Device for testing flame retardant property of material
By designing a highly compatible material flame retardant performance testing device, the problems of cumbersome and long testing cycles of existing testing methods have been solved, and rapid and effective evaluation of samples of different forms has been achieved, shortening the R&D cycle and improving testing efficiency.
Patent Information
- Application Number
- CN202521931351.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-09
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2035-09-09
AI Technical Summary
Existing testing methods for the flame retardant properties of low-smoke halogen-free materials are cumbersome, have long testing cycles, and cannot simultaneously meet the testing needs of samples of different forms, resulting in low equipment utilization and extended research and development cycles.
A flame retardant performance testing device for materials was designed, including a housing, a first fixing component, and a second fixing component. It is compatible with cable sheathing samples and the cable under test. Through stable fixing and adaptive clamping, it can adapt to samples of different shapes and is equipped with a combustion generating component to provide a precise flame, thereby achieving rapid and effective flame retardant performance evaluation.
It shortens the material R&D cycle, improves testing efficiency and device utilization, provides immediate performance feedback, and provides data support for material formulation adjustment and optimization.
Smart Images
Figure CN223461539U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of material flame retardant performance testing, in particular to a material flame retardant performance testing device. BACKGROUND
[0002] Low-smoke halogen-free materials have been widely used in the fields of electric power and communication due to their excellent environmental protection performance and high safety. The flame retardant performance, as a core safety index of low-smoke halogen-free materials, determines the safety guarantee capability of low-smoke halogen-free materials in use.
[0003] Currently, the flame retardant performance testing of low-smoke halogen-free materials mainly relies on methods such as oxygen index determination, single vertical burning test, bundled burning test and smoke density test.
[0004] However, the existing testing methods have complicated operation processes and strict requirements on test conditions, resulting in a long evaluation period of the flame retardant performance of materials. CONTENT OF THE UTILITY MODEL
[0005] In view of the above problems, the embodiments of the present application provide a material flame retardant performance testing device, which can be compatible with different forms of samples such as cable sheath samples and cables to be tested, thereby shortening the research and development period of materials and improving the testing efficiency and device utilization.
[0006] In order to achieve the above purpose, the embodiments of the present application provide the following technical solutions:
[0007] The present application provides a material flame retardant performance testing device, which comprises a shell, two opposite side walls of the shell are respectively configured to form coaxially arranged mounting holes; a first fixing assembly is located in the shell and is arranged on the side wall of the shell, the first fixing assembly is configured to fix a cable sheath sample; a second fixing assembly, the second fixing assembly comprises two elastic clamping pieces, the two elastic clamping pieces are respectively arranged on the inner walls of the two mounting holes, and the elastic clamping pieces are configured to fix two ends of a cable to be tested; a combustion generating assembly is installed in the shell and is configured to burn the cable sheath sample or the cable to be tested.
[0008] In a possible implementation, the first fixing assembly comprises a plurality of fixing pieces, the plurality of fixing pieces are respectively fixed to the same side wall of the shell, and the plurality of fixing pieces are arranged at intervals along the height direction of the shell; the plurality of fixing pieces are respectively used for fixing the cable sheath sample.
[0009] In a possible implementation, the elastic clamping piece comprises: a plurality of springs, first ends of the plurality of springs are connected to the inner walls of the mounting holes, and the plurality of springs are arranged at intervals along the circumferential direction of the mounting holes, and the plurality of springs are elastically deformed along the radial direction of the mounting holes; an annular elastic piece connected to second ends of the plurality of springs; the annular elastic piece is configured to form a central passage so that the cable to be tested passes through.
[0010] In a possible implementation, the second fixing assembly further comprises a limiting mechanism, a receiving groove is arranged on the hole wall of the mounting through hole; when the mounting through hole is not threaded with the cable to be tested, the limiting mechanism is configured to limit the compression of the spring, so that the spring and the annular elastic member are accommodated in the receiving groove; when the mounting through hole is threaded with the cable to be tested, the limiting mechanism is configured to release the limitation on the spring, so that at least part of the spring and the annular elastic member extend out of the receiving groove, and the annular elastic member is tightly sleeved outside the cable to be tested.
[0011] In a possible implementation, the limiting mechanism comprises a driver and a limiting piece, the output end of the driver is connected with the limiting piece to drive the limiting piece to move relative to the spring.
[0012] In a possible implementation, the second fixing assembly further comprises a pressure sensor, the pressure sensing sheet of the pressure sensor is arranged at the bottom end of the hole wall of the mounting through hole; a controller, the controller is electrically connected with the pressure sensor and the driver respectively, and the controller is configured to control the driver to drive the limiting piece to move to release the limitation on the spring when the pressure sensor detects a pressure value.
[0013] In a possible implementation, the combustion generating assembly comprises a spray gun and a spray head, the spray gun is mounted on the bottom wall of the shell, and the spray head is rotationally connected to the top end of the spray gun; the combustion generating assembly further comprises a gas pipeline and an air pipeline, the gas pipeline and the air pipeline are respectively communicated with the spray gun.
[0014] In a possible implementation, the spray gun is configured to form a gas passage, an air passage and a mixing chamber, the gas passage is communicated with the gas pipeline, the air passage is communicated with the air pipeline, one end of the mixing chamber is respectively communicated with the gas passage and the air passage, and the other end of the mixing chamber is communicated with the spray head; the gas passage is provided with a gas regulating valve to adjust the gas flow.
[0015] In a possible implementation, the combustion generating assembly further comprises a movement module, the output end of the movement module is connected with the spray gun to drive the spray gun to move along the height direction of the shell and in the first plane, and the first plane is perpendicular to the height direction of the shell.
[0016] In a possible implementation, the top end of the shell is configured to form an exhaust hole for discharging gas in the shell to the outside of the shell.
[0017] The material flame-retardant performance testing device provided by the application comprises a shell, a first fixing assembly, a second fixing assembly and a combustion generating assembly. The shell can form a relatively closed test space, provide a stable environmental basis for material flame-retardant performance testing, and reduce the interference of external factors on the test. The first fixing assembly is located in the shell and arranged on the side wall of the shell, and can stably fix the sheath sample of the cable. The two opposite side walls of the shell are coaxially arranged and form mounting holes. The second fixing assembly comprises two elastic clamping pieces arranged on the inner walls of the two mounting holes, which can adaptively fix the two ends of the cable to be tested, can adapt to cables with different diameters, and can avoid the shaking of the cable during combustion by stable clamping, thereby further ensuring the stability of the test. The combustion generating assembly is installed in the shell and can provide the flame required for combustion to the sheath sample or the cable to be tested, thereby effectively evaluating the flame-retardant performance of different forms of test objects. The material flame-retardant performance testing device provided by the application can be compatible with different forms of samples such as the sheath sample of the cable, thereby shortening the research and development cycle of the material, improving the test efficiency and device utilization. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.
[0019] Figure 1 The structure schematic diagram of the material flame-retardant performance testing device provided by the embodiment of the application when the first fixing assembly is started;
[0020] Figure 2 The structure schematic diagram of the material flame-retardant performance testing device provided by the embodiment of the application when the second fixing assembly is started.
[0021] Explanation of reference signs:
[0022] 10 - testing device;
[0023] 100 - shell; 200 - first fixing assembly; 300 - second fixing assembly; 400 - combustion generating assembly; 500 - control module; 600 - gas regulating valve;
[0024] 110 - mounting hole; 120 - exhaust hole; 210 - first fixing piece; 220 - second fixing piece; 410 - spray gun; 420 - spray head; 430 - gas pipeline; 440 - air pipeline;
[0025] A - sheath sample; B - cable. DETAILED DESCRIPTION
[0026] As described in the background, low-smoke halogen-free materials have been widely used in the fields of power, communication, rail transportation, etc. due to their low smoke release and low toxicity during combustion. For example, in the field of cables, low-smoke halogen-free materials are often used to make cable sheaths, effectively improving the safety protection capability of cables in fire scenarios.
[0027] Among them, the flame retardant performance is the core index to measure the safety of low-smoke halogen-free materials, and is directly related to the smoke diffusion speed, flame spread degree and toxic gas release amount during a fire.
[0028] Currently, the flame retardant performance test of low-smoke halogen-free materials mainly uses traditional methods such as oxygen index method, single vertical burning method, bundled burning method and smoke density test. Among them, the oxygen index method evaluates the flame retardant property by measuring the minimum oxygen concentration required to maintain combustion in nitrogen-oxygen mixed gas. The single vertical burning method and the bundled burning method evaluate the burning behavior of the material under the action of the flame, such as self-extinguishing time, charring degree, etc. The smoke density test quantifies the amount of smoke generated during material combustion.
[0029] However, the above test methods have a complicated operation process, not only requiring complex experimental equipment, but also having strict requirements for the test environment, and the overall test period is long. At the same time, these methods are mostly single-function designed, which cannot meet the test needs of different forms of samples such as standard samples, finished cables and pipe materials at the same time, resulting in low equipment utilization. In addition, there is a lack of fast and simple flame retardant performance evaluation method in the early stage of material formula development, and researchers have difficulty in obtaining effective performance feedback in time, and have to rely on large-scale testing in the later stage, greatly prolonging the research and development cycle.
[0030] Therefore, the present application provides a material flame retardant performance test device.
[0031] Since different forms of samples such as sheath samples and finished cable samples need to be tested during the research and development process, the material flame retardant performance test device provided by the present application can be compatible through a double fixing method.
[0032] For the fixing needs of the sheath sample, the first fixing assembly is designed by the researchers of the present application and is arranged on the side wall of the shell. With the help of the stable fixing structure, the sheath sample can maintain the preset posture during the test, avoiding the influence of sample displacement on the observation accuracy of the burning state.
[0033] In view of the fixing requirement of the cable, the material flame-retardant performance testing device provided by the application is configured with coaxially arranged mounting through holes in the opposite two side walls of the shell to provide a channel for the cable to be tested to pass through. Considering that the diameters of the cables to be tested are different, the second fixing assembly is designed by the researchers of the application. The second fixing assembly includes an elastic clamping piece which can tightly clamp the cable by using the elastic property of the elastic clamping piece, thereby adapting to cables with different diameters.
[0034] In addition, the material flame-retardant performance testing device provided by the application further includes a combustion generating assembly installed in the shell, which can provide the flame required for combustion to the sheath sample or the cable, thereby effectively evaluating the flame-retardant performance of different forms of test objects.
[0035] In this way, the material flame-retardant performance testing device provided by the application can solve the problems of single function and long test period of the traditional test method, can timely feedback the flame-retardant performance of the material in the early stage of material research and development, and provide real-time data support for the formula adjustment and performance optimization of the material, thereby effectively shortening the research and development period of the material.
[0036] To make the objectives, technical solutions, and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described below in a clear and complete manner with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only some of the embodiments of the application but not all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the application.
[0037] Figure 1 FIG. 1 is a structural schematic diagram of the material flame-retardant performance testing device provided by the application when the first fixing assembly is enabled. Figure 2 FIG. 2 is a structural schematic diagram of the material flame-retardant performance testing device provided by the application when the second fixing assembly is enabled.
[0038] With reference to Figure 1 and Figure 2 , the application provides a material flame-retardant performance testing device (hereinafter referred to as a testing device).
[0039] The testing device 10 can be widely applied to the research and development and test scenes of low-smoke halogen-free materials and related products. Exemplarily, the testing device 10 can be used for flame-retardant performance testing of a sheath sample A in the early stage of material research and development, helping researchers to timely judge the feasibility of the basic formula and providing a basis for early material research and development adjustment.
[0040] The testing device 10 can also be used to test the combustion performance of the preliminarily formed cable B, pipe material and other products, and verify the performance stability of the material from the sample to the product. Meanwhile, the testing device 10 can also be used for comparative testing of samples, and the better scheme can be screened out by evaluating the flame retardant performance of different formula samples or different specifications of the cable B.
[0041] Referring to Figure 1 As shown in the drawings, the testing device 10 comprises a housing 100, which serves as the basic frame of the testing device 10 and can provide a stable mounting carrier for other components of the testing device 10. Meanwhile, the housing 100 can reduce the interference of the external environment on the flame retardant performance test through its relative sealing, and ensure the consistency of the test conditions.
[0042] The housing 100 can be made of high-temperature-resistant, corrosion-resistant and high-strength materials such as stainless steel. In this way, the housing 100 can not only withstand the high temperature generated in the flame retardant performance test, but also maintain structural stability in long-term use, avoiding deformation due to repeated heating. The shape of the housing 100 can be flexibly designed according to actual testing requirements. For example, the housing 100 can be designed in the shape of a cube, a cuboid or a cylinder, and the present application does not make specific limitations thereto.
[0043] Continuing to refer to Figure 1 The testing device 10 further comprises a first fixing assembly 200, which is located in the housing 100 and arranged on the side wall of the housing 100. The first fixing assembly 200 can be used to fix the sheath sample A of the cable.
[0044] The first fixing assembly 200 can comprise a plurality of fixing members, which are respectively fixed to the same side wall of the housing 100 and are spaced apart along the height direction of the housing 100. In this way, the plurality of fixing members can cooperatively fix different height positions of the sheath sample A, which can not only avoid the sagging and bending of the sheath sample A due to its own gravity, but also prevent the sheath sample A from tilting as a whole after local deformation caused by heating during the combustion process, further improving the stability of the sheath sample A in the test.
[0045] In some embodiments, the first fixing assembly 200 can include two fixing members, for ease of illustration, the two fixing members are defined as a first fixing member 210 and a second fixing member 220, the first fixing member 210 and the second fixing member 220 are arranged in a height direction of the shell 100 and can clamp and fix two ends of the sheath sample A of the cable. In this way, when the sheath sample A between the first fixing member 210 and the second fixing member 220 is subjected to the combustion test, it can be ensured that the sheath sample A always maintains a preset posture during the combustion test, so as to avoid displacement or shaking of the sheath sample A due to air flow impact or self-deformation during combustion, and thus to ensure that the test conditions such as the position and angle of the flame acting on the sample are stable, and to provide an accurate test benchmark for observing the combustion speed, self-extinguishing state, carbonization range and other flame retardant performance characteristics of the sheath sample A.
[0046] Exemplarily, the first fixing member 210 and the second fixing member 220 can be a clamping sheet structure (not shown in the figure). Specifically, the clamping sheet structure can be composed of two high-temperature-resistant alloy clamping sheets and a high-temperature-resistant bolt. The two clamping sheets are arranged in parallel and opposite to each other, and the bolt is arranged in the end through hole of the two clamping sheets. By tightening or loosening the bolt, the gap between the two clamping sheets can be adjusted. When the gap between the two clamping sheets is reduced to fit the surface of the sheath sample A, stable clamping of the sheath sample A can be formed, and the sheath sample A of different sizes can be adapted to ensure reliable fixation of the two ends of the sheath sample A during the combustion test.
[0047] The embodiments of the present application do not limit the specific structure of the first fixing member 210 and the second fixing member 220, as long as stable fixation of the sheath sample A can be achieved.
[0048] In addition, the test device 10 can also test the flame retardant performance of the cable B. Referring to Figure 1 and Figure 2 , the two opposite side walls of the shell 100 are respectively configured to form coaxially arranged mounting through holes 110, and the mounting through holes 110 can provide a passage for the cable B to be tested to pass through.
[0049] Referring to Figure 2 , the test device 10 includes a second fixing assembly 300. The second fixing assembly 300 includes two elastic clamping members (not shown in the figure), which are arranged on the inner walls of the two mounting through holes 110 and are used to fix the two ends of the cable B to be tested.
[0050] The inner side of the two elastic clamping members can form an arc-shaped contact surface matched with the outer surface of the cable B. When the cable B passes through the mounting through hole 110, the elastic clamping members can be self-adapted to the tubular cable B with different diameters through elastic deformation, effectively limiting the axial sliding or radial shaking of the cable B in the combustion test, and ensuring that the cable B is in a preset test position, thereby providing stable test conditions for observing the combustion spread speed and sheath flame-retardant effect of the cable B.
[0051] In some embodiments, the elastic clamping member can include a plurality of springs and an annular elastic member. The first end of the plurality of springs is connected to the inner wall of the mounting through hole 110, and the plurality of springs are arranged in a circumferential direction of the mounting through hole 110, and the plurality of springs can be elastically deformed in the radial direction of the mounting through hole 110, thereby forming a self-adaptive adjusting structure.
[0052] The annular elastic member is connected to the second end of the plurality of springs, and the annular elastic member is configured to form a central passage for the cable B to pass through. The outer diameter of the annular elastic member can be dynamically adjusted according to the elastic deformation of the spring, so that the elastic clamping member can automatically adapt to the cable B with different diameters to be tested. When the two ends of the cable B pass into the central passage, the annular elastic member will tightly wrap the outer wall of the cable B under the action of the elastic force, thereby effectively limiting the axial sliding or radial shaking of the cable B in the combustion test.
[0053] The annular elastic member needs to consider the elastic adaptability, high temperature resistance and stable adhesion to the surface of the cable B. For example, the annular elastic member can be made of high-temperature-resistant silicone rubber. The high-temperature-resistant silicone rubber has good elastic deformation ability and can flexibly stretch and contract with the spring to adapt to cables B with different diameters. At the same time, the high-temperature-resistant silicone rubber has excellent high-temperature resistance and aging resistance, can maintain stable elastic deformation ability in long-term tests, continuously provide reliable clamping force, and ensure the position stability of the cable B during the test process.
[0054] Alternatively, the annular elastic member can also be made of fluororubber. The fluororubber has excellent high-temperature resistance and strong chemical corrosion resistance, can adapt to a small amount of combustion residues that may be generated during the test, and can maintain stable elasticity and clamping force. The material of the annular elastic member is not limited in the embodiments of the present application.
[0055] In order to realize the storage and extension control of the elastic clamping member, the second fixing assembly 300 can include a limiting mechanism (not shown in the figure). The hole wall of the mounting through hole 110 is provided with a receiving groove (not shown in the figure) for accommodating the spring and the annular elastic member. The shape of the receiving groove is matched with the overall appearance shape of the spring and the annular elastic member, and a too large receiving groove does not need to be provided to affect the structural strength.
[0056] When the installation through hole 110 is not provided with the cable B to be tested, the limiting mechanism limits the compression of the spring, so that the spring and the annular elastic member are accommodated in the accommodation groove. In this way, the damage caused by the long-term exposure of the elastic clamping member can be avoided, and the installation through hole 110 can be kept relatively unobstructed, so that the subsequent cable B is less hindered.
[0057] When the installation through hole 110 is provided with the cable B to be tested, the limiting mechanism releases the limitation on the spring, and the spring stretches to the center of the installation through hole 110 under the action of its own elastic force, drives at least part of the spring and the annular elastic member to stretch out of the accommodation groove, and makes the annular elastic member tightly fit on the outside of the cable B to be tested, thereby realizing the stable clamping of the cable B to be tested.
[0058] The limiting mechanism can include a driver and a limiting piece, the output end of the driver is connected with the limiting piece to form a stable transmission relationship, so that the limiting piece moves along a preset track relative to the spring. The output end of the driver can be directly connected with the limiting piece, or the output end of the driver can be connected with the limiting piece through a connecting rod, and the present application embodiment does not make specific limitation on this.
[0059] For example, the limiting piece can be designed as a spring-shaped baffle or buckle structure, when the installation through hole 110 is not provided with the cable B, the driver drives the limiting piece to move to a corresponding position, for example, the baffle or buckle of the limiting piece abuts against one side of the spring close to the opening of the accommodation groove, and limits the spring from stretching to the center of the through hole by physical blocking, so that the spring remains in a compressed state and is accommodated in the accommodation groove together with the annular elastic member.
[0060] When the cable B is inserted into the installation through hole 110 and triggers a start signal, the driver drives the limiting piece to move away from the spring after receiving the signal, and the baffle or buckle of the limiting piece is separated from the blocking of the spring, so that the spring drives the annular elastic member to stretch out of the accommodation groove under the action of its own elastic force, thereby realizing the accurate switching of the limiting state of the spring.
[0061] After the test is completed, the operator takes out the cable B from the installation through hole 110, and then presses the annular elastic member to make the annular elastic member drive the spring to retract into the accommodation groove. After receiving a reset signal, the driver drives the limiting piece to move close to the spring, until the baffle or buckle abuts against one side of the spring close to the opening of the accommodation groove. At this time, the spring cannot stretch to the center of the installation through hole 110 under the blocking of the limiting piece, and returns to the accommodation state, waiting for the next test.
[0062] In some possible embodiments, the driver can be connected with a start button and a reset button. When the cable B is inserted into the mounting hole 110, the operator presses the start button, and the start button generates an electrical signal which is transmitted to the driver. After receiving the signal, the driver drives the limiting part to move along the preset trajectory away from the spring, so that the limiting part is separated from the abutment of the spring. Thus, the limiting effect of the limiting part on the spring is released, and at least part of the spring and the annular elastic member extend out of the containing groove, and the annular elastic member is tightly sleeved on the outside of the cable B to be tested, so that the stable clamping of the cable B to be tested is realized.
[0063] When the cable B is taken out of the mounting hole 110, the operator presses the annular elastic member to make the annular elastic member drive the spring to retract into the containing groove, and then presses the reset button. The reset button generates an electrical signal which is transmitted to the driver. After receiving the signal, the driver drives the limiting part to move along the preset trajectory towards the spring, until the limiting part abuts against the side of the spring close to the opening of the containing groove, and the limiting effect of the limiting part on the spring is restored.
[0064] In some possible embodiments, the second fixing assembly 300 can include a pressure sensor (not shown in the figure) and a controller (not shown in the figure). The pressure sensing sheet of the pressure sensor is arranged at the bottom end of the hole wall of the mounting hole 110. In this way, when the cable B to be tested is inserted into the mounting hole 110, the pressure sensing sheet can first contact the cable B and perceive the pressure, so as to ensure the timeliness of the trigger signal. The controller is electrically connected with the pressure sensor and the driver respectively. After receiving the signal transmitted by the pressure sensor, the controller can send an action instruction to the driver.
[0065] Specifically, when the cable B to be tested is inserted into the mounting hole 110, the cable B will naturally fall and abut against the hole wall of the mounting hole 110 under the action of its own gravity, and then contact the pressure sensing sheet at the bottom end of the hole wall. At this time, the pressure sensing sheet converts the received pressure signal into an electrical signal and transmits the electrical signal to the controller. After receiving the electrical signal, the controller immediately sends an action instruction to the driver. After receiving the instruction, the driver drives the limiting part to move, so as to release the limitation on the spring, and thus the spring can drive the annular elastic member to extend out of the containing groove under the action of its own elastic force, and the clamping and fixing of the cable B are completed.
[0066] Continuing to refer to Figure 1 and Figure 2 , the test device 10 further includes a combustion generating assembly 400 arranged in the housing 100, which is used for combusting the jacket sample A of the fixed cable or the cable B to be tested.
[0067] The combustion generating assembly 400 comprises a lance 410 and a nozzle 420. The lance 410 is mounted on the bottom wall of the housing 100, and the nozzle 420 is rotatably connected to the top end of the lance 410, so that the injection angle of the flame can be flexibly adjusted to ensure that the flame can accurately act on the target test area of the sheath sample A or the cable B.
[0068] To provide a stable combustion source, the combustion generating assembly 400 further comprises a gas pipe 430 and an air pipe 440, which are respectively communicated with the lance 410 to deliver gas and air. The internal structure of the lance 410 forms a gas passage (not shown in the figure), an air passage (not shown in the figure), and a mixing chamber (not shown in the figure) for mixing gas. Among them, the gas passage is communicated with the gas pipe 430, the air passage is communicated with the air pipe 440, and one end of the mixing chamber is respectively communicated with the gas passage and the air passage, and the other end of the mixing chamber is communicated with the nozzle 420. In this way, the gas and air are fully mixed in the mixing chamber, and then sprayed out through the nozzle 420 and ignited to form a stable flame.
[0069] The combustion generating assembly 400 can further comprise a moving module (not shown in the figure), the output end of which is connected with the lance 410 to drive the lance 410 to ascend and descend along the height direction of the housing 100 and to translate in a first plane perpendicular to the height direction. In this way, through the moving function of the moving module, the spatial distance and macro position of the lance 410 from the sheath sample A to be tested or the cable to be tested can be adjusted.
[0070] In some possible embodiments, the moving module can comprise a vertical lifting mechanism and a horizontal translation mechanism. Among them, the horizontal translation mechanism is arranged on the bottom wall of the housing 100, the vertical lifting mechanism is connected with the horizontal translation mechanism, and the output end of the vertical lifting mechanism is connected with the bottom end of the lance 410. Alternatively, the vertical lifting mechanism is arranged on the bottom wall of the housing 100, the horizontal translation mechanism is connected with the vertical lifting mechanism, and the output end of the horizontal translation mechanism is connected with the bottom end of the lance 410.
[0071] The vertical lifting mechanism and the horizontal translation mechanism can comprise a motor and a transmission mechanism, which includes but is not limited to a gear and rack, a screw nut, a belt transmission assembly, a chain transmission assembly, etc. Alternatively, the vertical lifting mechanism and the horizontal translation mechanism can also be driven by an electric push rod, an air cylinder or a hydraulic cylinder. The specific structure of the vertical lifting mechanism and the horizontal translation mechanism is not limited in the embodiments of the present application.
[0072] In addition, when the combustion generating assembly 400 performs the combustion test on the sheath sample A or the cable B, the flame combustion will generate smoke, which will not only block the line of sight of observation if accumulated in the housing 100 for a long time, but also may form a safety hazard due to too high gas concentration. Therefore, the top end of the housing 100 is further structured to form an exhaust hole 120 (seeFigure 1 and Figure 2 The exhaust hole 120 can be directly communicated with the outside atmosphere. Alternatively, the exhaust hole 120 can also extend to the outside of the shell 100 through an exhaust pipe. The exhaust hole 120 can quickly exhaust the flue gas, unburned gas residue and hot air generated in the shell 100 during the combustion test, so as to ensure the visibility of the test environment in the shell 100, and at the same time maintain the balance of the air pressure in the shell 100 and the outside, avoiding interference with the combustion stability due to the local air pressure being too high.
[0073] Continuing to refer to Figure 1 and Figure 2 The test device 10 further comprises a control module 500, a flow sensor (not shown in the figure) and a gas regulating valve 600. The control module 500 can dynamically adjust the flame size and temperature by controlling the mixing ratio and delivery flow rate of air and gas, so as to adapt to the flame-retardant performance test requirements of different test samples.
[0074] The flow sensor is respectively installed on the gas pipeline 430 and the air pipeline 440, and can monitor the instantaneous flow rate of the gas in the gas pipeline 430 and the instantaneous flow rate of the air in the air pipeline 440 in real time, and feed back the monitored flow rate data to the control module 500. The control module 500 is built-in with parameter configurations corresponding to different test samples. During the test, the control module 500 can drive the opening degree of the gas regulating valve 600 to change according to the type of the test sample, flexibly adjust the delivery ratio and total flow rate of the gas and air, and then control the flame size and combustion intensity, so as to adapt to the test requirements of different flame-retardant grade sheath samples A or cables B.
[0075] It should be noted that the terms "one embodiment", "an embodiment", "exemplary embodiment", "some embodiments", etc. in the specification mean that the described embodiment can include a particular feature, structure or characteristic, but not necessarily every embodiment. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when a particular feature, structure or characteristic is described in connection with an embodiment, it is within the knowledge of those skilled in the art to realize such feature, structure or characteristic in connection with other embodiments described explicitly or implicitly.
[0076] Generally, the terms should be understood at least partly by the use in the context. For example, at least partly according to the context, the term "one or more" used in the text can be used to describe any feature, structure or characteristic of singular meaning, or can be used to describe a combination of features, structures or characteristics of plural meaning. Similarly, at least partly according to the context, terms such as "a" or "said" can be understood as conveying singular usage or conveying plural usage.
[0077] It should be readily understood that "on," "over," and "above" in the present application are to be interpreted in the broadest context, such that "on" means not only "directly on" but also includes the meaning of "on" with intervening features or layers therebetween, and "over" or "above" includes not only the meaning of "over" or "above" but also the meaning of "over" or "above" with no intervening features or layers therebetween (i.e., directly on).
[0078] In addition, spatially relative terms, such as "beneath", "below", "lower", "above", "upper", and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. The devices can be otherwise oriented (rotated 90° or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
[0079] Finally, it should be noted that the above-described embodiments are merely intended for describing and illustrating, not limiting, the technical solutions of the present application; even though the present application has been described in detail with reference to the above-described embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the above-described embodiments, or equivalently replace some or all of the technical features thereof; and such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A device for testing the fire retardant properties of a material, characterised in that, The application relates to a cable combustion test device. The device comprises: a housing, two opposite side walls of which are respectively configured to form coaxially arranged mounting holes; a first fixing assembly arranged in the housing and arranged on the side wall of the housing, the first fixing assembly being configured to fix a cable sheath sample; a second fixing assembly, the second fixing assembly comprising two elastic clamping members arranged on the inner walls of the two mounting holes respectively, the elastic clamping members being configured to fix two ends of a cable to be tested; 2. The apparatus for testing the flame retardant properties of a material of claim 1, wherein, a combustion generating assembly arranged in the housing and configured to combust the cable sheath sample or the cable to be tested.
3. The apparatus for testing the fire-retardant properties of a material of claim 1, wherein, The first fixing assembly comprises a plurality of fixing members fixed to the same side wall of the housing and arranged at intervals along the height direction of the housing, and the fixing members are respectively used for fixing the cable sheath sample. The elastic clamping member comprises: a plurality of springs, first ends of the springs being connected to the inner walls of the mounting holes and the springs being arranged at intervals along the circumferential direction of the mounting holes and being elastically deformed along the radial direction of the mounting holes; 4. The apparatus for testing the fire retardant properties of a material of claim 3, wherein, a ring-shaped elastic member connected to the second ends of the springs, the ring-shaped elastic member being configured to form a central passage for the cable to be tested to pass through. The second fixing assembly further comprises a limiting mechanism; the hole wall of the mounting hole is provided with a receiving groove; when the cable to be tested is not arranged in the mounting hole, the limiting mechanism is configured to limit the compression of the springs so that the springs and the ring-shaped elastic member are accommodated in the receiving groove; 5. The apparatus for testing the fire retardant properties of a material of claim 4, wherein, when the cable to be tested is arranged in the mounting hole, the limiting mechanism is configured to release the limitation on the springs so that at least part of the springs and the ring-shaped elastic member extend out of the receiving groove and the ring-shaped elastic member is tightly sleeved on the outside of the cable to be tested.
6. The apparatus for testing the fire retardant properties of a material of claim 5, wherein, The limiting mechanism comprises a driver and a limiting member, the output end of the driver being connected with the limiting member to drive the limiting member to move relative to the springs. The second fixing assembly further comprises: a pressure sensor, a pressure sensing sheet of the pressure sensor being arranged at the bottom end of the hole wall of the mounting hole; 7. The apparatus for testing the flame retardant properties of a material according to any one of claims 1 to 6, wherein, a controller, the controller being electrically connected with the pressure sensor and the driver, and the controller being configured to control the driver to drive the limiting member to move to release the limitation on the springs when the pressure sensor detects a pressure value. The combustion generating assembly comprises a spray gun and a spray head, the spray gun being arranged on the bottom wall of the housing, and the spray head being rotationally connected to the top end of the spray gun; 8. The apparatus for testing the fire retardant properties of a material of claim 7, wherein, the combustion generating assembly further comprises a gas pipeline and an air pipeline, the gas pipeline and the air pipeline being respectively communicated with the spray gun. The spray gun is configured to form a gas passage, an air passage and a mixing chamber, the gas passage being communicated with the gas pipeline, the air passage being communicated with the air pipeline, one end of the mixing chamber being respectively communicated with the gas passage and the air passage, and the other end of the mixing chamber being communicated with the spray head; the gas passage is provided with a gas regulating valve to regulate the gas flow.
9. The apparatus for testing the fire retardant properties of a material of claim 7, wherein, The combustion generating assembly further comprises a moving module, an output end of the moving module being connected with the spray gun to drive the spray gun to move along a height direction of the shell and in a first plane, the first plane being perpendicular to the height direction of the shell.
10. The apparatus for testing the flame retardant properties of a material according to any one of claims 1-6, wherein, A top end of the shell is configured to form an exhaust hole, the exhaust hole being used to exhaust gas in the shell to outside of the shell.