A performance testing device for thermal insulation materials

Abstract

The present invention relates to the technical field of heat insulation material detection, and in particular to a performance testing device for thermal insulation materials, including a testing box body. A box cover is detachably installed at the upper end of the testing box body. An extrusion guiding assembly is arranged inside the testing box body. The extrusion guiding assembly includes a bearing frame fixedly installed on the rear inner side wall of the testing box body. The output end of a first electric cylinder penetrates through the bearing frame and is fixedly installed with an extrusion seat. An assembly groove is formed on the lower end surface of the extrusion seat. An elastic extrusion assembly is jointly arranged inside and outside the testing box body. The elastic extrusion assembly includes an elastic extrusion airbag movably installed inside the assembly groove. In the present invention, the extrusion of the elastic extrusion airbag on the extrusion plate expands from the middle to the left and right sides, so that the air at the contact between the thermal insulation material and the hot wire sensor can be extruded from the middle position to the outside. By optimizing the extrusion method, the air can be discharged faster, and the thermal insulation material and the hot wire sensor can reach a close contact state faster.

Description

Technical Field

[0001] The present invention relates to the technical field of heat insulation material detection, and particularly relates to a performance testing device for thermal insulation materials. Background Art

[0002] Thermal insulation materials refer to materials that can effectively impede the transfer of heat flow, including heat insulation materials for keeping heat from escaping and heat insulation materials for preventing external heat from entering. The excellent function of impeding heat flow transfer can meet the thermal environment requirements of building spaces or thermal equipment, and at the same time greatly save energy.

[0003] The thermal conductivity is an important indicator for measuring the thermal insulation performance of thermal insulation materials. The smaller the thermal conductivity, the better the thermal insulation performance of the material. When measuring the thermal conductivity of thermal insulation materials, the hot wire method is usually used for testing. The performance testing device for thermal insulation materials generally consists of a hot wire probe, a power supply, a control unit, a data acquisition and processing system, etc.; the hot wire probe includes a hot wire and a temperature sensor. The hot wire is used to generate heat and exchange heat with the material to be measured, and the temperature sensor is used to measure the temperature change of the hot wire. The power supply and the control unit provide a constant current or voltage to the hot wire and control the measurement process. The data acquisition and processing system collects the signals of the hot wire probe and calculates the thermal conductivity of the material.

[0004] In the existing technical solutions, the hot wire is embedded or placed in the material to be measured. The heat exchange between the hot wire and the material will cause the temperature change of the hot wire. By measuring the resistance change of the hot wire, the temperature change of the hot wire can be calculated, and thus the thermal conductivity of the material can be obtained. However, when the hot wire is embedded or placed in the material to be measured, if there is poor contact or voids, the heat transfer will be blocked, thus affecting the measurement of the thermal conductivity. Summary of the Invention

[0005] The purpose of the present invention is to provide a performance testing device for thermal insulation materials. The elastic extrusion airbag squeezes the extrusion plate, and the extrusion extends from the middle to the left and right sides. In this way, the air at the contact between the thermal insulation material and the hot wire sensor can be extruded from the middle position to the outside. By optimizing the extrusion method, the air can be discharged faster, and the thermal insulation material and the hot wire sensor can reach a close contact state faster, so as to solve the problems proposed in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A performance testing device for thermal insulation materials, including a test box body, the upper end of the test box body is detachably installed with a box cover, and an extrusion guiding component is arranged inside the test box body. The extrusion guiding component includes a bearing frame fixedly installed on the rear side wall inside the test box body. The upper end of the bearing frame is fixedly installed with a first electric cylinder, and the output end of the first electric cylinder penetrates through the bearing frame and is fixedly installed with an extrusion seat. An assembly groove is opened on the lower end surface of the extrusion seat.

[0007] An elastic extrusion assembly is provided both inside and outside the test box body. The elastic extrusion assembly includes an elastic extrusion airbag movably installed inside the assembly groove. Storage grooves corresponding to the elastic extrusion airbag are formed on the left and right side walls inside the extrusion seat. A first spring is fixedly installed inside the storage groove, and one end of the first spring away from the storage groove is fixedly connected to a top plate.

[0008] Preferably, the elastic extrusion assembly further includes an air pump fixedly installed on the right side wall of the test box body. The output end of the air pump is fixedly communicated with an air guide pipe. The air guide pipe is embedded in the inner wall of the test box body and its end is communicated with the elastic extrusion airbag.

[0009] Preferably, the extrusion guiding assembly includes an extrusion plate slidably installed at the lower end inside the assembly groove. Positioning seats are fixedly installed at both left and right ends of the upper end surface of the extrusion plate.

[0010] Preferably, a test seat is fixedly installed at the middle position inside the test box body. Shrinkage grooves are formed at the four corners of the upper end surface of the test seat and the four corners of the lower end surface of the extrusion seat. A second spring is movably installed inside the shrinkage groove, and one end of the second spring away from the shrinkage groove is fixedly connected to a positioning assembly rod.

[0011] Preferably, a sealing and pressing assembly is provided at the connection between the test box body and the box cover. The sealing and pressing assembly includes an assembly card slot formed at the edge of the upper end surface of the test box body, and a snap ring fixedly installed at the edge of the lower end surface of the box cover and matching with the assembly card slot.

[0012] Preferably, a sealing air guide pipe is embedded on the side wall of the assembly card slot close to the inside of the test box body, and the sealing air guide pipe is communicated with the air guide pipe.

[0013] Preferably, a communication valve pipe is fixedly communicated with the pipe wall of the sealing air guide pipe close to the inside of the test box body. The communication valve pipe penetrates through the inner wall of the test box body and extends to the inside of the test box body, and the communication valve pipe is arranged obliquely downward.

[0014] Preferably, a test matching assembly is provided on the left side inside the test box body. The test matching assembly includes a second electric cylinder fixedly installed on the left inner wall of the test box body. The telescopic end of the second electric cylinder is fixedly connected to a loading rack, and a hot wire sensor is fixedly installed at the right end of the loading rack.

[0015] Preferably, a temperature reduction and cleaning assembly is provided above the test matching assembly on the left side inside the test box body. The temperature reduction and cleaning assembly includes an air delivery pipe embedded in the left inner wall of the test box body, and the output end of the air delivery pipe is fixedly communicated with a control valve pipe.

[0016] Preferably, a communicating pipe is fixedly installed at the right end of the control valve pipe, and air injection holes corresponding to the hot wire sensor are formed in the pipe wall of the communicating pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. Through the elastic expansion of the elastic extrusion airbag of the present invention, the extrusion plate inside the assembly groove can be elastically extruded, so that the extrusion plate can elastically extrude the thermal insulation material. After the thermal insulation material is elastically extruded, the voids and bubbles inside it will be compressed, making the material more compact. This helps to reduce the thermal bridge effect and heat dissipation inside the material, thereby improving the accuracy of the test; during the test, the thermal insulation material may deform due to temperature changes or external forces. Through the extrusion of the elastic extrusion airbag, the stability of the material can be maintained, preventing it from affecting the test results due to deformation. This stability is crucial for accurately measuring the thermal conductivity of the material.

[0019] 2. The extrusion of the elastic extrusion airbag on the extrusion plate of the present invention expands from the middle to the left and right sides, so that the air at the contact between the thermal insulation material and the hot wire sensor can be extruded from the middle position to the outside. The extrusion expanding from the middle to both sides can ensure that the contact between the thermal insulation material and the hot wire sensor is closer, reducing the air gap between the two. When the air is extruded from the middle position to the outside, the thermal bridge effect of the air between the thermal insulation material and the hot wire sensor is reduced, and the heat dissipation is lowered; by optimizing the extrusion method, the air can be discharged faster, enabling the thermal insulation material and the hot wire sensor to reach a close contact state faster.

[0020] 3. Through the expansion of the sealing air duct of the present invention, the end face of the sealing air duct can be made to fit with the end face of the snap ring, which can further ensure the tightness of the connection between the snap ring and the assembly card slot, effectively preventing external air or heat from entering the test area through these gaps. Good sealing is the basis for the accuracy of the hot wire method test and can avoid external factors from interfering with the test results.

[0021] 4. The gas can be sprayed onto the corresponding hot wire sensor through the air injection holes on the communicating pipe. After long-term operation, the hot wire sensor may cause measurement errors due to heat accumulation or contamination; the gas sprayed through the air injection holes can quickly cool the hot wire sensor, eliminating the errors caused by heat accumulation; at the same time, the cleaning treatment can remove the contaminants on the sensor surface, ensuring the cleanliness of the sensor surface, thereby improving the accuracy and precision of the test. Description of the Drawings

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is the overall structural view of the present invention;

[0024] Figure 2 It is the schematic diagram of the internal structure of the test box body of the present invention;

[0025] Figure 3 It is the schematic diagram of the bottom end face structure of the box cover of the present invention;

[0026] Figure 4 It is the schematic diagram of the half-sectional internal structure of the test box body of the present invention;

[0027] Figure 5 It is the schematic diagram of the connection structure between the sealing air duct and the cooling and cleaning assembly of the present invention;

[0028] Figure 6 It is the schematic diagram of the extrusion guiding assembly of the present invention;

[0029] Figure 7 It is the schematic diagram of the elastic extrusion assembly of the present invention.

[0030] Explanation of reference numerals:

[0031] 1. Test box body; 2. Box cover; 3. Elastic extrusion assembly; 301. Air pump; 302. Air duct; 303. Elastic extrusion airbag; 304. Top plate; 305. First spring; 306. Storage groove; 4. Extrusion guiding assembly; 401. Carrier; 402. First electric cylinder; 403. Extrusion seat; 404. Assembly groove; 405. Positioning seat; 406. Extrusion plate; 407. Test seat; 408. Shrinkage groove; 409. Second spring; 410. Positioning assembly rod; 5. Sealing and pressing assembly; 501. Sealing air duct; 502. Assembly card slot; 503. Snap ring; 6. Connecting valve pipe; 7. Cooling and cleaning assembly; 701. Air delivery pipe; 702. Control valve pipe; 703. Connecting pipe; 704. Air injection hole; 8. Test matching assembly; 801. Second electric cylinder; 802. Loading rack; 803. Hot wire sensor. Specific embodiments

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] The present invention provides a technical solution:

[0034] Please refer to Figure 1 、 Figure 2 、 Figures 5 to 7 a performance testing device for thermal insulation materials, including a test box body 1, a box cover 2 is detachably installed at the upper end of the test box body 1, a test matching component 8 is arranged on the left side inside the test box body 1, an extrusion guiding component 4 is arranged inside the test box body 1, the extrusion guiding component 4 includes a bearing frame 401 fixedly installed on the rear inner side wall of the test box body 1, a first electric cylinder 402 is fixedly installed at the upper end of the bearing frame 401, the output end of the first electric cylinder 402 penetrates through the bearing frame 401 and is fixedly installed with an extrusion seat 403, an assembly groove 404 is opened on the lower end surface of the extrusion seat 403, the extrusion guiding component 4 includes an extrusion plate 406 slidably installed at the lower end inside the assembly groove 404, positioning seats 405 are fixedly installed at the left and right ends of the upper end surface of the extrusion plate 406, a test seat 407 is fixedly installed at the middle position inside the test box body 1, shrinkage grooves 408 are opened at the four corners of the upper end surface of the test seat 407 and the four corners of the lower end surface of the extrusion seat 403, a second spring 409 is movably installed inside the shrinkage groove 408, and one end of the second spring 409 away from the shrinkage groove 408 is fixedly connected with a positioning and assembling rod 410;

[0035] An elastic extrusion component 3 is jointly arranged inside and outside the test box body 1, the elastic extrusion component 3 includes an elastic extrusion airbag 303 movably installed inside the assembly groove 404, storage grooves 306 corresponding to the elastic extrusion airbag 303 are opened on the left and right side walls inside the extrusion seat 403, a first spring 305 is fixedly installed inside the storage groove 306, one end of the first spring 305 away from the storage groove 306 is fixedly connected with a top plate 304, the elastic extrusion component 3 further includes an air pump 301 fixedly installed on the right side wall of the test box body 1, the output end of the air pump 301 is fixedly communicated with an air guide pipe 302, and the air guide pipe 302 is embedded in the inner wall of the test box body 1 and the end is mutually communicated with the elastic extrusion airbag 303.

[0036] By adopting the above technical solution, during use, first open the box cover 2 through the handle, so that it is convenient to place the thermal insulation material to be tested in the test box body 1 for testing. First, the uniformity of the sample of the thermal insulation material itself needs to be ensured. Before testing, two identical samples of the thermal insulation material should be fully processed and prepared. When conducting the thermal conductivity performance test, place one of the thermal insulation materials on the test seat 407, align the positioning holes opened on the thermal insulation material with the positioning assembly rods 410 on the test seat 407, and place the thermal insulation material on the test seat 407. At this time, push the hot wire sensor 803 of the test matching component 8 to the middle position of the thermal insulation material. It should be noted here that when the thermal insulation material is being processed for sample uniformity, the size of the sample after processing should be such that after being placed on the test seat 407, the upper end surface of the material is on the same horizontal plane as the hot wire sensor 803; after one of the thermal insulation materials is placed on the test seat 407, place the other thermal insulation material on the positioning seat 405, and align the positioning holes opened on the thermal insulation material with the positioning assembly rods 410 on the positioning seat 405, so that the thermal insulation material can be placed on the positioning seat 405. It should be noted here that when the thermal insulation material is placed, the friction force between itself and the positioning assembly rods 410 on the positioning seat 405 is greater than the gravity of the thermal insulation material itself, so as to ensure that the thermal insulation material is stably placed on the positioning seat 405. The positioning assembly rods 410 ensure the mutual alignment of the two thermal insulation materials during testing, thus eliminating the test error caused by the position deviation of the materials. This precise alignment helps to obtain more accurate test results and makes the test data more reliable; when testing the performance of the material multiple times, the positioning assembly rods 410 can ensure that the conditions and settings for each test remain consistent, which helps to establish comparability between different tests, thereby more accurately evaluating the performance differences of the materials; through the positioning process by the positioning assembly rods 410, the adjustment and calibration steps during the test can be reduced.

[0037] After both heat-insulating materials are placed, start the first electric cylinder 402 on the carrier 401. The provided carrier 401 can provide stable support for the first electric cylinder 402. When the first electric cylinder 402 operates, it can push the positioning seat 405 downward, so that the pressing plate 406 on the lower end face of the positioning seat 405 can press the heat-insulating materials placed on the test seat 407, thereby making the contact between the two heat-insulating materials and the hot-wire sensor 803 closer. When the heat-insulating materials are in close contact with the hot-wire sensor 803, the accuracy and consistency of the heat transfer path can be ensured, thus improving the test accuracy; close contact can reduce losses and interference during the heat transfer process, making the test results closer to the true value; the closely contacted heat-insulating materials can reduce test errors caused by voids or misalignments between materials, which helps improve the reliability of the test and makes the test results more stable and repeatable; fixing the heat-insulating materials through the pressing plate 406 can ensure more efficient heat transfer between the materials, which helps reach a stable state faster during the test, thereby shortening the test time and improving the test efficiency. During the pressing process, the provided positioning and assembly rod 410 can perform elastic telescopic movement in the storage groove 306 through the second spring 409. This setting can prevent the positioning and assembly rod 410 from affecting the pressing during extrusion.

[0038] After the extrusion is completed through the preliminary cooperation between the positioning seat 405 and the test seat 407, cover the box cover 2 on the test box body 1. Start the air pump 301. When the air pump 301 operates, it can introduce external air into the air guide pipe 302. Through the air guide pipe 302, the air can be introduced into the elastic extrusion airbag 303. Through the elastic expansion of the elastic extrusion airbag 303, the pressing plate 406 inside the assembly groove 404 can be elastically pressed, so that the pressing plate 406 can elastically press the heat-insulating materials. After the heat-insulating materials are elastically pressed, the voids and bubbles inside them will be compressed, making the materials more compact. This helps reduce the thermal bridge effect and heat dissipation inside the materials, thereby improving the test accuracy. By ensuring good contact between the materials and the hot-wire sensor 803, errors during the test can be reduced, making the test results more reliable; during the test, the heat-insulating materials may deform due to temperature changes or external forces. Through the extrusion of the elastic extrusion airbag 303, the stability of the materials can be maintained, preventing them from affecting the test results due to deformation. This stability is crucial for accurately measuring the thermal conductivity of the materials; different heat-insulating materials have different physical properties and structural characteristics. By adjusting the expansion degree of the elastic extrusion airbag 303 and the pressure of the pressing plate 406, the test requirements for different materials can be met. This flexibility enables the hot-wire method test to be widely applied to the thermal conductivity test of various heat-insulating materials.

[0039] When the elastic extrusion airbag 303 expands elastically, the expanded elastic extrusion airbag 303 first squeezes the middle position of the extrusion plate 406. At the same time, through the continuous elastic expansion of the elastic extrusion airbag 303, the elastic extrusion airbag 303 can squeeze the top plates 304 on both sides. In this way, under the action of the elastic extrusion airbag 303, the top plates 304 move to the side away from the elastic extrusion airbag 303. The movement of the top plates 304 can squeeze the first springs 305, so that the first springs 305 contract into the contraction grooves 408. In this way, the extrusion of the elastic extrusion airbag 303 on the extrusion plate 406 expands from the middle to the left and right sides, so that the air at the contact between the heat-insulating material and the hot-wire sensor 803 is extruded from the middle position to the outside. The extrusion expands from the middle to both sides, which can ensure closer contact between the heat-insulating material and the hot-wire sensor 803, reduce the air gap between the two. When the air is extruded from the middle position to the outside, the heat bridge effect of the air between the heat-insulating material and the hot-wire sensor 803 is reduced, and the heat dissipation is reduced; by optimizing the extrusion method, the air can be discharged faster, and the heat-insulating material and the hot-wire sensor 803 can reach the close contact state faster.

[0040] Specifically, as Figures 2 to 3 shown, a sealing and pressing assembly 5 is provided at the connection between the test box body 1 and the box cover 2. The sealing and pressing assembly 5 includes an assembly card slot 502 opened at the edge of the upper end surface of the test box body 1. A retaining ring 503 that matches the assembly card slot 502 is fixedly installed at the edge of the lower end surface of the box cover 2. A sealing air duct 501 is embedded on the side wall of the assembly card slot 502 close to the inside of the test box body 1. The sealing air duct 501 is communicated with the air duct 302. A communicating valve pipe 6 is fixedly communicated with the pipe wall of the sealing air duct 501 close to the inside of the test box body 1. The communicating valve pipe 6 penetrates the inner wall of the test box body 1 and extends into the test box body 1. The communicating valve pipe 6 is arranged obliquely downward.

[0041] By adopting the above technical solution, when the lid 2 is covered on the test box body 1, the snap ring 503 will be snapped into the assembly slot 502, thereby ensuring the sealing performance of the connection between the lid 2 and the test box body 1. When the air pump 301 works, the air duct 302 and the sealed air duct 501 are interconnected, so that the air in the air duct 302 can be introduced into the sealed air duct 501. At this time, through the expansion of the sealed air duct 501, the end face of the sealed air duct 501 can be made to fit with the end face of the snap ring 503, which can further ensure the tightness of the connection between the snap ring 503 and the assembly slot 502, effectively preventing external air or heat from entering the test area through these gaps. Good sealing performance is the basis for the accuracy of the hot wire method test, which can avoid external factors interfering with the test results; the enhancement of the sealing performance helps to maintain the stability of the temperature and heat distribution inside the test box body 1, reduce heat dissipation during the test, and a stable test environment can ensure more accurate heat transfer between the hot wire sensor 803 and the thermal insulation material, thereby improving the accuracy of the test results.

[0042] When the test is over, through the connection between the sealed air duct 501 and the connecting valve pipe 6, the gas inside the sealed air duct 501 can be sprayed into the test box body 1 through the connecting valve pipe 6. By spraying a large amount of gas into the test box body 1, the hot air generated inside the test box body 1 during the test can be extruded, thereby realizing the exchange of the air inside the test box body 1. Through the rapid exchange of the air inside the test box body 1, the environment inside the test box body 1 can be in a normal temperature state, which can facilitate and quickly carry out the next performance test experiment; by quickly exchanging the air inside the test box body 1, the preparation time between tests can be shortened, making the test process more efficient, which helps to save test costs and time and improve test efficiency. The thermal conductivity test of the thermal insulation material is relatively sensitive to the ambient temperature. By quickly exchanging the air inside the test box body 1, the stability and consistency of the test environment temperature can be ensured, thereby improving the accuracy and reliability of the test.

[0043] Specifically, as Figures 3 to 5 shown, the test matching component 8 includes a second electric cylinder 801 fixedly installed on the left inner wall of the test box body 1. The telescopic end of the second electric cylinder 801 is fixedly connected with a loading rack 802. The right end of the loading rack 802 is fixedly installed with a hot wire sensor 803. A cooling and cleaning component 7 is arranged above the test matching component 8 on the left side inside the test box body 1. The cooling and cleaning component 7 includes an air delivery pipe 701 embedded in the left inner wall of the test box body 1. The output end of the air delivery pipe 701 is fixedly communicated with a control valve pipe 702. The right end of the control valve pipe 702 is fixedly installed with a connecting pipe 703. The pipe wall of the connecting pipe 703 is provided with air injection holes 704 corresponding to the hot wire sensor 803.

[0044] By adopting the above technical solution, after the thermal insulation material is placed on the test seat 407, the second electric cylinder 801 is started. The operation of the second electric cylinder 801 can drive the loading rack 802 to expand and contract. The loading rack 802 can drive the hot wire sensor 803 to move and expand and contract. When measuring the thermal conductivity, the hot wire sensor 803 is pushed to the middle position of the thermal insulation material to ensure the accuracy of the position placement during the thermal conductivity measurement. After the test is completed, the second electric cylinder 801 can drive the loading rack 802 to contract, so that the hot wire sensor 803 returns to the initial position. When the hot wire sensor 803 returns to the initial position, the control valve pipe 702 is opened, and the gas transmission pipe 701 and the sealed air guide pipe 501 are communicated with each other. In this way, the gas inside the gas transmission pipe 701 can be transported to the connecting pipe 703 through the control valve pipe 702. The gas can be sprayed onto the corresponding hot wire sensor 803 through the air spraying holes 704 on the connecting pipe 703. The hot wire sensor 803 may cause measurement errors due to heat accumulation or contamination after long-term operation. The gas sprayed through the air spraying holes 704 can quickly cool down the hot wire sensor 803, eliminating the errors caused by heat accumulation. At the same time, the cleaning treatment can remove the pollutants on the surface of the sensor, ensuring the cleanliness of the sensor surface, thereby improving the accuracy and precision of the test.

[0045] Working principle: The thermal insulation material performance testing device also includes a power supply, a control unit, a data acquisition and processing system, etc. The power supply and the control unit provide a constant current or voltage for the hot wire and control the measurement process; the data acquisition and processing system collects the signals of the hot wire probe and calculates the thermal conductivity of the material. The above is the prior art solution and will not be elaborated in detail here. When in use, first open the box cover 2 through the handle, so as to facilitate placing the thermal insulation material to be tested in the test box body 1 for testing. First, it is necessary to ensure the uniformity of the sample of the thermal insulation material itself. Before the test, two identical samples of the thermal insulation material should be fully processed and prepared. When performing the thermal conductivity performance detection, place one of the thermal insulation materials on the test seat 407, align the positioning holes opened on the thermal insulation material with the positioning assembly rods 410 on the test seat 407, place the thermal insulation material on the test seat 407, start the second electric cylinder 801, and the operation of the second electric cylinder 801 can drive the loading frame 802 to expand and contract. The hot wire sensor 803 can be driven to move and expand and contract through the loading frame 802. When performing the thermal conductivity test, push the hot wire sensor 803 to the middle position of the thermal insulation material to ensure the accuracy of the position placement during the thermal conductivity test. After one of the thermal insulation materials is placed on the test seat 407, place the other thermal insulation material on the positioning seat 405, and align the positioning holes opened on the thermal insulation material with the positioning assembly rods 410 on the positioning seat 405, so that the thermal insulation material can be placed on the positioning seat 405. After both thermal insulation materials are placed, start the first electric cylinder 402 on the bearing frame 401. The provided bearing frame 401 can provide stable support for the first electric cylinder 402. The operation of the first electric cylinder 402 can push the positioning seat 405 downward, so that the pressing plate 406 on the lower end face of the positioning seat 405 can press the thermal insulation material placed on the test seat 407. During the pressing process, the provided positioning assembly rod 410 can elastically expand and contract in the contraction groove 408 through the second spring 409. Such a setting can avoid the influence of the positioning assembly rod 410 on the pressing during the pressing process.

[0046] After the positioning seat 405 and the test seat 407 are initially fitted and extruded, cover the box cover 2 on the test box body 1. When covering the box cover 2 on the test box body 1, the snap ring 503 will be snapped into the assembly card slot 502 to ensure the sealing of the connection between the box cover 2 and the test box body 1. Start the air pump 301. The operation of the air pump 301 can introduce external air into the air duct 302. The air duct 302 is interconnected with the sealed air duct 501, so that the air in the air duct 302 can be introduced into the sealed air duct 501. At this time, through the expansion of the sealed air duct 501, the end face of the sealed air duct 501 can be made to fit with the end face of the snap ring 503, which can further ensure the tightness of the connection between the snap ring 503 and the assembly card slot 502; the air can be introduced into the elastic extrusion airbag 303 through the air duct 302. Through the elastic expansion of the elastic extrusion airbag 303, the extrusion plate 406 inside the assembly groove 404 can be elastically extruded, so that the extrusion plate 406 can elastically extrude the heat-insulating material; when the elastic extrusion airbag 303 is elastically expanding, the expanding elastic extrusion airbag 303 will first extrude the middle position of the extrusion plate 406. At the same time, through the continuous elastic expansion of the elastic extrusion airbag 303, the elastic extrusion airbag 303 can extrude the top plates 304 on both sides, so that the top plates 304 can move to the side away from the elastic extrusion airbag 303 under the action of the elastic extrusion airbag 303. The movement of the top plates 304 can extrude the first spring 305, so that the first spring 305 can be contracted into the contraction groove 408, and the extrusion of the elastic extrusion airbag 303 on the extrusion plate 406 can expand from the middle to the left and right sides, so that the air at the contact between the heat-insulating material and the hot wire sensor 803 can be extruded from the middle position to the outside. The extrusion expands from the middle to both sides, which can ensure that the contact between the heat-insulating material and the hot wire sensor 803 is closer.

[0047] After the extrusion is fixed, the power supply and the control unit provide a constant current or voltage to the hot-wire sensor 803 and control the measurement process; the data acquisition and processing system collects the signals of the hot-wire probe and calculates the thermal conductivity of the material, thereby completing the test of the thermal conductivity of the thermal insulation material; when the test of the thermal conductivity is completed, the air pump 301 is turned off, and the operation of the first electric cylinder 402 can separate the positioning seat 405, the extrusion plate 406 from the test seat 407, and then the thermal insulation material can be separated. At this time, the second electric cylinder 801 can drive the loading rack 802 to contract, so that the hot-wire sensor 803 returns to its initial position. Open the box cover 2 through the handle, start the air pump 301 again, the air pump 301 supplies gas to the sealed air duct 501, and through the connection between the sealed air duct 501 and the connecting valve pipe 6, the gas inside the sealed air duct 501 can be sprayed into the test box body 1 through the connecting valve pipe 6. By spraying a large amount of gas into the test box body 1, the hot air generated inside the test box body 1 during the test can be extruded, thereby realizing the exchange of the air inside the test box body 1. Through the rapid exchange of the air inside the test box body 1, the environment inside the test box body 1 can be in a normal temperature state, which can facilitate and quickly conduct the next performance test experiment. Open the control valve pipe 702, and the gas pipeline 701 and the sealed air duct 501 are interconnected, so that the gas inside the gas pipeline 701 can be transported to the connecting pipe 703 through the control valve pipe 702, and the gas can be sprayed onto the corresponding hot-wire sensor 803 through the air spraying holes 704 on the connecting pipe 703. The hot-wire sensor 803 may cause measurement errors due to heat accumulation or contamination after long-term operation; the gas sprayed through the air spraying holes 704 can quickly cool down the hot-wire sensor 803, and the error caused by heat accumulation can be eliminated; at the same time, the cleaning treatment can remove the contaminants on the surface of the sensor, ensure the cleanliness of the sensor surface, and thus improve the accuracy and precision of the test.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A performance testing device for thermal insulation materials, comprising a test box body (1), characterized in that: A lid (2) is detachably installed at the upper end of the test box body (1). An extrusion guiding component (4) is arranged inside the test box body (1). The extrusion guiding component (4) includes a bearing frame (401) fixedly installed on the rear inner wall of the test box body (1). A first electric cylinder (402) is fixedly installed at the upper end of the bearing frame (401). The output end of the first electric cylinder (402) penetrates through the bearing frame (401) and is fixedly installed with an extrusion seat (403). An assembly groove (404) is formed on the lower end face of the extrusion seat (403). An elastic extrusion component (3) is jointly arranged inside and outside the test box body (1). The elastic extrusion component (3) includes an elastic extrusion airbag (303) movably installed inside the assembly groove (404). Storage grooves (306) corresponding to the elastic extrusion airbag (303) are formed on the left and right inner side walls inside the extrusion seat (403). A first spring (305) is fixedly installed inside the storage groove (306). One end of the first spring (305) far away from the storage groove (306) is fixedly connected with a top plate (304). The extrusion guiding component (4) includes an extrusion plate (406) slidably installed at the lower end inside the assembly groove (404). Positioning seats (405) are fixedly installed at both left and right ends of the upper end face of the extrusion plate (406). A test seat (407) is fixedly installed at the middle position inside the test box body (1). Shrinkage grooves (408) are formed at the four corners of the upper end face of the test seat (407) and the four corners of the lower end face of the extrusion seat (403). A second spring (409) is movably installed inside the shrinkage groove (408). One end of the second spring (409) far away from the shrinkage groove (408) is fixedly connected with a positioning assembly rod (410). A test matching component (8) is arranged on the left side inside the test box body (1). The test matching component (8) includes a second electric cylinder (801) fixedly installed on the left inner wall of the test box body (1). The telescopic end of the second electric cylinder (801) is fixedly connected with a loading rack (802). A hot wire sensor (803) is fixedly installed at the right end of the loading rack (802).

2. The performance testing device for a thermal insulation material according to claim 1, wherein: The elastic extrusion component (3) further includes an air pump (301) fixedly installed on the right side wall of the test box body (1). The output end of the air pump (301) is fixedly communicated with an air guide pipe (302). The air guide pipe (302) is embedded in the inner wall of the test box body (1) and the end is communicated with the elastic extrusion airbag (303).

3. The performance testing device for a thermal insulation material according to claim 1, characterized in that: A sealing and pressing component (5) is arranged at the connection between the test box body (1) and the lid (2). The sealing and pressing component (5) includes an assembly card slot (502) formed at the edge of the upper end face of the test box body (1). A clamping ring (503) mutually matching with the assembly card slot (502) is fixedly installed at the edge of the lower end face of the lid (2).

4. The performance testing device for a thermal insulation material according to claim 3, wherein: A sealing air guide pipe (501) is embedded on the side wall of the assembly card slot (502) close to the inside of the test box body (1). The sealing air guide pipe (501) is communicated with the air guide pipe (302).

5. The performance testing device for a thermal insulation material according to claim 4, characterized in that: A communication valve pipe (6) is fixedly communicated with the pipe wall of the sealed air duct (501) close to the inside of the test box body (1). The communication valve pipe (6) penetrates through the inner wall of the test box body (1) and extends into the test box body (1), and the communication valve pipe (6) is arranged obliquely downward.

6. The performance testing device for a thermal insulation material according to claim 1, characterized in that: A cooling and cleaning assembly (7) is arranged above the test matching assembly (8) on the left side inside the test box body (1). The cooling and cleaning assembly (7) includes an air duct (701) embedded in the left inner wall of the test box body (1), and the output end of the air duct (701) is fixedly communicated with a control valve pipe (702).

7. The performance testing device for a heat-insulating material according to claim 6, wherein: A communication pipe (703) is fixedly installed at the right end of the control valve pipe (702), and air jet holes (704) corresponding to the hot wire sensor (803) are formed in the pipe wall of the communication pipe (703).

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