the outer ring is connected to the mounting support on the side of the oil collection tank 2 through threads. This can adapt to the pitch angle change of the bracket 3 during the slope adjustment process, ensuring flexible rotation and no axial movement.

[0060] The other end of the bracket 3 is connected to the support platform 4 via another set of hinges 32. The support platform 4 has a rectangular structure and is used to support one end of the combustion platform 5. The bottom surface of the support platform 4 is fixedly connected to the guide.

[0061] It should be noted that the guide component includes a guide cylinder 15 and a sliding platform 11 slidably connected to the guide rail 10. The lower end of the guide cylinder 15 is welded to the upper surface of the sliding platform 11, and the upper end of the guide cylinder 15 is inserted into the guide hole at the bottom of the support platform 4, with a clearance fit between the guide cylinder 15 and the support platform 4. The support platform 4 can slide up and down and rotate slightly relative to the guide cylinder 15, thereby adapting to the flexural deformation of the combustion platform 5 when the slope changes.

[0062] The sliding platform 11 connected to the guide cylinder 15 has the same structure as the sliding platform 11 in the aforementioned support member.

[0063] One end of the combustion platform 5 extends to the support platform 4 and is placed on it. The other end of the combustion platform 5 abuts against the oil collection tank 2. Specifically, the downstream end of the combustion platform 5 rests directly on the flange of the top opening of the oil collection tank 2, and the contact surface is in line contact.

[0064] To prevent fuel leakage at the joints, seals are installed at the bends between the combustion platform 5 and the support platform 4, and at the contact points between the combustion platform 5 and the oil collection tank 2. These seals are attached to the vertical wall of the support platform 4 and the upper surface of the flange of the oil collection tank 2 using high-temperature resistant double-sided adhesive. Once the combustion platform 5 is in place, its own weight compresses the seals by 30%-40%, forming a reliable elastic seal that effectively prevents fuel leakage from the joints.

[0065] In addition, a PT100 temperature sensor (model: WZP-230) installed on the side wall of the oil collection tank accurately monitors the oil temperature inside the tank. It is connected to the wall plate of the oil collection tank 2 via an M14×1.5 thread, and the threaded connection is sealed with a copper sealing gasket. The temperature signal is connected to the central controller module. When the oil temperature exceeds the preset threshold of 180℃, the controller triggers an audible and visual alarm.

[0066] In an optional embodiment, a conical smoke collection hood made of 0.8mm thick 304 stainless steel plate is also installed on the top of the support frame 1. The collection hood is connected to a stainless steel pipe via a flange, and the pipe is covered with a rock wool insulation layer. An activated carbon exhaust gas treatment device is connected to the end of the pipe. This device has a two-stage filtration structure: the first stage is a stainless steel wire mesh demister to remove large oil droplets; the second stage is an activated carbon adsorption bed, using columnar coal-based activated carbon (iodine value ≥900mg / g) with a bed thickness of 300mm. The treated exhaust gas is drawn to the outside by a centrifugal fan (air volume 500m³ / h), and the emission concentration meets the relevant limit requirements in GB16297-1996 "Integrated Emission Standard for Air Pollutants".

[0067] The typical experimental procedure is as follows: Test preparation stage: Zero the electronic scale 21, fill the oil drum 22 with test fuel (such as 92# gasoline), and record the initial mass; according to the test plan, set the target slope (such as 15°) and fuel flow rate (such as 50mL / min) through the host computer software. The controller automatically calculates the number of pulses of the motor 13 and drives it to run. The gear 14 rolls on the rack 12, driving the sliding platform 11 to be precisely positioned so that the bracket 3 reaches the predetermined tilt angle. At this time, the slope of the combustion platform 5 is the target value, and the tilt angle error is ≤±0.1°; check the tightness of the seals at both ends; install the thermocouple 17 into the threaded hole of the flange 6, and adjust the projection position of the laser rangefinder 20; turn on the infrared thermal imager 19, camera 18, and gas analyzer 16, and preheat for 30 minutes.

[0068] During the fuel supply and ignition phase: the peristaltic pump is started, and fuel is delivered to the atomizing nozzle at the upstream end of the combustion platform 5 through the fuel pipeline at a set flow rate. Under the action of gravity, the fuel flows downward along the surface of the combustion platform 5, forming a stable liquid film. The electronic scale 21 records the mass change of the oil drum 22 in real time, with a data update frequency of 10Hz. After the fuel has filled the entire combustion platform 5 and flowed into the oil collection pool 2, an electronic igniter (such as a high-voltage arc ignition gun) is used to ignite the fuel at the upstream end of the combustion platform 5. The ignition energy is 10J to ensure reliable ignition.

[0069] Data Acquisition Phase: After ignition, the flame spreads downstream on the surface of combustion platform 5. Thermocouple array 17 monitors the temperature field distribution of the flame front in real time; infrared thermal imager 19 acquires flame temperature distribution images at a frame rate of 30Hz and displays them through temperature-color pseudo-color encoding; laser rangefinder 20 measures fuel film thickness at a frequency of 1kHz to assess fuel consumption rate; camera 18 records macroscopic features such as flame shape, color, and pulsation frequency at a frame rate of 50fps; gas analyzer 16 continuously analyzes flue gas composition and calculates combustion efficiency and pollutant generation rate; electronic scale 21 monitors fuel supply quality in real time. All data is synchronized via the PLC's real-time clock and stored in the host computer's solid-state drive.

[0070] End of Experiment and Post-processing Stage: After the predetermined time has elapsed or the flame has spread to the end of combustion platform 5, the peristaltic pump is shut off to stop the fuel supply. After the flame self-extinguishes, the combustion platform 5 is allowed to cool to room temperature. The drain valve 201 is opened to discharge the unburned fuel collected in the oil collection tank 2 into the waste oil recovery container, and the mass of the recovered fuel is weighed. Based on the law of conservation of mass and the combustion time, the mass combustion rate can be accurately calculated. The collected temperature, image, and video data are post-processed and analyzed to extract key parameters such as flame spread rate, flame height, and combustion intensity.

[0071] In this document, the directional terms such as front, back, top, and bottom are defined based on the position of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that these are relative concepts and can vary depending on different methods of use and placement; the use of these directional terms should not limit the scope of protection claimed in this application.

[0072] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0073] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flow fire testing device with an adjustable slope and a bottom oil collection tank, characterized in that, include: Supporting framework (1); Oil collection tank (2); A support device is provided on the support frame (1) and one end is connected to the oil collection tank (2). The support device forms an acute-angle ramp on the support frame (1). The support device includes a guide rail (10), two support members, two brackets (3) and a drive structure. Each support member includes a sliding platform (11), a support seat (9) and a rotating tray (8). The guide rail (10) is provided on the support frame (1). One end of the support seat (9) is rotatably connected to the rotating tray (8), and the other end is connected to the sliding platform (11). The sliding platform (11) can slide along the travel direction of the guide rail (10). The drive structure is provided at the lower part of the sliding platform (11) to drive the sliding platform (11) to slide relative to the guide rail (10). Combustion platform (5) is placed on the slope formed by the support device and communicates with the oil collection tank (2) above, so that the fuel passing through the combustion platform (5) flows into the oil collection tank (2). The detection device includes a gas analyzer (16), multiple thermocouples (17), a camera (18), an infrared thermal imager (19), and a laser rangefinder (20), with the multiple thermocouples (17) mounted on the combustion platform (5).

2. The flow fire test device with adjustable slope and bottom oil collection tank as described in claim 1, characterized in that: The drive structure includes a motor (13), a gear (14) and a rack (12). The rack (12) is located on the support frame (1) inside the guide rail (10). The motor (13) is located at the lower part of the sliding platform (11) and its output end is connected to the gear (14). The gear (14) rotates and meshes with the teeth of the rack (12). The motor (13) drives the gear (14) to rotate, so that the gear (14) moves along the length direction of the rack (12).

3. The flow fire test device with adjustable slope and bottom oil collection tank as described in claim 1, characterized in that: The surface of the bracket (3) is provided with a guide groove (31), and a sliding plate (7) with a convex cross section is slidably connected to the outside of the bracket (3). The rotating support plate (8) is connected to the sliding plate (7), and the sliding plate (7) and the bracket (3) form a sliding pair.

4. The flow fire test apparatus with adjustable slope and bottom oil collection tank as described in claim 1, characterized in that: Both sides of the combustion platform (5) are welded with baffles (6), and the two baffles (6) and the combustion platform (5) are connected to form a U-shaped groove. Multiple thermocouples (17) are arranged on the two baffles (6).

5. The flow fire test apparatus with adjustable slope and bottom oil collection tank as described in claim 4, characterized in that: The two flanges (6) are hinged to provide a protective cover that can be opened and closed to cover the upper surface of the combustion platform (5). The protective cover can be opened and closed relative to the combustion platform (5).

6. The flow fire test apparatus with adjustable slope and bottom oil collection tank as described in claim 1, characterized in that: It also includes an electronic scale (21), an oil drum (22) and an oil supply structure. The oil drum (22) is placed on the electronic scale (21). The oil drum (22) is connected to the combustion platform (5) through the oil supply structure, so that the fuel in the oil drum (22) can be pumped to the combustion platform (5).

7. The flow fire test apparatus with adjustable slope and bottom oil collection tank as described in claim 1, characterized in that: Both ends of the bracket (3) are provided with hinges (32). The movable end of the hinge (32) is connected to the side of the oil collection tank (2). The other end of the bracket (3) is connected to a support platform (4) through the hinge (32). The support platform (4) is connected to the guide rail (10) through a guide, so that the support platform (4) can slide relative to the guide rail (10) and change the distance.

8. The flow fire test apparatus with adjustable slope and bottom oil collection tank as described in claim 7, characterized in that: The guide includes a guide cylinder (15) and a sliding platform (11), which is slidably connected to the guide rail (10). One end of the guide cylinder (15) is connected to the sliding platform (11), and the other end is connected to the support platform (4).

9. The flow fire test apparatus with adjustable slope and bottom oil collection tank as described in claim 7, characterized in that: One end of the combustion platform (5) extends to the support platform (4) and is placed on it, while the other end abuts against the oil collection tank (2). The combustion platform (5) is provided with sealing elements at the bends of the support platform (4) and the oil collection tank (2).

10. The flow fire test apparatus with adjustable slope and bottom oil collection tank as described in claim 1, characterized in that: The upper part of the oil collection tank (2) is U-shaped and recessed inward. The oil collection tank (2) is provided with an oil drain valve (201) at the lowest point of the recess.

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