An expandable graphite expansion force detection device and its detection method

Abstract

The present invention relates to the technical field of expandable graphite detection, and in particular to an expandable graphite expansion force detection device and a detection method thereof, including a base, on which sliding seats are symmetrically and slidably arranged. On the side of each sliding seat away from the symmetry center, a support rod is provided. Inside each support rod, a positioning rod is provided. A rotating rod is sleeved outside each positioning rod. A dial block is provided on each rotating rod. A chute is provided on the support rod, and positioning grooves are symmetrically provided on each support rod. The rotating rods are rotatably connected to fixing plates. On the fixing plates, extension cylinders cooperating with the sliding seats are symmetrically provided. On the base, fixing blocks are symmetrically provided, and on each fixing block, a limiting groove is provided. A limiting block is slidably arranged in each limiting groove. Thereby, the present invention can facilitate the operator to lay the expandable graphite sample flat by separating and docking the sliding seat and the extension cylinder, quickly and conveniently detect the expandable graphite, provide a quantitative index for the evaluation of the thermal expansion performance of the expandable graphite, and improve the accuracy of detection.

Description

Technical Field

[0001] The present invention relates to the technical field of expandable graphite detection, and particularly to a device and a method for detecting the expansion force of expandable graphite. Background Art

[0002] With the development of technology, the demand for high-performance materials is increasing day by day. Accurately measuring the expansion force performance of materials (the expansion force performance of materials under high-temperature conditions is one of their important physical characteristics, which directly affects their performance in industrial applications. For example, in the fields of construction, aerospace, and energy) has become a key link, and it is particularly important to establish a unified and standardized detection process.

[0003] Currently, in the existing detection methods for detecting the expansion force of expandable graphite, most of them directly put the expandable graphite into a muffle furnace for heating, and then transfer the expanded graphite to a graduated cylinder or other containers for detection, and then conduct a series of measurements (such as applying pressure, etc.) on the expanded graphite. However, when these detection devices move the expanded graphite, material loss often occurs, which not only pollutes the operating table but also affects the detection accuracy. Moreover, when detecting the expansion force, ensuring that the force-bearing end surface of the expanded graphite is flat can improve the detection accuracy. However, the naturally expanded graphite directly heated will present a fluffy state, and it is not easy to control its shape. Obviously, the existing directly heated detection devices are not only difficult to operate, but also the detection accuracy needs to be improved.

[0004] How to separate and dock the sliding seat and the extension cylinder to facilitate the operator to spread the expandable graphite sample flat, quickly and conveniently detect the expandable graphite, provide a quantitative index for the evaluation of the thermal expansion performance of expandable graphite, and improve the detection accuracy has become a technical problem that needs to be solved.

[0005] In summary, the existing technology obviously has inconveniences and defects in actual use, so it is necessary to improve it. Summary of the Invention

[0006] Aiming at the above defects, the purpose of the present invention is to provide a device and a method for detecting the expansion force of expandable graphite, which can separate and dock the sliding seat and the extension cylinder to facilitate the operator to spread the expandable graphite sample flat, quickly and conveniently detect the expandable graphite, provide a quantitative index for the evaluation of the thermal expansion performance of expandable graphite, and improve the detection accuracy.

[0007] To achieve the above object, the present invention provides a detection device for the expansion force of expandable graphite, including a base. On the base, sliding seats for placing expandable graphite samples are symmetrically and slidably arranged. On the side of each sliding seat away from the symmetric center, there is a support rod. Inside each support rod, there is a positioning rod. Outside each positioning rod, there is a rotating rod sleeved. On each rotating rod, there is a dial block. On the support rod, there is a chute cooperating with the dial block. On each support rod, positioning grooves cooperating with the dial block and communicating with the chute are symmetrically arranged. The end of each rotating rod away from the base is rotatably connected to a fixing plate. On the fixing plate, extension cylinders cooperating with the sliding seats are symmetrically arranged.

[0008] On the base, fixing blocks are symmetrically arranged. On each fixing block, there is a limit groove cooperating with the dial block. Inside each limit groove, a limit block is slidably arranged.

[0009] Pull the rotating rod, and the rotating rod drives the fixing plate to move up and down. When the sliding seat abuts against the extension cylinder, it can provide space for the heating expansion of the expandable graphite sample. When the sliding seat and the extension cylinder move away from each other, it is convenient for the operator to place the expandable graphite sample and weights into the sliding seat.

[0010] According to the detection device for the expansion force of expandable graphite of the present invention, an insertion rod is rotatably connected inside the rotating rod. One end of each insertion rod is inserted into the positioning rod. On the insertion rod inside the positioning rod, insertion blocks are symmetrically arranged. Inside the positioning rod, there are slots cooperating with the insertion blocks. The insertion blocks are slidably arranged in the slots.

[0011] According to the detection device for the expansion force of expandable graphite of the present invention, a convex ring is arranged at one end of each sliding seat close to the extension cylinder. On each extension cylinder, there is a mating groove cooperating with the convex ring. When the sliding seat abuts against the extension cylinder, the convex ring and the mating groove cooperate with each other.

[0012] According to the detection device for the expansion force of expandable graphite of the present invention, a fixing groove is arranged on each fixing block. Inside the fixing groove, a stop bar cooperating with the sliding seat is inserted. One end of each stop bar close to the sliding seat abuts against the sliding seat.

[0013] According to the detection device for the expansion force of expandable graphite of the present invention, placing grooves are symmetrically arranged on the base. Inside each placing groove, there is a slideway. The sliding seats are all slidably connected to the slideways.

[0014] The present invention also provides a detection method for the expansion force of expandable graphite, including the following steps:

[0015] Step 1. Sample preparation

[0016] Pull the fixing plate to the side away from the base. When the dial block slides to the positioning groove on the side away from the base, rotate the dial block to lock the position of the fixing plate. Weigh the expandable graphite sample, and place the weighed expandable graphite sample into the sliding seat. Slide the sliding seat back and forth to evenly spread the expandable graphite sample in the sliding seat, making the surface of the expandable graphite sample flat.

[0017] Step Two: Install Weights

[0018] Slide the sliding seat to directly below the extension cylinder. Place a weight on the expandable graphite sample in the sliding seat respectively. Insert the retaining bar into the fixing groove, make the sliding seat abut against the extension cylinder, and lock the position of the dial block using the limit block.

[0019] Step Three: Heat Treatment

[0020] Set the temperature of the muffle furnace. After the temperature of the muffle furnace stabilizes, record the initial time. Place the expandable graphite expansion force detection device steadily into the muffle furnace, close the furnace door, and perform constant-temperature heating.

[0021] Step Four: Cooling and Disassembly

[0022] Take out the expandable graphite expansion force detection device, and let it cool naturally to room temperature. Pull the limit block to the side away from the base, rotate the dial block, pull the fixing plate to the side away from the base. When the dial block slides to the positioning groove on the side away from the base, rotate the dial block to lock the position of the fixing plate, and take out the expanded expandable graphite sample.

[0023] Step Five: Measurement and Analysis

[0024] Measure the height of the expanded expandable graphite sample and record the reading. Organize the experimental data into a table form, including the expandable graphite sample number and the height of the expanded expandable graphite sample. Statistically analyze all the data and draw a trend chart.

[0025] According to the expandable graphite expansion force detection method of the present invention, in the said Step Three, when using the muffle furnace for constant-temperature heating, the constant-temperature heating is maintained for 30 minutes. During the constant-temperature heating, the furnace door of the muffle furnace shall not be opened to avoid affecting the temperature stability.

[0026] According to the expandable graphite expansion force detection method of the present invention, the said Steps One to Five should be repeated at least three times to verify the data reliability.

[0027] According to the expandable graphite expansion force detection method of the present invention, in the said Step One, when weighing the expandable graphite sample, use a high-precision electronic balance to accurately weigh 2.5 g or 5 g of expandable graphite sample.

[0028] The object of the present invention is to provide a detection device and a detection method for the expansion force of expandable graphite, including a sliding seat, an extension cylinder and a support rod. By adjusting the rotating rod, the sliding seat and the extension cylinder can be separated and docked, facilitating the operator to lay the expandable graphite sample flat, enabling quick and convenient detection of the expandable graphite and improving the accuracy of detection. The present invention also provides a detection method for the expansion force of expandable graphite, which can intuitively display the change law of the expansion performance of the expandable graphite sample and provide a quantitative index for the evaluation of the thermal expansion performance of expandable graphite. In summary, the beneficial effects of the present invention are: by separating and docking the sliding seat and the extension cylinder, it is convenient for the operator to lay the expandable graphite sample flat, quickly and conveniently detect the expandable graphite, provide a quantitative index for the evaluation of the thermal expansion performance of expandable graphite, and improve the accuracy of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of the present invention after installation; Figure 2 It is a structural diagram of the present invention and the matching weights; Figure 3 It is a structural diagram of the present invention when the fixing plate is pulled up; Figure 4 It is a structural diagram of the limiting groove and the limiting block; Figure 5 It is a sectional view of the rotating rod; In the figure: 1 - base, 11 - placing groove, 111 - slideway, 12 - fixing block, 121 - fixing groove, 122 - limiting groove, 123 - limiting block, 2 - sliding seat, 21 - convex ring, 3 - support rod, 31 - sliding groove, 311 - positioning groove, 32 - rotating rod, 321 - dial block, 322 - inserting rod, 33 - positioning rod, 4 - fixing plate, 41 - extension cylinder, 5 - retaining bar, 6 - weight. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0032] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, terms such as "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0033] See Figures 1 to 5 , the present invention provides a detection device for the expansion force of expandable graphite, including a base 1. Symmetrically sliding seats 2 are provided on the base 1 (placement grooves 11 are symmetrically provided on the base 1, slideways 111 are provided in the placement grooves 11, and the sliding seats 2 are all slidably connected in the slideways 111). Storage grooves for placing expandable graphite samples are provided on the sliding seats 2. Support rods 3 are provided on the base 1 on the side of the sliding seats 2 away from the symmetry center. Positioning rods 33 are provided inside the support rods 3. Rotating rods 32 are sleeved outside the positioning rods 33. Dial blocks 321 are provided on the rotating rods 32. One end of each dial block 321 away from the rotating rod 32 passes through the support rod 3. A chute 31 cooperating with the dial block 321 is provided on the support rod 3. The chute 31 is vertically arranged, and the dial block 321 can drive the rotating rod 32 to slide up and down in the chute 31. Positioning grooves 311 cooperating with the dial block 321 are symmetrically provided on the support rods 3. The positioning grooves 311 on each support rod 3 communicate with the chute 31. One end of each rotating rod 32 away from the base 1 passes through the support rod 3. A fixing plate 4 is sleeved on the two rotating rods 32 outside the support rod 3, and the rotating rods 32 are all rotatably connected to the fixing plate 4. The rotating rods 32 can drive the fixing plate 4 to lift and lower; pull the rotating rod 32, and the rotating rod 32 drives the fixing plate 4 to perform a lifting and lowering movement. When the dial block 321 slides to the positioning groove 311, rotate the dial block 321, and the dial block 321 drives the rotating rod 32 to rotate. When the dial block 321 rotates into the positioning groove 311, the position of the rotating rod 32 can be temporarily locked, so as to lock the position of the fixing plate 4.

[0034] See Figure 5 , preferably, an insertion rod 322 is rotatably connected inside the rotating rod 32. One end of each insertion rod 322 is inserted into the positioning rod 33. Insertion blocks are symmetrically provided on the insertion rod 322 inside the positioning rod 33. Slots cooperating with the insertion blocks are provided inside the positioning rod 33. The insertion blocks are all slidably arranged in the slots. The insertion rod 322 can improve the stability of the rotating rod 32 during the lifting and lowering process of the rotating rod 32.

[0035] See Figures 1 to 3, symmetrically arranged on the fixed plate 4 are extension cylinders 41 that cooperate with the sliding seat 2 (the inside of the extension cylinder 41 is hollow, and the diameter of the hollow part inside the extension cylinder 41 is approximately equal to the diameter of the storage groove of the sliding seat 2. When the sliding seat 2 abuts against the extension cylinder 41, a cylindrical space can be formed inside the sliding seat 2 and the extension cylinder 41). The extension cylinder 41 can move with the fixed plate 4. When the sliding seat 2 abuts against the extension cylinder 41, it can provide space for the thermal expansion of the expandable graphite sample. When the sliding seat 2 and the extension cylinder 41 move away from each other, it is convenient for the operator to place the expandable graphite sample and the weight 6 into the sliding seat 2 (the weight 6 is used in combination with the sliding seat 2 and the extension cylinder 41. The diameter of the weight 6 matches the diameter of the hollow part inside the extension cylinder 41 and the diameter of the storage groove. The weight 6 can be smoothly placed inside the sliding seat 2 and the extension cylinder 41. And when the weight 6 is inside the sliding seat 2 and the extension cylinder 41, the outer circumference of the weight 6 can abut against the inner wall of the sliding seat 2 or the extension cylinder 41), enabling the operator to spread the expandable graphite sample flat and then place the weight 6 on the expandable graphite sample, facilitating the operation of the operator and improving the accuracy of the detection of the expandable graphite sample.

[0036] See Figures 1 to 3 , preferably, convex rings 21 are provided at one end of the sliding seat 2 close to the extension cylinder 41, and mating grooves that cooperate with the convex rings 21 are provided on the extension cylinder 41. When the sliding seat 2 abuts against the extension cylinder 41, the convex rings 21 and the mating grooves cooperate with each other to improve the stability between the sliding seat 2 and the extension cylinder 41.

[0037] See Figures 1 to 4 , fixing blocks 12 are symmetrically arranged on the base 1, limiting grooves 122 that cooperate with the dial blocks 321 are provided on the fixing blocks 12, limiting blocks 123 are slidably arranged in the limiting grooves 122, and the limiting blocks 123 are all slidably connected to the fixing blocks 12 (convex blocks are symmetrically arranged on the limiting blocks 123 inside the fixing blocks 12, and grooves that cooperate with the convex blocks are provided inside the fixing blocks 12. The convex blocks are all slidably arranged in the grooves), and the dial blocks 321 can be smoothly turned into the limiting grooves 122; when the dial blocks 321 rotate to the inside of the positioning grooves 311 on the side close to the base 1, the sliding seat 2 and the extension cylinder 41 just abut against each other. Pull the limiting blocks 123 towards the side away from the base 1, and the limiting blocks 123 move upward, thus exposing all of the limiting grooves 122. Rotate the dial blocks 321. When the dial blocks 321 can no longer rotate, release the limiting blocks 123, and the limiting blocks 123 fall, thus blocking the dial blocks 321 in the limiting grooves 122, thereby preventing the dial blocks 321 from rotating randomly and ensuring the tightness of the abutment between the sliding seat 2 and the extension cylinder 41.

[0038] See Figures 1 to 3, Further, fixing grooves 121 are provided on the fixing blocks 12, and a bar 5 that cooperates with the two sliding seats 2 is inserted into the two fixing grooves 121. One end of the bar 5 close to the sliding seat 2 abuts against the sliding seat 2. The bar 5 can limit the position of the sliding seat 2 and ensure that the sliding seat 2 is located directly below the extension cylinder 41 before the sliding seat 2 is docked with the extension cylinder 41.

[0039] See Figures 1 to 5 , In use, pull the fixing plate 4 away from the base 1. When the dial block 321 slides to the positioning groove 311 on the side away from the base 1, rotate the dial block 321. When the dial block 321 rotates into the positioning groove 311 on the side away from the base 1, temporarily lock the position of the rotating rod 32. At this time, slide the sliding seat 2. Place the expandable graphite sample in the sliding seat 2 and slide the sliding seat 2 back and forth to make the expandable graphite sample in the sliding seat 2 evenly distributed (the operator can manually assist in laying the expandable graphite sample flat). After sliding the sliding seat 2 directly below the extension cylinder 41, place a weight 6 on the expandable graphite sample in the sliding seat 2 respectively. Insert the bar 5 into the fixing groove 121 to prevent the sliding seat 2 from sliding randomly. Rotate the dial block 321 to disengage the dial block 321 from the positioning groove 311 on the side away from the base 1. Push the fixing plate 4 towards the base 1 and pull the limiting block 123 away from the base 1 at the same time to expose all the limiting grooves 122. When the sliding seat 2 just abuts against the extension cylinder 41, rotate the dial block 321 into the positioning groove 311 on the side close to the base 1 and release the limiting block 123, that is, complete the docking of the sliding seat 2 and the extension cylinder 41. Transfer the present invention to the heating container to start the detection.

[0040] See Figures 1 to 5 , Based on the above detection device, the present invention also provides a method for detecting the expansion strength of expandable graphite, including the following steps:

[0041] Step 1. Sample preparation

[0042] Pull the fixing plate 4 away from the base 1. When the dial block 321 slides to the positioning groove 311 on the side away from the base 1, rotate the dial block 321 to lock the position of the fixing plate 4. Use a high-precision electronic balance (the accuracy needs to reach 0.0001 g) to accurately weigh 2.5 g or 5 g (the weighed weight can be adjusted according to the actual situation) of expandable graphite sample, and place the weighed expandable graphite sample into the sliding seat 2. Slide the sliding seat 2 back and forth to evenly flatten the expandable graphite sample in the sliding seat 2 and make its surface as flat as possible without obvious concavities and convexities.

[0043] Step 2. Install weights

[0044] Slide the sliding seat 2 to directly below the extension cylinder 41. Place a weight 6 on the expandable graphite sample within the sliding seat 2. Insert the stop bar 5 into the fixing groove 121 to make the sliding seat 2 abut against the extension cylinder 41, and lock the position of the dial block 321 using the limit block 123.

[0045] Step Three: Heat Treatment

[0046] Set the temperature of the muffle furnace to 600 °C. After the temperature stabilizes, record the initial time. Use a fixture (such as crucible tongs, etc.) to gently place the expandable graphite expansion force detection device (including structures such as the sliding seat 2, extension cylinder 41, and base 1) into the muffle furnace, and close the furnace door. Keep it for 30 minutes under constant temperature conditions. Do not open the furnace door during this period to avoid affecting temperature stability.

[0047] Step Four: Cooling and Disassembly

[0048] After taking out the expandable graphite expansion force detection device, let it cool naturally to room temperature. Disassemble the mold. Pull the limit block 123 towards the side away from the base 1, rotate the dial block 321 (the rotation of the dial block 321 can be assisted by rotating the rotating rod 32), pull the fixing plate 4 towards the side away from the base 1. When the dial block 321 slides to the positioning groove 311 on the side away from the base 1, rotate the dial block 321 to lock the position of the fixing plate 4, and take out the expanded expandable graphite sample, taking care to keep the sample intact.

[0049] Step Five: Measurement and Analysis

[0050] Use a digital caliper (with a precision of up to 0.01 mm) to accurately measure the height of the expanded expandable graphite sample and record the reading. If multiple measurements are required to verify the data reliability, the above steps should be repeated at least three times. Organize the data obtained from each experiment into a table form, including information such as the expandable graphite sample number and the height of the expanded expandable graphite sample. Conduct statistical analysis on all the data and draw a trend chart to visually display the variation law of the sample expansion performance.

[0051] Using the above expandable graphite expansion force detection method, through parameters such as the weight of the weight 6, the height of the expanded expandable graphite sample, the heating temperature of the muffle furnace, and the heating time of the muffle furnace, the variation law of the expansion performance of the expandable graphite sample can be visually demonstrated. Operators can adjust the process steps of the expandable graphite sample according to the actual needs of customers based on the variation law of the expansion performance of the expandable graphite sample, thereby changing the performance of the expandable graphite sample.

[0052] The present invention provides a device for detecting the expansion force of expandable graphite, which includes a sliding seat, an extension cylinder and a support rod. By adjusting the rotating rod, the sliding seat and the extension cylinder can be separated and docked, facilitating the operator to spread the expandable graphite sample flat, enabling rapid and convenient detection of the expandable graphite and improving the accuracy of detection. The present invention also provides a method for detecting the expansion force of expandable graphite, which can intuitively show the variation law of the expansion performance of the expandable graphite sample and provide a quantitative index for the evaluation of the thermal expansion performance of expandable graphite. In summary, the beneficial effects of the present invention are: by separating and docking the sliding seat and the extension cylinder, it is convenient for the operator to spread the expandable graphite sample flat, rapidly and conveniently detect the expandable graphite, provide a quantitative index for the evaluation of the thermal expansion performance of expandable graphite, and improve the accuracy of detection.

[0053] Certainly, the present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. An expandable graphite expansion force detection device, characterized in that, It includes a base, on which symmetrically sliding sliders for placing expandable graphite samples are provided. On one side of each slider away from the symmetric center, a support rod is provided. Inside each support rod, a positioning rod is provided. A rotating rod is sleeved outside each positioning rod. A dial is provided on each rotating rod. A chute cooperating with the dial is provided on the support rod. Positioning grooves cooperating with the dial and communicating with the chute are symmetrically provided on each support rod. One end of each rotating rod away from the base is rotatably connected to a fixing plate, and extension cylinders cooperating with the sliders are symmetrically provided on the fixing plate. Fixed blocks are symmetrically provided on the base. A limiting groove cooperating with the dial is provided on each fixed block. A limiting block is slidably provided in each limiting groove. When the dial rotates into the positioning groove, the limiting block is pulled towards the side away from the base to expose the entire limiting groove. Then the dial is rotated and the limiting block is released to block the dial in the limiting groove, thereby preventing the dial from rotating. The rotating rod is pulled, and the rotating rod drives the fixing plate to move up and down. When the slider abuts against the extension cylinder, space can be provided for the heating expansion of the expandable graphite sample. When the slider and the extension cylinder move away from each other, it is convenient for the operator to place the expandable graphite sample and weights into the slider.

2. The expandable graphite expansion force detection device according to claim 1, characterized in that, An inserting rod is rotatably connected inside the rotating rod. One end of each inserting rod is inserted into the positioning rod. Inserting blocks are symmetrically provided on the inserting rod inside the positioning rod. A slot cooperating with the inserting block is provided inside the positioning rod, and the inserting blocks are slidably arranged in the slots.

3. The expandable graphite expansion force detection device according to claim 1, characterized in that, A convex ring is provided at one end of each slider close to the extension cylinder. A cooperating groove cooperating with the convex ring is provided on each extension cylinder. When the slider abuts against the extension cylinder, the convex ring and the cooperating groove cooperate with each other.

4. The expandable graphite expansion force detection device according to claim 1, characterized in that, A fixing groove is provided on each fixed block. A stop bar cooperating with the slider is inserted into the fixing groove. One end of each stop bar close to the slider abuts against the slider.

5. The expandable graphite expansion force detection device according to claim 1, characterized in that Placing grooves are symmetrically provided on the base. A slideway is provided in each placing groove, and the sliders are all slidably connected in the slideways.

6. A method for detecting the expansion force of expandable graphite, based on the expandable graphite expansion force detection device described in claim 4, characterized in that, It includes the following steps: Step 1. Sample preparation The fixing plate is pulled towards the side away from the base. When the dial slides to the positioning groove on the side away from the base, the dial is rotated to lock the position of the fixing plate. The expandable graphite sample is weighed and the weighed expandable graphite sample is placed into the slider. The slider is reciprocally slid to evenly spread the expandable graphite sample in the slider and make the surface of the expandable graphite sample flat. Step 2. Installing weights The slider is slid to directly below the extension cylinder. A weight is respectively placed on the expandable graphite sample in the slider. The stop bar is inserted into the fixing groove to make the slider abut against the extension cylinder, and the position of the dial is locked by using the limiting block. Step 3. Heating treatment The temperature of the muffle furnace is set. After the temperature of the muffle furnace is stable, the initial time is recorded. The expandable graphite expansion force detection device is smoothly placed into the muffle furnace, and the furnace door is closed for constant temperature heating. Step 4. Cooling and disassembly Take out the expandable graphite expansion force detection device, let it cool naturally to room temperature, pull the limit block to the side away from the base, rotate the dial, pull the fixing plate to the side away from the base. When the dial slides to the positioning groove on the side away from the base, rotate the dial to lock the position of the fixing plate, and take out the expanded expandable graphite sample. Step 5. Measurement and Analysis Measure the height of the expanded expandable graphite sample and record the reading. Organize the experimental data into a table form, including the expandable graphite sample number and the height of the expanded expandable graphite sample. Statistically analyze all the data and draw a trend chart.

7. The method for detecting the expansion force of expandable graphite according to claim 6, characterized in that, In Step 3, when using the muffle furnace for constant temperature heating, maintain the constant temperature heating for 30 minutes. During the constant temperature heating, do not open the muffle furnace door to avoid affecting the temperature stability.

8. The method for detecting the expansion strength of expandable graphite according to claim 6, characterized in that The above Steps 1 to 5 should be repeated at least three times to verify the reliability of the data.

9. The method for detecting the expansion force of expandable graphite according to claim 6, characterized in that In Step 1, when weighing the expandable graphite sample, use a high-precision electronic balance to accurately weigh 2.5 g or 5 g of the expandable graphite sample.

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