A method for testing heat insulation board

Abstract

The present invention discloses a method for testing a heat insulation board. The heat insulation board is tested in a testing device. The testing device includes a cavity. The heat insulation board includes an upper surface and a lower surface. The heat insulation board is provided with a groove portion. The groove portion includes a groove one and a groove two. The test steps include: ① Pressing down the heat insulation board to form a concave portion. In this state, the heat insulation board also includes plane ends located on the left and right sides of the concave portion. During the process of the concave portion being concave downward, the plane ends move toward the concave portion, and the thickness of the heat insulation board remains the same; ② The lower surface is heated to a test temperature, and the temperature change of the upper surface is recorded in real time; ③ Pulling up the heat insulation board to restore the heat insulation board to a flat plate shape; ④ Pressing down the heat insulation board again to reduce the thickness of the heat insulation board. In this state, the lower surface is heated to a test temperature, and the temperature change of the upper surface is recorded in real time. The present invention provides a method for testing a heat insulation board, which can detect the heat insulation performance of a heat insulation board after being deformed by force.

Description

Technical Field

[0001] The present invention relates to the technical field of heat insulation board detection, and more specifically, to a test method for a heat insulation board. Background Art

[0002] Aerogel is a popular choice as a thermal insulation material due to its low density, high porosity and small pore size. In the detection of aerogel as a thermal insulation board, one end face is heated and the temperature change of the other end face is detected to measure its thermal insulation performance. At present, in the actual application of aerogel as a thermal insulation board, after the thermal insulation board is bent by external force, the air gap structure inside the aerogel will deform, so it is necessary to measure its thermal insulation performance after deformation. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and to provide a testing method for a heat insulation board, which can detect the heat insulation performance of the heat insulation board after being deformed by force.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a test method for a heat insulation board, which is used to test the heat insulation performance of the heat insulation board. The heat insulation board is tested in a test device, and the test device includes a cavity, the heat insulation board is placed in the cavity, the heat insulation board is in the shape of a flat plate, the heat insulation board includes an upper surface and a lower surface located at the upper and lower sides, and grooves are provided on the front and rear sides of the heat insulation board, and the grooves include a groove 1 and a groove 2 located below the groove 1; and also includes the following test steps: ① Pressing down the heat insulation board to form a concave portion of the heat insulation board, in this state, the heat insulation board also includes plane ends located on the left and right sides of the concave portion, and during the process of the concave portion being concave downward, the plane ends move toward the concave portion, and the thickness of the heat insulation board remains the same; ② The lower surface is heated to the test temperature, and the temperature change of the upper surface is recorded in real time; ③ Pulling up the heat insulation board to restore the heat insulation board to a flat plate shape; ④ Pressing down the heat insulation board again to reduce the thickness of the heat insulation board, in this state, heating the lower surface to the test temperature, and recording the temperature change of the upper surface in real time.

[0005] The present invention is further configured such that the cavity includes an air inlet end and an air outlet end, so as to control the temperature inside the cavity so that the temperature inside the cavity is the same as that of the upper surface.

[0006] The present invention is further configured such that the groove portion passes through the heat insulation board from top to bottom.

[0007] The present invention is further configured such that the width of the upper end of the groove one is greater than the width of the lower end, and the width of the lower end of the groove is the same as the width of the groove two.

[0008] The present invention is further configured to include a testing device, which includes a base plate, a heating plate is installed on the upper end of the base plate, the heating plate is located in the cavity, and the upper wall surface of the heating plate can fit with the lower surface; the testing device also includes a pressing plate, which can move up and down, the pressing plate is located above the insulation plate, and the lower wall surface of the pressing plate can abut or press down the upper surface; the testing device also includes a slide plate, the slide plate is located on the left and right sides of the heating plate, the slide plate can move left and right, the slide plate is provided with a groove body two, and the left and right sides of the insulation plate are respectively inserted into the corresponding groove bodies two.

[0009] The present invention is further configured such that the heating plate comprises a groove body 1 corresponding to the recessed portion, and a wall surface of the groove body 1 can be fitted with a lower wall surface of the recessed portion.

[0010] The present invention is further configured such that the pressing plate includes a boss located at the bottom, the boss can be inserted into the groove portion, and the wall surface of the boss can fit with the wall surface of the groove portion.

[0011] The present invention is further configured such that, when the heat insulation board is extruded, it is extruded to one third to one half of the original thickness.

[0012] In summary, the present invention has the following beneficial effects:

[0013] By pressing the aerogel insulation board down to make it bend, the air gap structure inside the aerogel insulation board changes, and its thermal insulation performance is measured in this state, which can better reflect its thermal insulation performance as an insulation material in actual application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a cross-sectional view of a heat insulation board in an embodiment;

[0015] Figure 2 for Figure 1 Sectional view along the MM direction;

[0016] Figure 3 is a three-dimensional diagram of a test device in an embodiment;

[0017] Figure 4 A cross-sectional view of the test device in the embodiment Figure 1 ;

[0018] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0019] Figure 6 A cross-sectional view of the test device in the embodiment Figure 2 ;

[0020] Figure 7 for Figure 6 The enlarged view of point B in the middle;

[0021] Figure 8A cross-sectional view of the test device in the embodiment Figure 3 ;

[0022] Fig. 9 for Figure 8 Enlarged view of point C in the middle.

[0023] Figure numerals: bottom plate 1, side plate 11, channel 111, pad 12, heating plate 13, trough body 131, end face 132, slide rail 15, slide plate 16, trough body 2 161, countersunk hole 162, rod body 17, rod head 171, spring 18, driving component 1 19, driving component 2 2, pressure plate 21, plane portion 211, convex portion 212, boss 213, heat insulation board 3, groove portion 31, groove 1 311, groove 2 312, plane end 32, recessed portion 33, upper surface 34, lower surface 35, sliding door 4, cavity 5. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1-Figure 9 As shown, this embodiment discloses a test method for a heat insulation board, which is used to test the heat insulation performance of the heat insulation board 3. The heat insulation board 3 is tested in a test device, which includes a bottom plate 1, a side plate 11 is installed on the upper end of the bottom plate 1, and the side plates 11 are distributed along the outer periphery of the bottom plate 1. The top of the side plate 11 is closed by a cover plate, and an opening is provided on one side of the side plate 11. A sliding door 4 is installed at the opening, and the material discharge and material collection operation is performed by opening and closing the sliding door 4. The side plate 11, the bottom plate 1, and the cover plate on the top of the side plate 11 together surround a cavity 5.

[0026] like Figure 4 As shown, the side panel 11 includes a channel 111, and the channel 111 is symmetrically arranged on the left and right, wherein one channel 111 is an air inlet end, and the other channel 111 is an air outlet end. The external cooling fan can control the temperature of the cavity 5 through the channel 111, and a temperature sensor is installed in the corresponding cavity 5 to timely feedback the real-time temperature value.

[0027] like Figure 4 As shown, a pad 12 is installed on the upper end of the base plate 1, and a heating plate 13 is installed on the upper end of the pad 12. The heating plate 13 is located in the cavity 5. After the heating plate 13 is powered on, it can be heated to more than 800 degrees to meet the test requirements.

[0028] like Figure 4 , Figure 5As shown, the upper end of the heating plate 13 is provided with a groove body 131, which is concave and extends downward along the upper end surface of the heating plate 13 to form a long arc groove. The heating plate 13 also includes an end surface 132 located at the top, which is located on the left and right sides of the groove body 131 and is a horizontal surface.

[0029] The end surface 132 can be used to place the heat insulation board 3, which is made of aerogel and has a certain elasticity. The heat insulation board 3 is located in the cavity 5. Figure 1 As shown, the heat insulation board 3 is a flat plate, combined with Figure 2 , Figure 2 It is a cross-sectional view of the heat insulation board 3 which is depressed by pressure. The heat insulation board 3 includes an upper surface 34 and a lower surface 35 located at upper and lower sides. After being subjected to pressure, the heat insulation board 3 forms a plane end 32 and a depressed portion 33 . The plane end 32 is located at the left and right sides of the depressed portion 33 . Figure 1 In the figure, groove portions 31 are provided on both the front and rear sides of the heat insulation board 3. The groove portions 31 pass through the heat insulation board 3 from top to bottom. The groove portions 31 include a groove 1 311 and a groove 2 312 located below the groove 1 311. The width of the upper end of the groove 1 311 is greater than the width of the lower end, and the width of the lower end of the groove 1 311 is the same as the width of the groove 2 312.

[0030] like Figure 4 As shown, the heating plates 13 extend out from the left and right sides of the heat insulation plate 3 .

[0031] By controlling the temperature in the cavity 5 so that the temperature in the cavity 5 is the same as that on the upper surface 34, the heat exchange between the cavity 5 and the upper surface 34 is minimized. The heat of the upper surface 34 basically comes from its internal heat transfer or heat convection, so its temperature change can better reflect its thermal insulation performance.

[0032] like Figure 4 , Figure 5 As shown, a slide rail 15 is installed on the upper end of the bottom plate 1, and the slide rail 15 is located on the left and right sides of the heating plate 13. The slide rail 15 is slidably connected to a slide plate 16, and the slide plate 16 can move left and right to approach or move away from the heating plate 13. A second groove 161 is provided on the side of the slide plate 16 close to the heating plate 13, and the end of the heat insulation plate 3 extending out of the heating plate 13 can be inserted into the second groove 161 and abut against the inner wall of the second groove 161. When the slide plates 16 on both sides move toward the side close to the heating plate 13, the left and right sides of the heat insulation plate 3 can be pushed toward the center.

[0033] The upper wall surface of the heating plate 13 can fit with the lower surface 35, and the heating plate 13 can heat the lower surface 35 to heat the insulation board 3, and the temperature is transferred from bottom to top to the upper surface 34. The thermal insulation capacity of the insulation board 3 is tested by detecting the temperature of the upper surface 34.

[0034] The heating plate 13 includes a groove body 131 corresponding to the recessed portion 33, and the wall surface of the groove body 131 can fit with the lower wall surface of the recessed portion 33 to detect the thermal insulation performance of the thermal insulation plate 3 when it is under pressure and in a bent state.

[0035] The testing device also includes a pressing plate 21, which can move up and down by driving a driving component 2. The driving component 2 is a servo hydraulic cylinder. The pressing plate 21 is located above the insulation board 3. When the pressing plate 21 moves downward, its lower wall surface can abut or press down the upper surface 34.

[0036] like Figure 4 , Figure 5 As shown, the pressing plate 21 includes a convex portion 212 and a flat portion 211 located on both sides of the convex portion 212, the flat portion 211 corresponds to the end surface 132, and the convex portion 212 corresponds to the groove body 131. Multiple temperature sensor probes are installed inside the pressing plate 21 to detect the temperature of multiple points of the pressing plate 21 in real time.

[0037] The pressing plate 21 further includes a boss 213 at the bottom. The boss 213 corresponds to the groove portion 31 one by one. The boss 213 can be inserted into the groove portion 31 , and the wall surface of the boss 213 can fit with the wall surface of the groove portion 31 .

[0038] like Figure 5 As shown, the slide plate 16 is slidably connected with a rod body 17, and the rod body 17 is connected with a driving component 19, which is a cylinder. The driving component 19 can drive the slide plate 16 to drive the slide plate 16 to move left and right. Specifically, the rod body 17 passes through the slide plate 16, and the slide plate 16 is provided with a countersunk hole 162. The rod body 17 is provided with a rod head 171, and the rod head 171 is located on the side close to the heating plate 13. The rod head 171 is inserted into the countersunk hole 162, and the rod head 171 is kept in contact with the inner wall of the countersunk hole 162 in the horizontal direction. The rod body 17 is sleeved with a spring 18, and one end of the spring 18 abuts against the connecting plate of the output end of the driving component 19, and the other end abuts against the slide plate 16. When the output end of the driving component 19 is retracted, the rod head 171 pulls the slide plate 16 to move the slide plate 16 away from the heating plate 13; when the output end of the driving component 19 is extended, the spring 18 pushes the slide plate 16 to move the slide plate 16 to the side close to the heating plate 13.

[0039] During the process of forming the recessed portion 33 by the heat insulation board 3 under pressure, the recessed portion 33 is squeezed from a flat plate to form an arc, and the plane ends 32 on the left and right sides of the recessed portion 33 gather toward the center of the recessed portion 33 and form a movement phenomenon. However, due to the resistance caused by the pressing plate 21 and the heating plate 13 to the heat insulation board 3, the interior of the recessed portion 33 is stretched left and right after it is formed, resulting in a structural difference between the recessed portion 33 and the heat insulation board 3 in the natural state in the lateral direction, that is, the pores inside the heat insulation board 3 (aerogel) are stretched laterally, resulting in an increase in the pore gap, which brings a large error to the test. Therefore, by setting the slide plate 16 to increase the distance that the plane end 32 moves toward the center of the recessed portion 33, the degree of stretching inside the recessed portion 33 after it is formed is reduced, so as to achieve the purpose of reducing the test error.

[0040] The spring 18 is provided to provide elastic support for the left and right sides of the insulation board 3 to prevent the plane end 32 from moving laterally too fast during the movement process, resulting in the internal shrinkage of the recessed portion 33 after it is formed, and causing the pores to change, thereby increasing the test error.

[0041] The specific test steps are:

[0042] ① Such as Figure 4 , Figure 5 As shown, the heat insulation board 3 is placed on the upper end of the heating board 13 , the lower end surface of the heat insulation board 3 abuts against the end surface 132 , and the left and right sides of the heat insulation board 3 extend out of the left and right ends of the heating board 13 .

[0043] like Figure 6-Figure 9 As shown, combined with Figure 2 The pressing plate 21 moves downward and gradually presses down the heat insulation board 3. At the same time, the rods 17 on both sides instantly extend toward the side close to the heating plate 13. The slide plate 16 gradually moves toward the side close to the heating plate 13 under the action of the spring 18. Under the cooperation of the pressing plate 21 and the slide plate 16, a recessed portion 33 is formed on the heat insulation board 3.

[0044] When the concave portion 33 is concave downward, the plane end 32 moves toward the concave portion 33, the thickness of the heat insulation board 3 remains the same, and the pressing plate 21 abuts against the heat insulation board 3. The boss 213 is inserted into the groove 1 311, and the outer wall of the boss 213 abuts against the inner wall of the groove 1 311.

[0045] ② The heating plate 13 heats and transfers heat to the lower surface 35, and the lower surface 35 is heated to the test temperature. The temperature change of the upper surface 34 is recorded during the process of the lower surface 35 heating from 400 degrees to 800 degrees.

[0046] ③ The pressing plate 21 moves upward, and the friction between the outer wall of the boss 213 and the inner wall of the groove 311 causes the pressing plate 21 to pull up the recessed portion 33, and the heat insulation board 3 returns to a flat plate shape due to the rebound effect of the heat insulation board 3. At the same time, the slide plate 16 moves away from the heating plate 13.

[0047] The arrangement of the boss 213 and the groove 311 can exert an upward force on the recessed portion 33 in a bent state, so as to facilitate the separation of the recessed portion 33 from the wall of the groove body 131, thereby separating the lower surface 35 below the recessed portion 33 from the heating state. Since the insulation efficiency of the heat insulation board 3 is relatively high, the separation portion between the heat insulation board 3 and the heating plate 13 dissipates heat in the cavity 5, and the temperature of the lower surface 35 can drop to below 400°C, so that it can be heated again later.

[0048] ④ The pressing plate 21 presses down the heat insulation board 3 again and reduces the thickness of the heat insulation board 3. Specifically, the heat insulation board 3 is squeezed to one third to one half of the original thickness. Excessive squeezing will make it difficult for the heat insulation board 3 to rebound and easily damage the internal air gap structure of the heat insulation board 3. At this time, the lower end of the boss 213 is inserted into the bottom of the second groove 312. In this state, the temperature change of the upper surface 34 is recorded when the lower surface 35 is heated from 400 degrees to 800 degrees.

[0049] Since the lower end of the boss 213 is inserted into the bottom of the second groove 312, the boss 213 supports the heat insulation board 3. When the boss 213 rises back, it can pull up the heat insulation board 3 by friction, so that the heat insulation board 3 is restored to a flat state, preventing the heat insulation board 3 from being stuck in the first groove 131. And when the heat insulation board 3 is pulled up to restore to a flat state, since the contact part between the boss 213 and the heat insulation board 3 is in the middle of the heat insulation board 3, the middle part of the heat insulation board 3 shrinks more than the two sides when it is bent, and pulling it up from the middle of the heat insulation board 3 can minimize the deformation of the air gap inside the heat insulation board 3, so that multiple measurements can guarantee a certain accuracy.

[0050] ⑤Repeat the above steps to perform multiple measurements.

[0051] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A method for testing a heat insulation board, used for testing the heat insulation performance of a heat insulation board (3), characterized in that: The heat insulation board (3) is tested in a testing device, the testing device comprising a cavity (5), the heat insulation board (3) being placed in the cavity (5), the heat insulation board (3) being in the shape of a flat plate, the heat insulation board (3) comprising an upper surface (34) and a lower surface (35) located at upper and lower sides, the heat insulation board (3) being provided with groove portions (31) at both the front and rear sides, the groove portions (31) comprising a groove 1 (311) and a groove 2 (312) located below the groove 1 (311); The groove portion (31) passes through the heat insulation board (3) from top to bottom; The width of the upper end of the groove 1 (311) is greater than the width of the lower end, and the width of the lower end of the groove 1 (311) is the same as the width of the groove 2 (312); The test device also comprises a bottom plate (1), a heating plate (13) being mounted on the upper end of the bottom plate (1), the heating plate (13) being located in the cavity (5), and the upper wall surface of the heating plate (13) being able to fit with the lower surface (35); The testing device further comprises a pressing plate (21), the pressing plate (21) being capable of moving up and down, the pressing plate (21) being located above the heat insulation plate (3), and the lower wall surface of the pressing plate (21) being capable of abutting against or pressing down the upper surface (34); The testing device further comprises a slide plate (16), the slide plate (16) being located on the left and right sides of the heating plate (13), the slide plate (16) being capable of moving left and right, the slide plate (16) being provided with a second groove body (161), and the left and right sides of the heat insulation plate (3) are respectively inserted into the corresponding second groove body (161); The pressing plate (21) comprises a boss (213) located at the bottom, the boss (213) can be inserted into the groove portion (31), and the wall surface of the boss (213) can be fitted with the wall surface of the groove portion (31); The testing method comprises the following steps: ① Pressing down the heat insulation board (3) so that the heat insulation board (3) forms a recessed portion (33). In this state, the heat insulation board (3) further comprises plane ends (32) located on the left and right sides of the recessed portion (33). When the recessed portion (33) is recessed downward, the plane ends (32) move toward the recessed portion (33), and the thickness of the heat insulation board (3) remains unchanged. ② The lower surface (35) is heated to a test temperature, and the temperature change of the upper surface (34) is recorded in real time; ③ Pulling up the heat insulation board (3) to restore the heat insulation board (3) to a flat plate shape; ④ Pressing down the heat insulation board (3) again to reduce the thickness of the heat insulation board (3), in this state, heating the lower surface (35) to the test temperature, and recording the temperature change of the upper surface (34) in real time.

2. A method for testing a heat insulation board according to claim 1, characterized in that: The cavity (5) comprises an air inlet end and an air outlet end, so as to control the temperature inside the cavity (5) so that the temperature inside the cavity (5) is the same as that of the upper surface (34).

3. A method for testing a heat insulation board according to claim 1, characterized in that: The heating plate (13) comprises a groove body (131) corresponding to the recessed portion (33), and the wall surface of the groove body (131) can be fitted with the lower wall surface of the recessed portion (33).

4. A method for testing a heat insulation board according to claim 1, characterized in that: When the heat insulation board (3) is extruded, it is extruded to one third to one half of the original thickness.

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