阅读说明：本技术 固体介质热传导性能测量方法 (Method for measuring heat conduction performance of solid medium ) 是由 朱光俊 张倩影 朱礼龙 徐屾 于 2019-09-24 设计创作，主要内容包括：本发明公开一种固体介质热传导性能测量方法,首先准备箱体,在所述箱体的顶部开设投料口,并在所述箱体内间隔设置发热源和第一感温模块,将所述发热源和第一感温模块分别固定安装在所述箱体的内侧壁；其次在室温条件下,将所述发热源加热至目标温度并保持,在预定时间内将待测材料从所述投料口投入所述箱体内,使待测材料充满箱体；最后连续获取并记录所述第一感温模块测得的温度数据,直到所述第一感温模块测得的温度稳定,绘制温度-时间曲线。采用本发明的显著效果是,能对材料的导热效果进行简单、快速的测定、分析,从而大致量化得到材料的导热性能,成本更低、经济性更好。(The invention discloses a method for measuring the heat conduction performance of a solid medium, which comprises the steps of firstly preparing a box body, arranging a feed opening at the top of the box body, arranging a heating source and a first temperature sensing module in the box body at intervals, and respectively and fixedly installing the heating source and the first temperature sensing module on the inner side wall of the box body; secondly, heating the heating source to a target temperature and keeping the heating source at the room temperature, and throwing the material to be tested into the box body from the feeding port within preset time to fill the box body with the material to be tested; and finally, continuously acquiring and recording the temperature data measured by the first temperature sensing module until the temperature measured by the first temperature sensing module is stable, and drawing a temperature-time curve. The invention has the obvious effects that the heat conduction effect of the material can be simply and quickly measured and analyzed, so that the heat conduction performance of the material is roughly obtained in a quantitative manner, the cost is lower, and the economy is better.)

1. A method for measuring the heat conduction performance of a solid medium is characterized by comprising the following steps:

firstly, preparing a box body (a), arranging a feeding port at the top of the box body (a), arranging a heating source (1) and a first temperature sensing module (2) in the box body (a) at intervals, and respectively and fixedly installing the heating source (1) and the first temperature sensing module (2) on the inner side wall of the box body (a);

step two, heating the heating source (1) to a target temperature and keeping the temperature at room temperature, and throwing the material to be measured into the box body (a) from the feeding port within a preset time to fill the box body (a) with the material to be measured;

and step three, continuously acquiring and recording temperature data measured by the first temperature sensing module (2) by taking the time when the material to be measured starts to be added as an initial time until the temperature measured by the first temperature sensing module (2) is stable, and drawing a temperature-time curve.

2. The solid medium heat transfer performance measurement method of claim 1, wherein: after the first step is finished, the material to be tested and the box body (a) are stored for at least 24 hours at room temperature, and then the second step is carried out.

3. The solid medium heat transfer performance measurement method of claim 1, wherein: and in the third step, the temperature data measured by the first temperature sensing module (2) is acquired at the same time interval.

4. The method for measuring the heat transfer performance of the solid medium according to claim 1, 2 or 3, further comprising the step four of: and fitting the slope of the temperature-time curve through linear regression to quantify the heat conduction performance of the material to be tested.

5. The method for measuring the heat transfer performance of a solid medium according to claim 1, 2 or 3, further comprising the step of: and (c) cleaning the box body (a), repeating the second step, the third step and the fourth step, and quantitatively comparing the heat conduction performance of different materials to be tested.

6. A solid medium heat transfer performance measurement method according to claim 1, 2 or 3, characterized in that: the heat source (1) comprises a spherical heat-conducting shell (11), a hollow cavity (1a) is arranged in the heat-conducting shell (11), a support hole (11a) penetrates through the wall of the heat-conducting shell (11), a support rod (12) penetrates through the support hole (11a), the outer end of the support rod (12) extends out of the heat-conducting shell (11), the inner end of the support rod (12) extends into the hollow cavity (1a) and is connected with a heating component (13), and a gap is formed between the heating component (13) and the inner wall of the heat-conducting shell (11);

the heat conduction shell (11) comprises two hemispherical shells (111), and the two hemispherical shells (111) are buckled with each other;

two pairs of snap rings (112) are integrally formed on the annular end surfaces of the two hemispherical shells (111), wherein one snap ring (112) is positioned on the inner ring edge of the corresponding annular end surface, so that an inner snap ring is formed; the other snap ring pair (112) is positioned at the outer ring edge of the corresponding annular end surface, so as to form an outer snap ring;

the outer wall of the inner retaining ring is abutted against the inner wall of the outer retaining ring, a circle of buckling limiting ring (114) is arranged on the inner wall of the outer retaining ring in the circumferential direction, a circle of buckling limiting groove is arranged on the outer wall of the inner retaining ring in the corresponding circumferential direction, and the buckling limiting ring (114) falls into the buckling limiting groove;

the outer end face of the pair of snap rings (112) is tightly abutted against the annular end face of the other semispherical shell (111), the outer end face of the pair of snap rings (112) and the annular end face abutted against the outer end face are simultaneously provided with annular sealing ring grooves, and sealing rings (113) are arranged in the sealing ring grooves;

buckling notches are respectively arranged at the edges of the two hemispherical shells (111), and the buckling notches of the two hemispherical shells are correspondingly arranged to form the support hole (11 a);

the supporting rod (12) comprises a supporting rod body (121), the supporting rod body (121) penetrates through the supporting hole (11a) along the diameter direction of the heat-conducting shell (11), a limiting ring (122) is fixed in the middle of the supporting rod body (121), the limiting ring (122) is located in the heat-conducting shell (11), a spherical abutting surface matched with the inner wall of the heat-conducting shell (11) is arranged on the limiting ring (122), an inner-side sealing gasket (123) is sleeved on the supporting rod body (121) on the outer side of the limiting ring (122), and the spherical abutting surface presses the inner-side sealing gasket (123) on the inner wall of the heat-conducting shell (11);

the utility model discloses a heat conduction device, including vaulting pole body (121) go up the thread bush and be equipped with lock nut (124), this lock nut (124) are located outside heat conduction shell (11), this lock nut (124) with between heat conduction shell (11) the cover is equipped with outside seal ring (125) on vaulting pole body (121), lock nut (124) will outside seal ring (125) compress tightly the outer wall of heat conduction shell (11).

7. The solid medium heat transfer performance measurement method of claim 6, wherein: the heating assembly (13) comprises a winding bracket (131), the winding bracket (131) is connected with the inner end of the stay bar body (121), a winding seat (132) is arranged on the winding bracket (131), an electric heating wire (133) is wound on the winding seat (132), two ends of the electric heating wire (133) are respectively connected with a heating power line (14), and the heating power line (14) penetrates out of the heat conduction shell (11);

the winding bracket (131) comprises a supporting rod (131a), the supporting rod (131a) is perpendicular to the supporting rod body (121), the middle of the supporting rod (131a) is fixedly connected with the inner end of the supporting rod body (121), elastic clamping pieces (131b) are respectively fixed at two ends of the supporting rod (131a), the winding seat (132) is arranged between the elastic clamping pieces (131b) at two ends of the supporting rod (131a), the winding seat (132) is cylindrical, two ends of the winding seat (132) are respectively abutted against the elastic clamping pieces (131b), a threaded winding groove is formed in the outer wall of the winding seat (132), and the electric heating wire (133) is wound in the winding groove;

limiting depressions are respectively formed in the end faces of two ends of the winding seat (132), limiting chucks (131c) are respectively arranged on the elastic clamping piece (131b) corresponding to the limiting depressions, and the limiting chucks (131c) fall into the corresponding limiting depressions;

two power line limiting holes are formed in the supporting rod (131a), the two power line limiting holes are close to two ends of the supporting rod (131a) respectively, the power line limiting holes are in a circular truncated cone shape, the large-diameter end of each power line limiting hole faces the winding seat (132), fixing sleeves (131e) are embedded in the power line limiting holes respectively, the fixing sleeves (131e) are matched with the power line limiting holes, the heating power lines (14) penetrate through the fixing sleeves (131e), and the inner walls of the fixing sleeves (131e) are fixedly bonded with the heating power lines (14);

the heat conducting support rod is characterized in that a power line through hole is formed in the support rod body (121) along the axial direction of the support rod body, the outer end of the power line through hole penetrates out of the outer end face of the support rod body (121), the inner end of the power line through hole extends to the position of the limiting ring (122), an inclined communication hole is formed in the limiting ring (122), one end of the inclined communication hole is communicated with the power line through hole, the other end of the inclined communication hole extends out of the limiting ring (122), and a heating power line (14) sequentially penetrates through the inclined communication hole and the power line through hole and penetrates out of the heat conducting shell (11).

8. The solid medium heat transfer performance measurement method of claim 6, wherein: a heat source mounting hole is formed in the inner side wall of the box body (a), the stay bar body (121) is horizontally arranged, the outer end of the stay bar body (121) is inserted into the heat source mounting hole, a sealing cylinder (15) is arranged between the outer wall of the stay bar body (121) and the hole wall of the heat source mounting hole in a cushioning mode, the inner wall of the sealing cylinder (15) and the outer wall of the stay bar body (121) are sealed in a sticking mode, the outer wall of the sealing cylinder (15) is sealed with the hole wall of the heat source mounting hole, and the heating power line (14) extends out of the box body (a) through the heat source mounting hole;

the temperature sensing device is characterized in that a temperature sensing cantilever (25) is arranged on the side wall of the box body (a) opposite to the heat source mounting hole, the temperature sensing cantilever (25) is horizontally arranged, the temperature sensing cantilever (25) and the stay bar body (121) are positioned on the same straight line, the outer end of the temperature sensing cantilever (25) is fixedly connected with the inner side wall of the box body (a), and the inner end of the temperature sensing cantilever (25) is provided with the first temperature sensing module (2).

9. A solid medium heat transfer performance measurement method according to claim 8, wherein: a control display module (3) is arranged outside the box body (a), and the control display module (3) is simultaneously connected with the heat source (1) and the first temperature sensing module (2);

the first temperature sensing module (2) comprises a first temperature sensor (21) and a first emitter (22), and a signal output end of the first temperature sensor (21) is electrically connected with a signal input end of the first emitter (22);

the control display module (3) comprises a controller (33), a receiver (31) is connected to a signal receiving end of the controller (33), and a display screen (32) is connected to a display control end of the controller (33);

the signal output end of the first transmitter (22) is wirelessly connected with the signal input end of the receiver (31), and the output end of the receiver (31) is connected with the controller (33);

a second temperature sensing module (5) is arranged on the outer wall of the heat conducting shell (11), the second temperature sensing module (5) comprises a second temperature sensor (51) and a second emitter (52), the second temperature sensor (51) is attached to the outer wall of the heat conducting shell (11), the signal output end of the second temperature sensor (51) is connected with the signal input end of the second emitter (52), and the signal output end of the second emitter (52) emits a wireless signal to the receiver (31);

an on-off switch (16) is arranged on the heating power line (14), and the on-off switch (16) receives and executes a switch signal sent to the on-off switch by the controller (33).

10. A solid medium heat transfer performance measurement method according to claim 1, 2, 3, 7, 8 or 9, characterized by: a discharge port is formed in the bottom of the box body (a), a material return hopper (a3) is arranged below the box body (a), a shielding plate (a5) covers the feeding port, and a material blocking plate (a1) covers the discharge port;

a striker plate socket is arranged on the side wall of the box body (a) corresponding to the striker plate (a1), a striker plate slot is arranged on the inner wall of the box body (a) corresponding to the striker plate (a1), and the striker plate (a1) is inserted into the striker plate slot from the striker plate socket;

a shielding plate inserting opening is formed in the side wall of the box body (a) corresponding to the shielding plate (a5), a shielding plate inserting opening is formed in the inner wall of the box body (a) corresponding to the shielding plate (a5), and the material baffle plate (a1) is inserted into the shielding plate inserting opening from the shielding plate inserting opening;

the edge of the large opening end of the material returning hopper (a3) is connected with the box body (a), the material outlet is positioned above the large opening end of the material returning hopper (a3), and the small opening end of the material returning hopper (a3) is arranged downwards;

the box body (a) is arranged on a box body support (a4), the box body support (a4) comprises a support ring, at least three support legs are arranged on the support ring, the upper ends of the support legs are fixedly connected with the support ring, the box body (a) is positioned in the support ring, at least three bearing blocks (a2) are fixed on the outer wall of the box body (a), and the bearing blocks (a2) fall on the support ring.

Technical Field

The invention relates to a heat conduction measuring method, in particular to a measuring method for heat conduction performance of a material.

Background

The heat conductivity coefficient is a measurement for representing the strength of the heat conductivity of the material, and has an important guiding function on production, life and engineering application. The current methods for testing the heat conductivity coefficient of the material include a heat flow method, a hot plate method, a laser flash method, a transient plane heat source method and the like, and the method is a testing device which is adaptive to various testing methods. However, the methods have the defects of long time consumption and high cost; the testing device has the advantages of complex structure, high equipment cost and complex operation. In the teaching and testing process, only approximate evaluation of the heat-conducting property of the material is needed, and the traditional equipment and method are obviously not economical.

The specific requirements of different media (solid, liquid and gas) on the measuring device are different, for example, the tightness of the measuring device for gas and liquid materials is higher than that of solid materials, and the gas is not easy to completely fill.

Disclosure of Invention

In view of the above, the present invention provides a method for measuring heat conductivity of solid medium for powder and granular solid materials, which is fast, convenient, economical and economical, and can quantify the result.

The technical scheme is as follows:

the method for measuring the heat conduction performance of the solid medium is characterized by comprising the following steps of:

preparing a box body, wherein a feeding port is formed in the top of the box body, a heating source and a first temperature sensing module are arranged in the box body at intervals, and the heating source and the first temperature sensing module are respectively and fixedly arranged on the inner side wall of the box body;

heating the heating source to a target temperature and keeping the heating source at room temperature, and throwing the material to be tested into the box body from the feeding port within preset time to fill the box body with the material to be tested;

and step three, taking the time when the material to be measured starts to be added as an initial moment, continuously acquiring and recording the temperature data measured by the first temperature sensing module until the temperature measured by the first temperature sensing module is stable, and drawing a temperature-time curve.

As a preferred technical scheme, after the first step is completed, the material to be tested and the box body are placed at room temperature and stored for at least 24 hours, and then the second step is performed.

In the third step, the temperature data measured by the first temperature sensing module is obtained at the same time interval.

As a preferred technical scheme, the method also comprises the following steps: and fitting the slope of the temperature-time curve through linear regression to quantify the heat conduction performance of the material to be tested.

As a preferred technical scheme, the method also comprises the following step five: and cleaning the box body, and repeating the second step, the third step and the fourth step to quantify the heat conduction performance of different materials to be tested.

By adopting the technical scheme, the heat-conducting performance of the material can be simply and quickly quantitatively evaluated, the cost is saved, and the economical efficiency is better.

As a preferred technical scheme:

the heat source comprises a spherical heat-conducting shell, a hollow cavity is arranged in the heat-conducting shell, a supporting hole penetrates through the wall of the heat-conducting shell, a supporting rod penetrates through the supporting hole, the outer end of the supporting rod extends out of the heat-conducting shell, the inner end of the supporting rod extends into the hollow cavity and is connected with a heating component, and a gap is formed between the heating component and the inner wall of the heat-conducting shell;

the heat conduction shell comprises two hemispherical shells which are buckled with each other;

the annular end surfaces of the two hemispherical shells are respectively integrally formed with a pair of retaining rings, wherein one of the pair of retaining rings is positioned at the edge of the inner ring of the corresponding annular end surface, so that an inner retaining ring is formed; the other pair of retaining rings is positioned at the outer ring edge of the corresponding annular end surface, so that an outer retaining ring is formed;

the outer wall of the inner retaining ring is abutted against the inner wall of the outer retaining ring, a circle of buckling limiting ring is arranged on the inner wall of the outer retaining ring in the circumferential direction, a circle of buckling limiting groove is arranged on the outer wall of the inner retaining ring in the corresponding circumferential direction, and the buckling limiting ring falls into the buckling limiting groove;

the outer end face of the pair of snap rings is tightly abutted against the annular end face of the other semispherical shell, annular sealing ring grooves are simultaneously arranged on the outer end face of the pair of snap rings and the annular end face abutted against the outer end face of the pair of snap rings, and sealing rings are arranged in the sealing ring grooves;

buckling notches are respectively arranged at the edges of the two hemispherical shells, and the buckling notches of the two hemispherical shells are correspondingly arranged to form the supporting holes;

adopt this design, be convenient for set up other parts in the heat conduction casing to be convenient for open two hemisphere casings from lock breach, solved the dismouting problem.

The heat conduction shell is a copper ball shell. The heat conducting shell is made of red copper, has good heat conductivity, can conduct heat uniformly in a short time, and enables the heat conducting shell to form an isothermal body with equal temperature everywhere.

The support rod comprises a support rod body, the support rod body is arranged in the support hole in a penetrating mode along the diameter direction of the heat conduction shell, a limiting ring is fixed in the middle of the support rod body and located in the heat conduction shell, a spherical abutting surface matched with the inner wall of the heat conduction shell is arranged on the limiting ring, an inner side sealing washer is sleeved on the support rod body on the outer side of the limiting ring, and the spherical abutting surface tightly presses the inner side sealing washer on the inner wall of the heat conduction shell;

the heat conduction device is characterized in that a locking nut is sleeved on the support rod body in a threaded manner and located outside the heat conduction shell, an outer side sealing washer is sleeved on the support rod body between the locking nut and the heat conduction shell, and the outer side sealing washer is tightly pressed on the outer wall of the heat conduction shell through the locking nut.

According to the technical scheme, the limiting rings and the locking nuts are clamped on the inner side and the outer side of the heat conducting shell, so that the two ends of the support rod body are kept in a suspended state, and the heating component is suspended.

As a preferred technical scheme:

the heating assembly comprises a winding bracket, the winding bracket is connected with the inner end of the stay bar body, a winding seat is arranged on the winding bracket, an electric heating wire is wound on the winding seat, two ends of the electric heating wire are respectively connected with a heating power line, and the heating power line penetrates out of the heat conduction shell;

the winding support comprises a supporting rod, the supporting rod is perpendicular to the supporting rod body, the middle of the supporting rod is fixedly connected with the inner end of the supporting rod body, elastic clamping pieces are respectively fixed at two ends of the supporting rod, the winding seat is arranged between the elastic clamping pieces at the two ends of the supporting rod and is cylindrical, two ends of the winding seat are respectively abutted against the elastic clamping pieces, a thread-shaped winding groove is formed in the outer wall of the winding seat, and the heating wire is wound in the winding groove; by adopting the technical scheme, the electric heating wire is convenient to arrange, and the winding seat is convenient to disassemble and assemble;

limiting depressions are respectively formed in the end faces of the two ends of the winding seat, limiting chucks are respectively arranged on the elastic clamping piece corresponding to the limiting depressions, and the limiting chucks fall into the corresponding limiting depressions; so that the winding seat is stably clamped between the two elastic clamping pieces;

two power line limiting holes are formed in the supporting rod, the two power line limiting holes are close to two ends of the supporting rod respectively, the power line limiting holes are in a round table shape, the large-diameter ends of the power line limiting holes face the winding seat, fixing sleeves are embedded in the power line limiting holes respectively and matched with the power line limiting holes, heating power lines penetrate through the fixing sleeves, and the inner walls of the fixing sleeves and the heating power lines are fixedly bonded; thereby ensuring that the connection point of the heating power cord and the electric heating wire is not easy to pull out.

The heat conduction shell is characterized in that a power line through hole is formed in the support rod body along the axial direction of the support rod body, the outer end of the power line through hole penetrates out of the outer end face of the support rod body, the inner end of the power line through hole extends to the position of the limiting ring, an inclined communication hole is formed in the limiting ring, one end of the inclined communication hole is communicated with the power line through hole, the other end of the inclined communication hole extends out of the limiting ring, and a heating power line sequentially penetrates through the inclined communication hole and the power line through hole to penetrate out of the heat conduction shell. The design ingeniously solves the problem that the heating power line leads out the heat conduction shell, and the sealing problem during independent lead wire is avoided.

As a preferred technical scheme, a heat source mounting hole is formed in the inner side wall of the box body, the stay bar body is horizontally arranged, the outer end of the stay bar body is inserted into the heat source mounting hole, a sealing cylinder is arranged between the outer wall of the stay bar body and the hole wall of the heat source mounting hole in a cushioning manner, the inner wall of the sealing cylinder is stuck and sealed with the outer wall of the stay bar body, the outer wall of the sealing cylinder is sealed with the hole wall of the heat source mounting hole, and the heating power line extends out of the box body through the heat source mounting hole;

the side wall of the box body, which is opposite to the heat source mounting hole, is provided with a temperature sensing cantilever, the temperature sensing cantilever is horizontally arranged, the temperature sensing cantilever and the stay bar body are positioned on the same straight line, the outer end of the temperature sensing cantilever is fixedly connected with the inner side wall of the box body, and the inner end of the temperature sensing cantilever is provided with the first temperature sensing module. Technical scheme more than adopting, heat conduction casing and first temperature sensing module are all hung and are located in the box, are convenient for put into, take out the material in the upper and lower direction of box.

A control display module is arranged outside the box body and is simultaneously connected with the heat source and the first temperature sensing module;

the first temperature sensing module comprises a first temperature sensor and a first emitter, and the signal output end of the first temperature sensor is electrically connected with the signal input end of the first emitter;

the control display module comprises a controller, a receiver is connected to a signal receiving end of the controller, and a display screen is connected to a display control end of the controller;

the signal output end of the first transmitter is wirelessly connected with the signal input end of the receiver, and the output end of the receiver is connected with the controller;

a second temperature sensing module is arranged on the outer wall of the heat conduction shell and comprises a second temperature sensor and a second emitter, the second temperature sensor is attached to the outer wall of the heat conduction shell, the signal output end of the second temperature sensor is connected with the signal input end of the second emitter, and the signal output end of the second emitter emits a wireless signal to the receiver;

and an on-off switch is arranged on the heating power line and receives and executes a switch signal sent by the controller.

As a preferred technical scheme, a discharge port is formed in the bottom of the box body, a material returning hopper is arranged below the box body, a shielding plate covers the feeding port, and a material blocking plate covers the discharge port;

a striker plate socket is arranged on the side wall of the box body corresponding to the striker plate, a striker plate slot is arranged on the inner wall of the box body corresponding to the striker plate, and the striker plate is inserted into the striker plate slot from the striker plate socket;

a shielding plate inserting opening is formed in the side wall of the box body corresponding to the shielding plate, a shielding plate inserting groove is formed in the inner wall of the box body corresponding to the shielding plate, and the material blocking plate is inserted into the shielding plate inserting groove from the shielding plate inserting opening;

the edge of the large opening end of the material returning hopper is connected with the box body, the discharge opening is positioned above the large opening end of the material returning hopper, and the small opening end of the material returning hopper is arranged downwards;

the box body is arranged on the box body support, the box body support comprises a support ring, at least three support legs are arranged on the support ring, the upper ends of the support legs are fixedly connected with the support ring, the box body is located in the support ring, at least three bearing blocks are fixed on the outer wall of the box body, and the bearing blocks fall on the support ring.

The box of structure more than adopting can make things convenient for quick interpolation and discharge the material that awaits measuring.

Has the advantages that: the method for measuring the heat conduction performance of the solid medium can be used for simply and quickly measuring and analyzing the heat conduction effect of the material, so that the heat conduction performance of the material is roughly obtained in a quantitative manner, the cost is lower, and the economical efficiency is better.

Drawings

FIG. 1 is a temperature-time curve of river sand measured in Table 1;

FIG. 2 is a temperature-time curve of the aluminum powder measured in Table 1;

FIG. 3 is a schematic view of the installation of the case a;

FIG. 4 is a schematic structural view of the case a in FIG. 3;

fig. 5 is a schematic view showing a state in which the heat source 1 and the first temperature sensing module 2 are mounted in the case a;

fig. 6 is a schematic structural view of the heat source 1;

fig. 7 is a schematic view of the connection relationship between the stay bar 12 and the heat generating component 13;

fig. 8 is a schematic view illustrating the installation relationship between the stay 12 and the heat conductive housing 11;

fig. 9 is a schematic structural view of the heat generating component 13;

FIG. 10 is an enlarged view of the j portion of FIG. 9;

fig. 11 is a schematic structural view of the heat conductive housing 11;

FIG. 12 is an enlarged view of section i of FIG. 11;

FIG. 13 is an enlarged view of section k of FIG. 5;

fig. 14 is a schematic view of a connection relationship between the first temperature sensing module 2, the second temperature sensing module 5, and the control display module 3.

Detailed Description

The invention is further illustrated by the following examples and figures.

A method for measuring the heat conduction performance of a solid medium is characterized by comprising the following steps:

firstly, preparing a box body a, arranging a feed opening at the top of the box body a, arranging a heating source 1 and a first temperature sensing module 2 in the box body a at intervals, and fixedly installing the heating source 1 and the first temperature sensing module 2 on the inner side wall of the box body a respectively;

firstly, a material to be detected and the box body a are stored for at least 24 hours at room temperature (25 ℃) so that the temperature of the material to be detected and the box body a is consistent with the room temperature;

step two, heating the heating source 1 to a target temperature and keeping the temperature at room temperature, and throwing the material to be detected into the box body a from the feeding port within a preset time to fill the box body a with the material to be detected;

taking the time when the material to be measured starts to be added as an initial moment, continuously acquiring and recording temperature data measured by the first temperature sensing module 2 until the temperature measured by the first temperature sensing module 2 is stable, and drawing a temperature-time curve;

specifically, the temperature data measured by the first temperature sensing module 2 is acquired at the same time interval;

step four: fitting the slope of a temperature-time curve through linear regression to quantify the heat conduction performance of the material to be measured;

step five: and cleaning the box body a, and repeating the second step, the third step and the fourth step to quantify the heat conduction performance of different materials to be tested.

The target temperature and the preset time in the above steps are set artificially, wherein the target temperature should be higher than room temperature (25 ℃), such as 60 ℃, 85 ℃, 120 ℃, 200 ℃, and the preset time may be 0.5min, 1min, 2min, 5min, and the preset time should be as short as possible in order to improve the accuracy of measurement, but it should be ensured that the box body a can be filled in the preset time, and when different materials are measured, the target temperature and the preset time should be kept constant to unify the measurement standards and facilitate comparison. In the third step, when the feeding is started, the temperature measured by the first temperature sensing module 2 is room temperature (25 ℃), and then the temperature is measured once at the same time interval, wherein the time interval can be 10s, 20s, 30s, 1min, 2min and 5 min.

The device is suitable for measuring powdery and granular (better small-particle) solid materials, such as metal powder, various fillers and sandstone solids.

As a specific implementation manner, as shown in fig. 3 to 14, a discharge port is formed at the bottom of the box body a, a material return hopper a3 is arranged below the box body a, a shielding plate a5 covers the material inlet, and a material blocking plate a1 covers the discharge port;

a striker plate socket is arranged on the side wall of the box body a corresponding to the striker plate a1, a striker plate slot is arranged on the inner wall of the box body a corresponding to the striker plate a1, and the striker plate a1 is inserted into the striker plate slot from the striker plate socket;

a shielding plate inserting opening is formed in the side wall of the box body a corresponding to the shielding plate a5, a shielding plate inserting opening is formed in the inner wall of the box body a corresponding to the shielding plate a5, and the material baffle plate a1 is inserted into the shielding plate inserting opening from the shielding plate inserting opening;

the edge of the large opening end of the material returning hopper a3 is connected with the box body a, the material outlet is positioned above the large opening end of the material returning hopper a3, and the small opening end of the material returning hopper a3 is arranged downwards;

the box body a is arranged on a box body support a4, the box body support a4 comprises a support ring, at least three support legs are arranged on the support ring, the upper ends of the support legs are fixedly connected with the support ring, the box body a is positioned in the support ring, at least three bearing blocks a2 are fixed on the outer wall of the box body a, and the bearing blocks a2 fall on the support ring.

The heat source 1 comprises a spherical heat-conducting shell 11, a hollow cavity 1a is arranged in the heat-conducting shell 11, a support hole 11a penetrates through the wall of the heat-conducting shell 11, a support rod 12 penetrates through the support hole 11a, the outer end of the support rod 12 extends out of the heat-conducting shell 11, the inner end of the support rod 12 extends into the hollow cavity 1a and is connected with a heating component 13, and a gap is formed between the heating component 13 and the inner wall of the heat-conducting shell 11;

the heat conducting shell 11 is a copper ball shell, and in order to facilitate installation of internal components, the heat conducting shell 11 adopts a split structure. Specifically, the heat conducting shell 11 includes two hemispherical shells 111, and the two hemispherical shells 111 are fastened to each other;

opposite snap rings 112 are integrally formed on the annular end surfaces of the two hemispherical shells 111 respectively, wherein one of the opposite snap rings 112 is positioned at the inner ring edge of the corresponding annular end surface, so as to form an inner snap ring; the other pair of retaining rings 112 is located at the outer ring edge of the corresponding annular end face, thereby forming an outer retaining ring;

the outer wall of the inner retaining ring is abutted against the inner wall of the outer retaining ring, a circle of buckling limiting ring 114 is arranged on the inner wall of the outer retaining ring in the circumferential direction, a circle of buckling limiting groove is arranged on the outer wall of the inner retaining ring in the corresponding circumferential direction, and the buckling limiting ring 114 falls into the buckling limiting groove;

the outer end face of the pair of snap rings 112 abuts against the annular end face of the other hemispherical shell 111, the outer end face of the pair of snap rings 112 and the annular end face abutting against the outer end face are simultaneously provided with annular sealing ring grooves, and a sealing ring 113 is arranged in each sealing ring groove;

buckling notches are respectively arranged at the edges of the two hemispherical shells 111, and the buckling notches of the two hemispherical shells are correspondingly arranged to form the support holes 11 a;

the stay bar 12 comprises a stay bar body 121, the stay bar body 121 is arranged in the support hole 11a in a penetrating manner along the diameter direction of the heat-conducting shell 11, a limit ring 122 is fixed in the middle of the stay bar body 121, the limit ring 122 is positioned in the heat-conducting shell 11, a spherical abutting surface matched with the inner wall of the heat-conducting shell 11 is arranged on the limit ring 122, an inner-side sealing washer 123 is sleeved on the stay bar body 121 outside the limit ring 122, and the spherical abutting surface presses the inner-side sealing washer 123 against the inner wall of the heat-conducting shell 11;

a locking nut 124 is sleeved on the stay bar body 121 in a threaded manner, the locking nut 124 is located outside the heat conduction shell 11, an outer sealing washer 125 is sleeved on the stay bar body 121 between the locking nut 124 and the heat conduction shell 11, and the locking nut 124 presses the outer sealing washer 125 against the outer wall of the heat conduction shell 11.

The heating assembly 13 includes a winding bracket 131, the winding bracket 131 is connected to the inner end of the stay rod body 121, a winding seat 132 is disposed on the winding bracket 131, a heating wire 133 is wound on the winding seat 132, two ends of the heating wire 133 are respectively connected to a heating power line 14, and the heating power line 14 penetrates through the heat conducting shell 11; the winding seat 132 is made of quartz stone, and the winding bracket 131 is made of stainless steel;

the winding bracket 131 comprises a supporting rod 131a, the supporting rod 131a is perpendicular to the supporting rod body 121, the middle of the supporting rod 131a is fixedly connected with the inner end of the supporting rod body 121, elastic clamping pieces 131b are respectively fixed at two ends of the supporting rod 131a, the winding seat 132 is arranged between the elastic clamping pieces 131b at two ends of the supporting rod 131a, the winding seat 132 is cylindrical, two ends of the winding seat 132 are respectively abutted against the elastic clamping pieces 131b, a thread-shaped winding groove is arranged on the outer wall of the winding seat 132, and the heating wire 133 is wound in the winding groove;

limiting depressions are respectively arranged on the end surfaces of the two ends of the winding seat 132, limiting chucks 131c are respectively arranged on the elastic clamping pieces 131b corresponding to the limiting depressions, and the limiting chucks 131c fall in the corresponding limiting depressions;

two power line limiting holes are formed in the supporting rod 131a, the two power line limiting holes are respectively close to two ends of the supporting rod 131a, the power line limiting holes are in a circular truncated cone shape, the large-diameter end of each power line limiting hole faces the winding seat 132, fixing sleeves 131e are respectively embedded in the power line limiting holes, the fixing sleeves 131e are matched with the power line limiting holes, the heating power line 14 penetrates through the fixing sleeves 131e, and the inner wall of each fixing sleeve 131e is fixedly bonded with the heating power line 14;

a power line via hole is axially formed in the stay bar body 121, an outer end of the power line via hole penetrates out of an outer end face of the stay bar body 121, an inner end of the power line via hole extends to the position of the limit ring 122, an inclined communication hole is formed in the limit ring 122, one end of the inclined communication hole is communicated with the power line via hole, the other end of the inclined communication hole extends out of the limit ring 122, and the heating power line 14 sequentially penetrates through the inclined communication hole and the power line via hole and penetrates out of the heat conduction shell 11.

A heat source mounting hole is formed in the inner side wall of the box body a, the stay bar body 121 is horizontally arranged, the outer end of the stay bar body 121 is inserted into the heat source mounting hole, a sealing cylinder 15 is arranged between the outer wall of the stay bar body 121 and the hole wall of the heat source mounting hole in a cushioning manner, the inner wall of the sealing cylinder 15 is sealed with the outer wall of the stay bar body 121 in a sticking manner, the outer wall of the sealing cylinder 15 is sealed with the hole wall of the heat source mounting hole, and the heating power line 14 extends out of the box body a through the heat source mounting hole;

the side wall of the box body a opposite to the heat source mounting hole is provided with a temperature sensing cantilever 25, the temperature sensing cantilever 25 is horizontally arranged, the temperature sensing cantilever 25 and the stay bar body 121 are positioned on the same straight line, the outer end of the temperature sensing cantilever 25 is fixedly connected with the inner side wall of the box body a, and the inner end of the temperature sensing cantilever 25 is provided with the first temperature sensing module 2.

A control display module 3 is arranged outside the box body a, and the control display module 3 is simultaneously connected with the heat source 1 and the first temperature sensing module 2;

the first temperature sensing module 2 comprises a first temperature sensor 21 and a first emitter 22, wherein a signal output end of the first temperature sensor 21 is electrically connected with a signal input end of the first emitter 22, the first temperature sensor 21 is positioned on an extension line of the stay bar body 121, and the first temperature sensor 21 is provided with a sensor power supply;

the control display module 3 comprises a controller 33, a receiver 31 is connected to a signal receiving end of the controller 33, and a display screen 32 is connected to a display control end of the controller 33;

the signal output end of the first transmitter 22 is wirelessly connected with the signal input end of the receiver 31, and the output end of the receiver 31 is connected with the controller 33;

a second temperature sensing module 5 is arranged on the outer wall of the heat conducting shell 11, the second temperature sensing module 5 includes a second temperature sensor 51 and a second emitter 52, the second temperature sensor 51 is attached to the outer wall of the heat conducting shell 11, a signal output end of the second temperature sensor 51 is connected with a signal input end of the second emitter 52, a signal output end of the second emitter 52 emits a wireless signal to the receiver 31, the second temperature sensor 51 is located on an extension line of the stay bar body 121, and the second temperature sensor 51 is provided with a sensor power supply; the first transmitter 22 and the second transmitter 52 are in communication with the receiver 31 in advance;

the heating power line 14 is connected with a heating power supply, an on-off switch 16 is arranged on the heating power line 14 between the heating power supply and the heating component 13, and the on-off switch 16 receives and executes a switching signal sent to the on-off switch by the controller 33.

During the test, the heating power supply can carry out thermostatic heating to heat conduction casing 11, and specifically, second temperature sensor 51 is used for measuring the temperature of heat conduction casing 11 in real time to heat heating element 13 in real time through controller 33, make heat conduction casing 11 temperature remain stable. The first temperature sensor 21 measures the temperature of the position where the first temperature sensor is located at different moments, feeds the test result back to the controller 33, finally displays the test result on the display screen 32 according to a set time interval, and records the display result to obtain temperature data.

When feeding materials, firstly inserting the material baffle a1 in place to seal the discharge port, then opening the shielding plate a5, feeding the materials to be measured into the box body a, and finally sealing the feeding port by the shielding plate a5 to start measurement; after the measurement is finished, the striker plate a1 is slowly pulled, the material to be measured falls into the material return hopper a3, and the material to be measured is recycled.

Test example:

the heating temperature of the heat conducting shell 11 is set to be 65 ℃, the distance between the heat source 1 and the first temperature sensing module 2 is set to be 10cm, the distance between the heat source 1 and the first temperature sensing module 2 is measured by the nearest distance between the heat source 1 and the first temperature sensing module 2, the box body a is a square box body, the size (length, width and height) of an inner cavity of the box body a is 60cm, 60cm and 60cm, the wall thickness of the box body a is 4mm, and the box body a is made of stainless steel. The temperature-time curves of a river sand sample (35-40 meshes) and an aluminum powder sample (more than or equal to 100 meshes) are respectively mapped by adopting the method, and the slope is fitted. Wherein the time interval is 2min when the temperature-time curve of the river sand is mapped, and the time interval is 30s when the temperature-time curve of the aluminum powder is mapped; the measured temperature-time data are shown in tables 1 and 2, respectively, and the corresponding temperature-time curves are shown in fig. 1 and 2, respectively.

TABLE 1 temperature-time data sheet for river sand and aluminum powder

The temperature-time curves drawn according to table 1 are shown in fig. 1 and 2, respectively, and it can be seen from fig. 1 and 2 that the temperature increases with the passage of time, and after reaching a certain time, the temperature increases slowly and smoothly. This is because the material heating-heat dissipation at the first temperature sensing module 2 is substantially balanced, and the temperature change is small. The slope of the temperature-time curve of the river sand of figure 1 obtained by linear regression fitting is 0.24; the slope of the temperature-time curve of the aluminum powder in FIG. 2 obtained by linear regression fitting was 3.11. Therefore, the heat conduction performance of the aluminum powder is obviously superior to that of river sand.

In addition to the above method, the heating power supply may also perform constant voltage heating on the heat conductive housing 11; specifically, for the same heating wire 133, the resistance value is constant, and the heating power supply supplies a constant voltage to the same heating wire 133, so that the heating amount of the heating wire 133 is ensured to be constant, and the heat-conducting shell 11 is heated by means of heat radiation, and this heating method does not concern about the temperature change of the heat-conducting shell 11, and only needs to control the on-off switch 15 to be turned on or off when starting and ending measurement.

When the heat conductivity/heat conductivity of various materials is measured, a plurality of first temperature sensing modules 2 can be further arranged, and the plurality of first temperature sensing modules 2 are distributed along the diameter direction of the second temperature sensor 51, so that the first temperature sensors 21 are arranged at positions with different distances from the second temperature sensor 51, a change curve of temperature difference measured by the plurality of first temperature sensors 21 and the second temperature sensor 51 along the distance at the same moment is measured and drawn, and the temperature sensing cantilever 25 is further provided with scale marks along the length thereof.

Finally, it should be noted that the above-mentioned description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and scope of the present invention.