A building material non-combustibility testing furnace and its testing method

Abstract

This application relates to a building material non-combustibility testing furnace and its testing method, belonging to the field of building material testing equipment. It includes a housing, a furnace body located above and fixed to the housing, a frame mounted above the furnace body, and a sample cage mounted on the frame. The sample cage is fixed to the frame by nuts. The furnace body contains an annular scraper that contacts the inner wall of the furnace body. The housing contains a connecting assembly supporting the furnace body, which includes several connecting rods fixed to the sample cage and to the scraper. Several supporting springs are connected to the lower surface of the scraper, and the lower ends of the supporting springs are fixed to the housing. This application has the effect of reducing adverse effects on non-combustibility testing.

Description

Technical Field

[0001] This application relates to the field of equipment for testing building materials, and in particular to a building material non-combustibility testing furnace and its testing method. Background Technology

[0002] The non-combustible building material testing furnace is suitable for testing methods that evaluate combustion performance under specified conditions. A common testing furnace includes a box for collecting furnace ash, a furnace body fixedly connected to the top of the box, a frame fixedly connected to the top of the furnace body, and a sample cage for holding the test samples slidably connected to the frame. A conduit extending into the box is fixedly connected to the bottom of the furnace body. During the test, the operator opens the furnace body and places multiple samples into the sample cage. When the temperature inside the furnace body is constant, the sample cage is placed into the furnace body and fixed to the frame. The furnace body heats and burns the samples. The ash produced by the combustion of the samples falls into the box through the conduit for collection. After the test, the carbonized materials, ash, and other residues produced by the combustion of the samples need to be collected and weighed, and a test report is generated through calculation.

[0003] Because some of the ash produced by the combustion of the sample adheres to the inner wall of the furnace body when it falls, it is inconvenient for the operator to collect other substances formed by the combustion of the sample. As a result, the operator cannot collect all the substances produced by the combustion of the sample, which leads to a large error between the recorded data and the actual data, and has an adverse effect on the non-combustibility test. Summary of the Invention

[0004] In order to reduce the adverse effects on the non-combustibility test, this application provides a building material non-combustibility test furnace and the test method thereof.

[0005] Firstly, this application provides a building material non-combustibility testing furnace, which adopts the following technical solution:

[0006] A building material non-combustibility testing furnace includes a box, a furnace body located above the box and fixed to the box, a frame set above the furnace body, and a sample cage installed on the frame. The sample cage is fixed to the frame by nuts. The furnace body is provided with an annular scraper, which contacts the inner wall of the furnace body.

[0007] The box is equipped with a connecting assembly that supports the furnace body. The connecting assembly includes several connecting rods fixed on the sample cage, and the connecting rods are fixed to the scraper.

[0008] The lower surface of the scraper is connected to several support springs, and the lower ends of the support springs are fixed to the box body.

[0009] By adopting the above technical solution, in the initial state, the support spring supports the scraper, so that the scraper is located at the top of the furnace body, and the sample cage is located outside the furnace body. When it is necessary to put the sample cage into the furnace body, the nut that fixes the sample cage is rotated, and the sample cage, connecting rod and scraper are pressed to move downward. While the scraper moves downward, it also compresses the support spring.

[0010] When the sample cage is moved to the expected position, the nut is turned to fix the sample cage. At this time, the positions of the connecting rod and the scraper are also fixed. The scraper is located at the bottom of the furnace body, and the support spring is in a compressed state. After the test, the nut is turned to release the sample cage from the frame. At this time, the support spring returns to its original deformation and pushes the scraper, connecting rod and sample cage upward. While the scraper moves upward, it scrapes the furnace ash on the inner side wall of the furnace body. The scraped furnace ash falls into the box. When the support spring returns to its initial state, the scraper is located at the top of the furnace body and the sample cage is located outside the furnace body.

[0011] The scraper removes the ash adhering to the inner wall of the furnace body, and the scraped ash falls into the box, making it convenient for operators to collect the products after the sample is burned, thereby reducing the adverse effects on the non-combustibility test. As the scraper moves upward, it can also push the sample cage out of the furnace body, reducing the need for operators to manually remove the sample cage from the furnace body, making it more convenient for operators to conduct the non-combustibility test.

[0012] Optionally, the scraper is inclined, with its outer side gradually tilting downwards towards the inner side.

[0013] By adopting the above technical solution, when the furnace ash falls onto the scraper, it can slide down the inclined scraper into the box.

[0014] Optionally, the connecting assembly further includes a fixing rod fixedly connected to the lower surface of the scraper, and a plug rod that penetrates the scraper and is slidably inserted into the scraper, with the lower end of the fixing rod fixed to the upper end of the support spring.

[0015] By adopting the above technical solution, the connecting rod guides the scraper when it moves, reducing the possibility of the scraper getting stuck with the furnace body and allowing the furnace body to move more smoothly.

[0016] Optionally, there is one fixed rod and one plug-in rod. A tension spring is fixedly connected to the upper surface of the scraper. The upper end of the tension spring is fixed to the inner top wall of the furnace body. The box is equipped with several striking components that cause the scraper to vibrate and thus strike the furnace body.

[0017] By adopting the above technical solution, when the scraper moves, the scraper drives the fixed rod to move downward, and at the same time the striking component works. When the scraper moves upward, the striking component works to make the scraper vibrate. The scraper transmits force to the furnace body, thereby shaking the furnace ash on the inner side wall of the furnace body off, thus improving the effect of collecting furnace ash.

[0018] Optionally, the striking assembly includes a striking plate hinged to a fixed rod, the hinge axis of the striking plate being located on the upper side of the striking plate;

[0019] A drive rod is hinged to the lower side of the striking plate. The end of the drive rod away from the striking plate is hinged to the plug rod, and the end of the drive rod near the striking plate is lower than the end of the drive rod near the plug rod.

[0020] A limiting member is provided between the striking plate and the plug rod to press the striking plate against the fixed rod. The limiting member is an elastic member. The fixed end of the limiting member is fixed to the plug rod, and the telescopic end of the limiting rod is fixed to the striking plate.

[0021] By adopting the above technical solution, when the scraper moves downward, the scraper drives the fixed rod to move downward, thereby compressing the support spring and stretching the tension spring. The movement of the fixed rod drives the striking plate to move downward, the drive rod rotates and pulls the lower side of the striking plate to rotate away from the fixed rod. At the same time, the limiting component also deforms with the rotation of the striking plate. During the test, the position of the scraper is fixed and the position of the striking plate remains unchanged.

[0022] After the test is completed, the nut that fixes the sample cage is rotated. The support spring and tension spring both return to their original deformation and push the fixing rod, scraper and sample cage upward. At the same time, the limiting part returns to its original deformation and drives the striking plate to move. The drive rod rotates and makes the striking plate rotate closer to the fixing rod. When the scraper returns to its initial position, the striking plate strikes the fixing rod. The fixing rod transmits the force to the scraper and the furnace body, thereby causing the furnace body to vibrate.

[0023] Optionally, a sleeve is fixedly connected to the striking plate, a support rod is slidably inserted into the sleeve, one end of the support rod is hinged to the insertion rod, and a limit spring is fixedly connected to the inner bottom wall of the sleeve, the limit spring being fixed to the support rod.

[0024] By adopting the above technical solution, when the striking plate moves, the striking plate drives the sleeve to move, and the movement of the sleeve causes the limiting spring to deform; when the fixed rod moves upward, the limiting spring restores its deformation and drives the sleeve and the striking plate to move.

[0025] Optionally, the scraper is an arc-shaped plate that fits into the fixing rod.

[0026] By adopting the above technical solution, the contact area between the scraper and the fixed rod is increased, making the fixed rod more evenly stressed.

[0027] Optionally, the tension spring is sleeved on the plug rod.

[0028] By adopting the above technical solution, the plug rod can guide the tension spring and reduce the occurrence of tension spring bending.

[0029] Secondly, this application provides a method for testing the non-combustibility of building materials, employing the following technical solution:

[0030] S1. Take five samples;

[0031] S2. Dry the sample and then cool it to room temperature;

[0032] S3. Start the furnace body and maintain the temperature inside the furnace body at the predetermined temperature;

[0033] S4. Place the sample in the sample cage, push the sample cage into the furnace body, fix the sample cage, keep it for 30 minutes, observe the combustion behavior of the sample during the test and record it.

[0034] S5. Rotate the nut to restore the deformation of the support spring and push the scraper and sample cage upward. The scraper scrapes the furnace ash on the inner wall of the furnace body into the box.

[0035] S6. Collect the sample and the products after the sample combustion, weigh and record them;

[0036] S7. Measure and record the mass loss, and generate a test report after calculation.

[0037] In summary, this application includes at least one of the following beneficial technical effects:

[0038] 1. By setting up a box, furnace body, scraper, support spring and connecting rod, it is convenient for operators to collect the products after the sample is burned, reducing the adverse effects on the non-flammability test;

[0039] 2. By setting fixed rods and plug-in rods, the jamming between the scraper and the furnace body is reduced, allowing the furnace body to move more smoothly;

[0040] 3. By setting a striking plate, limiting components, and a drive rod, the ash on the inner side wall of the furnace body can be shaken off, improving the ash collection efficiency. Attached Figure Description

[0041] Figure 1 This is a cross-sectional view illustrating the overall structure of the experimental furnace in an embodiment of this application.

[0042] Figure 2 This is a schematic diagram illustrating the overall structure of the frame in an embodiment of this application.

[0043] Figure 3This is a cross-sectional view illustrating the structure of the connecting component in an embodiment of this application.

[0044] Figure 4 This is a cross-sectional view illustrating the overall structure of the striking component in an embodiment of this application.

[0045] Explanation of reference numerals in the attached drawings: 1. Box body; 11. Column; 12. Lower platform; 13. Upper platform; 2. Furnace body; 3. Guide tube; 4. Frame; 41. Positioning rod; 42. Horizontal bar; 43. Vertical bar; 44. Nut; 5. Sample cage; 51. Collar; 6. Scraper; 61. Connecting rod; 7. Connecting assembly; 71. Fixing rod; 72. Insertion rod; 73. Support spring; 74. Tension spring; 8. Striking assembly; 81. Striking plate; 82. Drive rod; 83. Limiting component; 831. Sleeve; 832. Support rod; 833. Limiting spring. Detailed Implementation

[0046] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0047] This application discloses a building material non-combustibility testing furnace. (Refer to...) Figure 1 The test furnace includes a box body 1, the top of which is open. Columns 11 are vertically fixed to the four corners of the upper surface of the box body 1. A lower platform 12 is fixedly connected to the upper end of all the columns 11. The furnace body 2 is installed on the platform. The upper and lower ends of the furnace body 2 are provided with openings, and the diameter of the opening at the upper end of the furnace body 2 is smaller than the inner diameter of the furnace body 2.

[0048] A conduit 3 is fixedly connected to the lower surface of the furnace body 2. The conduit 3 communicates with the furnace body 2, and its lower end extends into the box 1. An upper platform 13 is fitted on the furnace body 2. The upper platform 13 is located on the upper part of the furnace body 2 and is fixedly connected to the furnace body 2. A frame 4 is provided on the upper platform 13, and a sample cage 5 is installed on the frame 4. The outer diameter of the sample cage 5 is smaller than the top opening of the furnace body 2.

[0049] Reference Figure 2 The frame 4 includes two positioning rods 41 vertically fixedly connected to the upper platform 13. The positioning rods 41 are threaded rods, and the opening at the upper end of the furnace body 2 is located between the two positioning rods 41. The frame 4 also includes a collar 51 fitted on each positioning rod 41. Each collar 51 is fixedly connected to a crossbar 42, which is placed horizontally and located between the two positioning rods 41.

[0050] A vertical rod 43 is fixedly connected to one end of each of the two horizontal bars 42 that are close to each other. The length of the vertical rod 43 is set along the length of the positioning rod 41. The lower end of the vertical rod 43 is located below the horizontal bar 42. The sample cage 5 is located below the two vertical rods 43. The lower end of each vertical rod 43 is fixed to the upper surface of the sample cage 5. Two nuts 44 are also threaded onto each positioning rod 41. A collar 51 is located between the two nuts 44. The two nuts 44 cooperate with the positioning rod 41 to fix the position of the horizontal bar 42 and the sample cage 5.

[0051] Reference Figure 1 and Figure 3 The furnace body 2 is provided with a scraper 6 in the shape of a conical scraper 6. The end of the scraper 6 with a larger diameter faces upward and the end with a smaller diameter faces downward. The minimum inner diameter of the scraper 6 is greater than the outer diameter of the sample cage 5 and less than the diameter of the bottom opening of the furnace body 2. The scraper 6 is coaxial with the furnace body 2 and contacts the inner side wall of the furnace body 2. Two connecting rods 61 are fixedly connected to the upper surface of the scraper 6. The upper end of the connecting rods 61 is fixed to the lower surface of the sample cage 5.

[0052] Reference Figure 1 and Figure 3 The housing 1 is also provided with a connecting assembly 7 for supporting the scraper 6. The connecting assembly 7 includes a fixing rod 71 and a plug rod 72 passing through the guide tube 3. Both the fixing rod 71 and the plug rod 72 are perpendicular to the lower surface of the housing 1. The bottom opening of the scraper 6 is located between the fixing rod 71 and the plug rod 72.

[0053] The upper end of the fixing rod 71 is fixedly connected to the lower surface of the scraper 6. The insertion rod 72 passes through the scraper 6 and is slidably inserted into the scraper 6. The upper end of the insertion rod 72 is fixed to the inner top wall of the furnace body 2. A support spring 73 is fixedly connected to the lower end of the insertion rod 72. The lower ends of both the support spring 73 and the insertion rod 72 are fixed to the inner bottom wall of the box body 1. A tension spring 74 is also sleeved on the insertion rod 72. The tension spring 74 is located above the scraper 6. The upper end of the tension spring 74 is fixed to the inner top wall of the furnace body 2, and the lower end of the tension spring 74 is fixed to the upper surface of the scraper 6.

[0054] In the initial state, the sample cage 5 is located outside the furnace body 2. The support spring 73 and the tension spring 74 cooperate to limit the scraper 6, so that the scraper 6 is located at the top of the furnace body 2. When it is necessary to conduct a non-combustible building material test, take five samples and put them into the sample cage 5. Then turn on the furnace body 2 to keep the temperature inside the furnace body 2 constant. Then rotate the bottom nut 44. When the height of the nut 44 reaches the corresponding position, press down the crossbar 42 to move the sample cage 5 down and into the furnace body 2.

[0055] As the sample cage 5 moves downward, the sample cage 5 drives the connecting rod 61, scraper 6, and fixing rod 71 to move downward. At the same time as the scraper 6 and fixing rod 71 move downward, the insertion rod 72 guides the scraper 6 to reduce the possibility of jamming when the scraper 6 moves. The scraper 6 stretches the tension spring 74, and the fixing rod 71 compresses the support spring 73.

[0056] When the collar 51 contacts the bottom nut 44, rotate the top nut 44 until it contacts the collar 51. At this time, the two nuts 44 cooperate to fix the collar 51, thereby fixing the position of the sample cage 5. Since the position of the sample cage 5 is fixed, the position of the scraper 6 is also fixed. At this time, the scraper 6 is located at the bottom of the furnace body 2, and the support spring 73 and tension spring 74 both remain deformed.

[0057] When it is necessary to remove the sample, rotate the topmost nut 44 to move it upward; at the same time, the support spring 73 and the tension spring 74 both return to their original deformation. The support spring 73 returns to its original deformation and pushes the fixing rod 71 and the scraper 6 upward, while the tension spring 74 returns to its original deformation and pulls the scraper 6 upward, thereby scraping off the furnace ash attached to the inner wall of the furnace body 2.

[0058] The scraped-off furnace ash falls along the inclined scraper 6. Since the inner diameter of the lower side of the scraper 6 is smaller than the diameter of the bottom opening of the furnace body 2, the amount of furnace ash falling onto the inner bottom wall of the furnace body 2 is reduced. The falling furnace ash falls along the guide pipe 3 to the bottom of the box 1 for collection. This makes it convenient for operators to collect the furnace ash, thereby reducing the adverse effects on the non-combustibility test.

[0059] The scraper 6 moves and pushes the connecting rod 61, sample cage 5, vertical rod 43, horizontal rod 42 and collar 51 upward until the support spring 73 and tension spring 74 return to their initial state. At this time, the sample cage 5 returns to its initial position, thus achieving the purpose of automatically removing the sample cage 5, making it easier for the operator to remove the sample cage 5.

[0060] Reference Figure 1 and Figure 4 In order to better remove the ash from the inner wall of the furnace body 2, the box 1 is also equipped with several striking components 8. The operation of the striking components 8 causes the scraper 6 to vibrate, thereby shaking off the ash from the inner wall of the furnace body 2. The striking components 8 are located between the plug rod 72 and the fixed rod 71, and the striking components 8 are located below the guide tube 3. When there are multiple striking components 8, the multiple striking components 8 are distributed along the height direction of the plug rod 72. In this embodiment, there are two striking components 8.

[0061] The striking assembly 8 includes a striking plate 81 hinged to the side wall of the fixed rod 71. The striking plate 81 is an arc-shaped plate that fits against the side wall of the fixed rod 71. The length direction of the striking plate 81 is arranged along the axial direction of the fixed rod 71. The hinge axis between the striking plate 81 and the fixed rod 71 is located on the upper side of the striking plate 81. A driving rod 82 is hinged to the side wall of the striking plate 81 away from the fixed rod 71. The driving rod 82 is located on the lower side of the striking plate 81. The end of the driving rod 82 away from the striking plate 81 is hinged to the insertion rod 72.

[0062] The striking assembly 8 also includes a limiting member 83 disposed on the insertion rod 72. In the initial state, the limiting member 83 causes the striking plate 81 to abut against the fixed rod 71. The limiting member 83 includes a sleeve 831 fixedly connected to the side wall of the striking plate 81. The sleeve 831 is close to the hinge axis of the striking plate 81, and the opening of the sleeve 831 faces the insertion rod 72. A limiting spring 833 is fixedly connected to the inner bottom wall of the sleeve 831. A support rod 832 is also slidably inserted into the sleeve 831. One end of the support rod 832 located in the sleeve 831 is fixed to the end corresponding to the limiting spring 833, and the other end of the support rod 832 located outside the sleeve 831 is hinged to the insertion rod 72.

[0063] In the initial state, the limiting spring 833 is in a compressed state, and the length directions of both the sleeve 831 and the support rod 832 are perpendicular to the insertion rod 72. The striking plate 81 abuts against the fixed rod 71. The drive rod 82 is inclined, and the end of the drive rod 82 near the striking plate 81 is lower than the end of the drive rod 82 near the insertion rod 72.

[0064] When the scraper 6 moves the fixed rod 71 downward, the fixed rod 71 compresses the support spring 73, and the fixed rod 71 moves relative to the plug rod 72. The fixed rod 71 moves the striking plate 81 downward. At this time, the end of the drive rod 82 near the striking plate 81 moves downward with the striking plate 81. Since the length of the drive rod 82 is fixed, the drive rod 82 rotates in the direction closer to the plug rod 72. The drive rod 82 rotates and pulls the lower side of the striking plate 81 to rotate away from the fixed rod 71.

[0065] During the rotation of the striking plate 81, the striking plate 81 drives the sleeve 831 to move, causing the sleeve 831 to move relative to the support rod 832, and the limiting spring 833 to deform. During the non-flammability test, the positions of the sample cage 5 and the scraper 6 remain unchanged, so that the striking plate 81 remains in this state, and there is a gap between the striking plate 81 and the fixing rod 71.

[0066] When the sample cage 5 is removed, the support spring 73 and tension spring 74 return to their original deformation and drive the scraper 6 and fixing rod 71 to move upward. At the same time, the limit spring 833 returns to its original deformation and pushes the striking plate 81 to move. The drive rod 82 rotates and drives the striking plate 81 to rotate closer to the fixing rod 71 until the striking plate 81 comes into contact with the fixing rod 71, thereby striking the fixing rod 71. The fixing rod 71 vibrates after being struck, and the fixing rod 71 transmits the force to the furnace body 2 through the scraper 6, thereby shaking off the furnace ash on the inner wall of the furnace body 2 and improving the effect of collecting furnace ash on the furnace body 2.

[0067] The implementation principle of a building material non-combustibility testing furnace according to an embodiment of this application is as follows: When the sample cage 5 is placed into the furnace body 2, the nut 44 is rotated and the crossbar 42 is pressed to move the furnace body 2 downward. The movement of the furnace body 2 drives the scraper 6 and the fixing rod 71 to move. At the same time, the support spring 73 and the tension spring 74 are deformed, the drive rod 82 rotates and drives the striking plate 81 to rotate. The rotation of the striking plate 81 causes the limiting spring 833 to deform. When the sample cage 5 moves to the preset position, the nut 44 is rotated to fix the sample cage 5.

[0068] When the sample cage 5 is removed, rotate the nut 44 to move the nut 44 upward. At the same time, the support spring 73 and the tension spring 74 restore their deformation and push the plug rod 72, scraper 6 and sample cage 5 upward. The scraper 6 moves to scrape the inner wall of the furnace body 2. At the same time, the limit spring 833 restores its deformation, the drive rod 82 rotates, and the limit spring 833 and the drive rod 82 work together to drive the striking plate 81 to strike the fixed rod 71.

[0069] This application also provides a method for testing the non-combustibility of building materials, including the following steps:

[0070] S1. Take five cylindrical specimens with a diameter of 45mm and a height of 50mm;

[0071] S2. Place the sample in a drying oven to dry, remove it and cool it to room temperature, then weigh and record the weight of each sample.

[0072] S3. Start the furnace body 2 and maintain the temperature inside the furnace body 2 at 750 degrees Celsius;

[0073] S4. Place the sample into the sample cage 5 and rotate the nut 44. Press down the crossbar 42 to move the sample cage 5, scraper 6 and fixing rod 71 downward. The movement of fixing rod 71 causes the drive rod 82 to drive the striking plate 81 to rotate away from the fixing rod 71. At the same time, the limiting member 83 deforms. Finally, rotate the nut 44 to fix the position of the sample cage 5, scraper 6 and striking plate 81. Maintain this position for 30 minutes and observe and record the combustion behavior of the sample during the test.

[0074] S5. Rotate nut 44, support spring 73 and tension spring 74 restore deformation and drive scraper 6, fixed rod 71 and sample cage 5 to move upward. Scraper 6 moves to scrape the furnace ash on the inner wall of furnace body 2. At the same time, drive rod 82 and limiter 83 work to drive knocking plate 81 to knock on fixed rod 71, so that scraper 6 and furnace body 2 vibrate, which can shake off the furnace ash attached to the inner wall of furnace body 2.

[0075] S6. Collect the sample and the carbides, ash and other residues produced during sample combustion, weigh and record them;

[0076] S7. Measure and record the mass loss, and generate a test report after calculation.

[0077] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A building material non-combustibility test furnace comprising a box (1), a furnace body (2) located above the box (1) and fixed to the box (1), a rack (4) provided above the furnace body (2), and a test sample cage (5) installed on the rack (4), the test sample cage (5) being fixed to the rack (4) by a nut (44), characterized in that: The furnace body (2) is provided with an annular scraper (6), which contacts the inner wall of the furnace body (2). ​ The box (1) is provided with a connecting assembly (7) that supports the furnace body (2). The connecting assembly (7) includes several connecting rods (61) fixed on the sample cage (5). The connecting rods (61) are fixed to the scraper (6). The lower surface of the scraper (6) is connected to several support springs (73), and the lower end of the support springs (73) is fixed to the box body (1).

2. The building material non-combustibility test furnace according to claim 1, characterized by: The scraper (6) is inclined, and the outer side of the scraper (6) gradually tilts downwards towards the inner side.

3. The building material non-combustibility test furnace according to claim 2, characterized by: The connecting assembly (7) further includes a fixing rod (71) fixedly connected to the lower surface of the scraper (6), and a plug rod (72) that penetrates the scraper (6) and is slidably inserted into the scraper (6). The lower end of the fixing rod (71) is fixed to the upper end of the support spring (73).

4. The building material non-combustibility test furnace according to claim 3, characterized by: The number of fixed rods (71) and plug rods (72) is one each. A tension spring (74) is fixedly connected to the upper surface of the scraper (6). The upper end of the tension spring (74) is fixed to the inner top wall of the furnace body (2). The box (1) is provided with several striking components (8) that make the scraper (6) vibrate and thus strike the furnace body (2).

5. The building material non-combustibility test furnace according to claim 4, characterized by: The striking assembly (8) includes a striking plate (81) hinged to a fixed rod (71), the hinge axis of which is located on the upper side of the striking plate (81). A drive rod (82) is hinged to the lower side of the striking plate (81). The end of the drive rod (82) away from the striking plate (81) is hinged to the plug rod (72). The end of the drive rod (82) near the striking plate (81) is lower than the end of the drive rod (82) near the plug rod (72). A limiting member (83) is provided between the striking plate (81) and the plug rod (72) to press the striking plate (81) against the fixing rod (71). The limiting member (83) is an elastic member. The fixed end of the limiting member (83) is fixed to the plug rod (72), and the telescopic end of the limiting rod is fixed to the striking plate (81).

6. The building material non-combustibility testing furnace according to claim 5, characterized in that: A sleeve (831) is fixedly connected to the striking plate (81), and a support rod (832) is slidably inserted into the sleeve (831). One end of the support rod (832) is hinged to the insertion rod (72). A limit spring (833) is fixedly connected to the inner bottom wall of the sleeve (831), and the limit spring (833) is fixed to the support rod (832).

7. A building material non-combustibility testing furnace according to claim 5 or 6, characterized in that: The scraper (6) is an annular plate that fits into the fixing rod (71).

8. A building material non-combustibility testing furnace according to claim 4, characterized in that: The tension spring (74) is sleeved on the plug rod (72).

9. A method for testing the non-combustibility of building materials, characterized in that: The test was conducted using the test furnace described in any one of claims 1 to 8, and the specific steps are as follows: S1. Take five samples; S2. Dry the sample and then cool it to room temperature; S3. Start the furnace body (2) to maintain the temperature inside the furnace body (2) at the predetermined temperature; S4. Place the sample into the sample cage (5), push the sample cage (5) into the furnace body (2), fix the sample cage (5), keep it for thirty minutes, observe the combustion behavior of the sample during the test and record it. S5. Rotate the nut (44), the support spring (73) recovers its deformation and pushes the scraper (6) and the sample cage (5) upward. The scraper (6) scrapes the furnace ash on the inner wall of the furnace body (2) into the box (1). S6. Collect the sample and the products after the sample combustion, weigh and record them; S7. Measure and record the mass loss, and generate a test report after calculation.

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