Lossless automatic testing device for density of plate-felt-shaped heat insulation material
By designing an automated testing device and utilizing components such as load sensors and laser sensors, non-destructive, rapid, and accurate measurement of the density of felt-like thermal insulation materials was achieved, solving the problems of tool limitations and cumbersome operation in existing technologies.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-08
- Publication Date
- 2026-04-07
AI Technical Summary
Existing technologies for measuring the density of sheet-like thermal insulation materials suffer from limitations in tools and a trade-off between efficiency and accuracy, making non-destructive measurement impossible and cumbersome to perform.
An automatic testing device was designed, comprising a workbench, a weighing module, a length and width measurement module, a thickness measurement module, and a controller. It utilizes components such as a load sensor, a laser sensor, and an electric push rod to achieve non-destructive automatic density measurement.
It enables non-destructive, rapid, and accurate measurement of the density of felt-like thermal insulation materials, avoiding damage to the sample and simplifying the operation process.
Smart Images
Figure CN121805073A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of materials testing technology, and in particular to a non-destructive automatic testing device for the density of felt-like thermal insulation materials. Background Technology
[0002] The density of thermal insulation materials is a key indicator for evaluating their thermal insulation performance. However, current standards for density measurement methods generally have the following shortcomings: 1. Limitations of measuring tools: (1) Steel ruler / measuring tape: It can only measure the thickness of the sample edge, which is not representative enough, has low accuracy (±0.5 mm), and cannot apply controllable pressure; (2) Vernier calipers: Although pressure can be applied, the pressure cannot be quantified and is limited to edge measurement; (3) Needle thickness gauge: destructive testing (requires piercing the sample), large zeroing error; 2. The contradiction between efficiency and accuracy: Existing methods require manual operation of multiple tools, which is cumbersome, has a long measurement cycle, and results in high data dispersion; To address this, we propose a non-destructive automatic testing device for the density of felt-like thermal insulation materials. Summary of the Invention
[0003] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a non-destructive automatic testing device for the density of felt-like thermal insulation materials, comprising: The workbench is equipped with casters at the four corners of its bottom. The weighing module includes four load sensors distributed at the four corners of the top of the workbench, and a glass platform is provided on the top of the four load sensors. A baffle is provided on one side of the top of the glass platform. The length and width measurement module includes two first slide rails and a second slide rail disposed on the top sides and front side of the workbench. Two sliding members are respectively disposed on the two first slide rails, and three sliding members are respectively disposed on the second slide rails. A first laser sensor is fixed on the sliding member. A thickness measurement module includes two electric push rods respectively located on the front and rear sides of the top of the worktable. The telescopic ends of the two electric push rods are fixed to the bottom of a rectangular frame. Two pressure plate connectors are respectively provided on both sides of the rectangular frame, and pressure plates are fixed to the bottom ends of the pressure plate connectors. A distance measuring bracket is provided at the top of the worktable corresponding to the pressure plates, and a second laser sensor is provided on the distance measuring bracket facing the pressure plates. The controller, the load sensor, the first laser sensor, and the second laser sensor are electrically connected to the controller.
[0004] As a preferred embodiment of the non-destructive automatic testing device for the density of the felt-like thermal insulation material of the present invention, the sliding component includes a sliding block, a threaded hole is formed on the side wall of the sliding block, a bolt is threaded into the threaded hole, a support base is provided at the top of the sliding block, a snap-fit strip is erected at the top of the support base, a scale is provided on the outer wall of the snap-fit strip, a snap-fit block is provided on the outer wall of the snap-fit strip, a clamping groove and a slit are formed at one end of the snap-fit block, the outer wall of the snap-fit strip is disposed in the clamping groove, a support plate is provided on the side wall of the snap-fit block, and the first laser sensor is disposed at the top of the support plate.
[0005] As a preferred embodiment of the non-destructive automatic testing device for the density of the felt-like thermal insulation material of the present invention, the pressure plate connector includes two clamping blocks clamped on the upper and lower sides of a rectangular frame. A horizontal plate is provided at the bottom of the clamping block. Through holes are respectively opened on both sides of the horizontal plate. A metal rod is movably arranged in the through hole. The bottom end of the metal rod is connected to the top end of the pressure plate. A baffle with a diameter larger than the through hole is formed at the top end of the metal rod.
[0006] As a preferred embodiment of the non-destructive automatic testing device for the density of the felt-like thermal insulation material described in this invention, the length and width of the pressure plate are both 200mm, and the total weight of the pressure plate and the two metal rods is 200g.
[0007] As a preferred embodiment of the non-destructive automatic testing device for the density of the felt-like thermal insulation material of the present invention, the ranging bracket includes a vertical rod, a horizontal rod, and a connecting block. The two ends of the connecting block are respectively provided with a connecting groove and a slit. The vertical rod and the horizontal rod are respectively clamped in the connecting groove. The end of the horizontal rod is fixed with a second laser sensor through a connecting plate.
[0008] The beneficial effects of this invention are as follows: When the felt-like thermal insulation material is placed on a glass table with one side abutting against a baffle, four load sensors can send the weight information of the felt-like thermal insulation material to the controller, the length and width measurement module can send the length and width information of the felt-like thermal insulation material to the controller, and the thickness measurement module can measure the thickness information of the felt-like thermal insulation material and send the thickness information to the controller. By summarizing the weight information, length and width information, and thickness information, the controller can calculate the density of the felt-like thermal insulation material non-destructively, avoiding damage to the sample by the needle thickness gauge and ensuring the integrity of the sample for subsequent testing. Attached Figure Description
[0009] Figure 1 This is a visual representation of an automated, non-destructive testing device for the density of felt-like thermal insulation materials.
[0010] Figure 2 This is a visual representation of an automated non-destructive testing device for the density of felt-like thermal insulation materials, excluding the thickness measurement module and the controller.
[0011] Figure 3This is a diagram showing the distribution of four load sensors at the top of the workbench in an automated non-destructive testing device for the density of felt-like thermal insulation materials.
[0012] Figure 4 This is a schematic diagram of the structure of a non-destructive automatic testing device for the density of felt-like thermal insulation materials after removing the pressure plate connector and the pressure plate.
[0013] Figure 5 for Figure 4 Enlarged view of point A in the middle.
[0014] Figure 6 for Figure 4 Enlarged view of section B in the middle. Detailed Implementation
[0015] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Example 1
[0016] Reference Figures 1-6 This is the first embodiment of the present invention, which provides a non-destructive automatic testing device for the density of felt-like thermal insulation materials. The non-destructive automatic testing device for the density of felt-like thermal insulation materials includes a workbench 100, a weighing module 200, a length and width measurement module 300, a thickness measurement module 400, and a controller 500. The weighing module 200 weighs the felt-like thermal insulation material to be measured, the length and width measurement module 300 measures the length and width information, the thickness measurement module 400 measures the thickness information, and the controller 500 receives the weight information, length and width information, and thickness information and calculates the density.
[0017] Specifically, the workbench 100 has casters 101 installed at the four corners at the bottom.
[0018] Preferably, the weighing module 200 includes four load sensors 201 distributed at the top of the workbench 100 at four corners. A glass platform 202 is provided on the top of the four load sensors 201, and a baffle 203 is provided on one side of the top of the glass platform 202.
[0019] The felt-like thermal insulation material is placed on the glass table 202, with one side of the felt-like thermal insulation material abutting against the baffle 203. The four load sensors 201 can weigh the felt-like thermal insulation material.
[0020] Preferably, the length and width measurement module 300 includes two first slide rails 301 and a second slide rail 302 disposed on the top sides and front side of the worktable 100. Two sliding members are respectively disposed on the two first slide rails 301, and three sliding members are respectively disposed on the second slide rails 302. A first laser sensor 303 is fixed on the sliding member.
[0021] Two sliding members are slidably mounted on the first slide rails 301 on both sides of the top of the workbench 100. The sliding members on the two first slide rails 301 are slid to align with the felt-like thermal insulation material. The distance between the first laser sensors 303 on the two opposing sliding members is fixed as X. Since there are a total of four first laser sensors 303 on the two first slide rails 301, the four first laser sensors 303 can respectively measure the distances to the felt-like thermal insulation material as X1, X2, X3, and X4. Therefore, the lengths of the two sets of felt-like thermal insulation material can be measured: L1 = X - X1 - X2; L2 = X - X3 - X4. The average of the two measured lengths L1 and L2 is taken to obtain the final value. The length L is the length of the felt-like thermal insulation material. The three sliding members on the second sliding rail 302 are slidable so that the three first laser sensors 303 on the three sliding members are aligned with the side wall of the felt-like thermal insulation material. The distance between the three first laser sensors 303 on the three sliding members and the baffle 203 is fixed as Y. The distances between the three first laser sensors 303 and the side wall of the felt-like thermal insulation material are Y1, Y2 and Y3 respectively. Then the three width data measured by the three first laser sensors 303 are: M1=Y-Y1, M2=Y-Y2, M3=Y-Y3. The average of the three width data is taken to obtain the width M of the felt-like thermal insulation material.
[0022] Preferably, the thickness measurement module 400 includes electric push rods 401 respectively disposed on the front and rear sides of the top of the worktable 100. The telescopic rod ends of the two electric push rods 401 are respectively fixed to the bottom of the rectangular frame 402. Two pressure plate connectors 403 are respectively disposed on both sides of the rectangular frame 402. A pressure plate 404 is fixed to the bottom of the pressure plate connector 403. A distance measuring bracket 405 is disposed at the top of the worktable 100 corresponding to the pressure plate 404. A second laser sensor 406 is disposed on the distance measuring bracket 405 facing the pressure plate 404.
[0023] The telescopic rod of the electric push rod 401 is lowered, which in turn lowers the rectangular frame 402, thereby lowering the pressure plate connector 403 and the pressure plate 404, so that the pressure plate 404 is completely placed on the glass tabletop 202. At this time, the second laser sensor 406 directly opposite the pressure plate 404 measures the height of the pressure plate 404. The above operation is repeated to obtain the average height data three times and calculate the average value as D0. The felt-like thermal insulation material is placed on the glass tabletop 202, and the above operation is repeated to obtain the average height data three times and calculate the average value as D1. The height of the felt-like thermal insulation material measured by one of the pressure plates 404 is h = D1 - D0. The average height h obtained by the four pressure plates 404 is the height H, which is taken as the height of the felt-like thermal insulation material.
[0024] Preferably, the controller 500, the load sensor 201, the first laser sensor 303, and the second laser sensor 406 are electrically connected to the controller 500.
[0025] The controller 500 is a PLC control system. The controller 500 receives weight data transmitted by the load sensor 201, length and width information transmitted by the first laser sensor 303 in the length and width measurement module 300, and height information transmitted by the second laser sensor 406 in the thickness measurement module 400. Knowing the height, length and width information, the volume can be calculated, and the density value can be calculated using the density formula.
[0026] In use, the felt-like thermal insulation material is placed on the glass tabletop 202, with one side of the material resting against the baffle 203. Four load sensors 201 weigh the material and transmit the weight data to the controller 500. Two sliding members are slidably mounted on the first slide rails 301 on both sides of the top of the worktable 100. The sliding members on the two first slide rails 301 are slid together to align with the felt-like thermal insulation material. The distance between the first laser sensors 303 on the two opposing sliding members is fixed as X. Since there are a total of four first laser sensors 303 on the two first slide rails 301, each of the four sensors can measure the distance to the felt-like thermal insulation material. If the distances are X1, X2, X3, and X4, then two sets of length data for the felt-like thermal insulation material can be measured: L1 = X - X1 - X2; L2 = X - X3 - X4. The average of the measured lengths L1 and L2 is taken as the final length L, which is the length of the felt-like thermal insulation material. The three sliding members on the second slide rail 302 are slidable so that the three first laser sensors 303 on the three sliding members are aligned with the sidewall of the felt-like thermal insulation material. The distance between the three first laser sensors 303 on the three sliding members and the baffle 203 is fixed as Y. The three first laser sensors 303 measure the distances to the sidewall of the felt-like thermal insulation material as Y1, Y2, and Y3, respectively. The three distances measured by the three first laser sensors 303 are then... The width data are: M1=Y-Y1, M2=Y-Y2, M3=Y-Y3. The average of these three width data yields the width M of the felt-like insulation material. The telescopic rod of the electric push rod 401 is lowered, causing the rectangular frame 402 to also lower, which in turn lowers the pressure plate connector 403 and the pressure plate 404, ensuring that the pressure plate 404 is completely placed on the glass tabletop 202. At this point, the second laser sensor 406, directly opposite the pressure plate 404, measures the height of the pressure plate 404. This process is repeated three times, and the average height is calculated as D0. The felt-like insulation material is then placed on the glass tabletop 202, and this process is repeated until the pressure plate 404 is completely placed on the surface of the felt-like insulation material. The second laser sensor 406 measures the height of the pressure plate... The height of the 404 is calculated by repeating the above operation three times and taking the average height data as D1. The height of the felt-like thermal insulation material measured by one of the pressure plates 404 is h = D1 - D0. The average height h obtained by the four pressure plates 404 is taken as the height H of the felt-like thermal insulation material. The controller 500 receives the weight data transmitted by the load sensor 201, the length and width information transmitted by the first laser sensor 303 in the length and width measurement module 300, and the height information transmitted by the second laser sensor 406 in the thickness measurement module 400. After knowing the height, length and width information, the volume of the felt-like thermal insulation material can be calculated. The density value can be obtained by using the density formula. Example 2
[0027] Reference Figures 1-6 This is the second embodiment of the present invention, which is based on the previous embodiment.
[0028] Specifically, the sliding component includes a sliding block 304, a threaded hole on the side wall of the sliding block 304, a bolt 304a connected to the threaded hole, a support base 304b at the top of the sliding block 304, a snap-fit strip 304c standing upright at the top of the support base 304b, a scale 304d on the outer wall of the snap-fit strip 304c, a snap-fit block 304e on the outer wall of the snap-fit strip 304c, a clamping groove 304f and a slit 304g connected at one end of the snap-fit block 304e, the outer wall of the snap-fit strip 304c being disposed in the clamping groove 304f, a support plate 304h on the side wall of the snap-fit block 304e, and a first laser sensor 303 disposed at the top of the support plate 304h.
[0029] Since the lengths and widths of various felt-like thermal insulation materials are different, the first laser sensor 303 needs to be aligned with the felt-like thermal insulation material. The sliding block 304 in the sliding member can slide on the first slide rail 301 and the second slide rail 302 to a set position. After reaching the set position, tighten the bolt 304a. The bolt 304a will firmly press against the first slide rail 301 or the second slide rail 302, so that the position of the sliding block 304 remains fixed. Since the heights of various felt-like thermal insulation materials are also different, the height of the first laser sensor 303 also needs to be adjusted. Since one end of the snap-fit block 304e has a connecting... The clamping groove 304f and the slot 304g, and the snap-fit block 304e can be made of elastic materials such as metal, plastic or wood. By expanding the slot 304g, the opening of the clamping groove 304f can be widened and no longer clamped to the outer wall of the snap-fit strip 304c, so that it can be adjusted up and down. When adjusted to a suitable position, the expansion of the slot 304g can be stopped, or the outer wall of the slot 304g can be tied with a thin rope so that the clamping groove 304f continues to clamp the snap-fit strip 304c. The outer wall of the snap-fit strip 304c is provided with a scale 304d, which can be used to better display the height of the first laser sensor 303.
[0030] Preferably, the pressure plate connector 403 includes two clamping blocks 403a clamped on the upper and lower sides of the rectangular frame 402. A horizontal plate 403b is provided at the bottom end of the clamping block 403a. Through holes are opened on both sides of the horizontal plate 403b. A metal rod 403c is movably disposed in the through hole. The bottom end of the metal rod 403c is connected to the top end of the pressure plate 404. A baffle with a diameter larger than the through hole is formed at the top end of the metal rod 403c.
[0031] The two clamping blocks 403a can be fastened with screws or other screws in existing equipment. When the clamping blocks 403a descend with the rectangular frame 402 and drive the horizontal plate 403b to descend together, the pressure plate 404 first contacts the surface of the felt-like heat insulation material. As the horizontal plate 403b continues to descend, the weight of the pressure plate 404 and the two metal rods 403c presses on the surface of the felt-like heat insulation material.
[0032] Preferably, the length and width of the pressure plate 404 are both 200mm, and the total weight of the pressure plate 404 and the two metal rods 403c is 200g.
[0033] The weight of the pressure plate 404 and the two metal rods 403c presses on the surface of the felt insulation material, which can generate a pressure of 50pa on the surface of the felt insulation material. The pressure parameters can also be adjusted by replacing the pressure plate 404 with one of different weights to adapt to different material properties, avoid damage to the sample by the needle thickness gauge, and ensure the integrity of the sample for subsequent testing.
[0034] Preferably, the ranging bracket 405 includes a vertical rod 405a, a horizontal rod 405b, and a connecting block 405c. The two ends of the connecting block 405c are respectively provided with a connecting slot and a gap. The vertical rod 405a and the horizontal rod 405b are respectively clamped in the slot. The end of the horizontal rod 405b is fixed with a second laser sensor 406 through a connecting plate 405d.
[0035] The outer walls of the vertical rod 405a and the horizontal rod 405b can be clamped in the snap-fit groove of the connecting block 405c. The connecting block 405c is made of elastic materials such as metal, plastic or wood. The opening of the snap-fit groove can be enlarged by expanding the gap, which facilitates the movement of the vertical rod 405a and the horizontal rod 405b in the snap-fit groove, thereby controlling the height of the second laser sensor 406. When the second laser sensor 406 reaches the set height, the expansion of the gap stops, or the outer wall of the gap is tied with a thin rope so that the snap-fit groove continues to clamp the vertical rod 405a or the horizontal rod 405b.
[0036] In use, the felt-like thermal insulation material is placed on the glass tabletop 202, with one side of the material resting against the baffle 203. Since the lengths and widths of various felt-like thermal insulation materials differ, the first laser sensor 303 needs to be aligned with the material. The sliding block 304 in the sliding mechanism can slide on the first slide rail 301 and the second slide rail 302 to a set position. After reaching the set position, the bolt 304a is tightened, firmly pressing against the first slide rail 301 or the second slide rail 302, thus fixing the position of the sliding block 304. Since the heights of various felt-like insulation materials are not uniform, the height of the first laser sensor 303 also needs to be adjusted. Because one end of the snap-fit block 304e has a connected clamping groove 304f and a slit 304g, the snap-fit block 304e can be made of elastic materials such as metal, plastic, or wood. By expanding the slit 304g, the opening of the clamping groove 304f can be widened, no longer clamped to the outer wall of the snap-fit strip 304c, allowing for up-and-down sliding adjustment. When adjusted to a suitable position, the expansion of the slit 304g stops, or the slit can be tightened with a thin rope. The outer wall of the seam 304g allows the clamping groove 304f to continue clamping the snap-fit strip 304c. The outer wall of the snap-fit strip 304c is equipped with a scale 304d for better display of the height of the first laser sensor 303. Four load sensors 201 can weigh the felt-like insulation material. The load sensors 201 transmit the weight data to the controller 500. Two sliding members are slidably mounted on the first slide rails 301 on both sides of the top of the worktable 100. Sliding the sliding members on the two first slide rails 301 to align with the felt-like insulation material... The distance between the first laser sensors 303 on the two sliding parts is fixed as X. Since there are a total of four first laser sensors 303 on the two first slide rails 301, the four first laser sensors 303 can respectively measure the distances to the felt-like thermal insulation material as X1, X2, X3 and X4. Then, two sets of length data of the felt-like thermal insulation material can be measured, L1=X-X1-X2; L2=X-X3-X4. The average of the two sets of lengths L1 and L2 is taken to obtain the final length L, which is the length of the felt-like thermal insulation material.The three sliding members on the second slide rail 302 are slidable so that the three first laser sensors 303 on the three sliding members are aligned with the sidewall of the felt-like thermal insulation material. The distance between the three first laser sensors 303 on the three sliding members and the baffle 203 is fixed as Y. The three first laser sensors 303 measure the distances between themselves and the sidewall of the felt-like thermal insulation material as Y1, Y2 and Y3 respectively. The three width data measured by the three first laser sensors 303 are: M1=Y-Y1, M2=Y-Y2, M3=Y-Y3. The average of the three width data is taken to obtain the width of the felt-like thermal insulation material as M. The telescopic rod of the electric push rod 401 is controlled to descend, which drives the rectangular frame 402 to descend as well, and then drives the pressure plate connector 403 and the pressure plate 404 to descend, so that the pressure plate 404 is completely placed on the glass table 202. At this time, the second laser sensor 406 directly facing the pressure plate 404 measures the height of the pressure plate 404. The above operation is repeated three times. The average height data is calculated as D0. The felt-like insulation material is placed on the glass tabletop 202, and the above operation is repeated until the pressure plate 404 is completely placed on the surface of the felt-like insulation material. The second laser sensor 406 measures the height of the pressure plate 404. This operation is repeated three times, and the average height data is calculated as D1. The height of the felt-like insulation material measured by one of the pressure plates 404 is h = D1 - D0. The average height h obtained from the four pressure plates 404 is taken as the height H of the felt-like insulation material. The controller 500 receives the weight data transmitted by the load sensor 201, the length and width information transmitted by the first laser sensor 303 in the length and width measurement module 300, and the height information transmitted by the second laser sensor 406 in the thickness measurement module 400. Knowing the height, length, and width information, the volume of the felt-like insulation material can be calculated. The density value is then calculated using the density formula.
[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A non-destructive automatic testing device for the density of felt-like thermal insulation materials, characterized in that: include A workbench (100) is provided with casters (101) at the four corners at the bottom of the workbench (100). Weighing module (200), the weighing module (200) includes four load sensors (201) distributed at the top of the workbench (100) in a four-corner arrangement, the top of the four load sensors (201) is provided with a glass tabletop (202), and a baffle (203) is provided on one side of the top of the glass tabletop (202). The length and width measurement module (300) includes two first slide rails (301) and a second slide rail (302) disposed on the top sides and front side of the workbench (100). Two sliding members are respectively disposed on the two first slide rails (301), and three sliding members are respectively disposed on the second slide rail (302). A first laser sensor (303) is fixed on the sliding member. A thickness measurement module (400) includes electric push rods (401) respectively disposed on the front and rear sides of the top of the workbench (100). The telescopic ends of the two electric push rods (401) are respectively fixed to the bottom of a rectangular frame (402). Two pressure plate connectors (403) are respectively disposed on both sides of the rectangular frame (402). A pressure plate (404) is fixed to the bottom of the pressure plate connector (403). A distance measuring bracket (405) is disposed at the top of the workbench (100) corresponding to the pressure plate (404). A second laser sensor (406) is disposed on the distance measuring bracket (405) facing the pressure plate (404). The controller (500) is electrically connected to the load sensor (201), the first laser sensor (303), and the second laser sensor (406).
2. The non-destructive automatic testing device for the density of felt-like thermal insulation materials as described in claim 1, characterized in that: The sliding component includes a sliding block (304), a threaded hole is opened on the side wall of the sliding block (304), a bolt (304a) is threaded in the threaded hole, a support seat (304b) is provided at the top of the sliding block (304), a snap-fit strip (304c) is erected at the top of the support seat (304b), a scale (304d) is provided on the outer wall of the snap-fit strip (304c), a snap-fit block (304e) is provided on the outer wall of the snap-fit strip (304c), one end of the snap-fit block (304e) is provided with a connected clamping groove (304f) and a slit (304g), the outer wall of the snap-fit strip (304c) is provided in the clamping groove (304f), a support plate (304h) is provided on the side wall of the snap-fit block (304e), and the first laser sensor (303) is provided at the top of the support plate (304h).
3. The non-destructive automatic testing device for the density of felt-like thermal insulation materials as described in claim 1, characterized in that: The pressure plate connector (403) includes two clamping blocks (403a) clamped on the upper and lower sides of the rectangular frame (402). A horizontal plate (403b) is provided at the bottom of the clamping block (403a). Through holes are opened on both sides of the horizontal plate (403b). A metal rod (403c) is movably arranged in the through hole. The bottom end of the metal rod (403c) is connected to the top end of the pressure plate (404). A baffle with a diameter larger than the through hole is formed at the top end of the metal rod (403c).
4. The non-destructive automatic testing device for the density of felt-like thermal insulation materials as described in claim 1, characterized in that: The length and width of the pressure plate (404) are both 200mm, and the total weight of the pressure plate (404) and the two metal rods (403c) is 200g.
5. The non-destructive automatic testing device for the density of felt-like thermal insulation materials as described in claim 1, characterized in that: The ranging bracket (405) includes a vertical rod (405a), a horizontal rod (405b), and a connecting block (405c). The connecting block (405c) has a connecting slot and a gap at both ends. The vertical rod (405a) and the horizontal rod (405b) are respectively clamped in the slot. The end of the horizontal rod (405b) is fixed with a second laser sensor (406) through a connecting plate (405d).