A conveyor belt testing machine

Abstract

The application discloses a conveying belt detection tester, which comprises a base, a vertical support installed on the base, a cross beam connected with the upper part of the vertical support, a stand column with the top connected with the cross beam and the bottom connected with the base, a loading device for supporting the movement of a sample to be tested, which is installed on the vertical support, connected with the stand column and longitudinally movable along the stand column, and a heating and heat preserving device installed on the base and internally provided with heat conducting materials for testing the sample; the loading device comprises a loading part for loading axial load, a free angle holder and a connecting assembly arranged between the loading part and the free angle holder, and the top end of the free angle holder is hinged with the connecting assembly so that the free angle holder changes a certain angle during the sample testing to realize the bending of the sample with different radian. By arranging the free angle holder, the radian direction and stress mode of the sample are ensured to be closer to the actual use state, the test working condition of the tester is closer to the actual working condition, and the performance of the measured material is more accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of conveyor belt detection, in particular to a conveyor belt detection tester for simulating the dynamic simulation state of a conveyor belt conveying high-temperature materials. BACKGROUND

[0002] The statements herein merely provide background technology related to the present disclosure, and do not necessarily constitute prior art.

[0003] A conveyor belt is a rubber and fiber, metal composite product used in a belt conveyor to bear and transport materials, or a plastic and fabric composite product. Conveyor belts are used in various applications, and as the main bearing component and traction body, their performance directly affects the safety and efficiency of the entire equipment operation.

[0004] For conveyor belts conveying high-temperature materials, the existing test machine detects the sample in a single detection mode, only considering the vertical force of the horizontally laid sample, and does not consider the actual situation of different bending radii of conveyor belts carrying different goods. The test process cannot better simulate the actual use process.

[0005] Therefore, for conveyor belts conveying high-temperature materials, how to design a conveyor belt detection tester that closely simulates the actual use conditions is a problem that needs to be solved by the technical personnel in the field. SUMMARY

[0006] To solve the problems in the prior art, the present application provides a conveyor belt detection tester, which adjusts the radius direction and stress mode during conveyor belt detection at any angle, more closely simulates the actual use state, and more accurately measures the performance of the material.

[0007] The technical scheme of the present application is as follows:

[0008] The present application provides a conveyor belt detection tester, comprising: a base; a vertical support installed on the base; a cross beam connected to the upper part of the vertical support; a stand column, the top of which is connected to the cross beam, and the bottom of which is connected to the base; a loading device for supporting the movement of the sample to be tested, installed on the cross beam, connected to the stand column and movable along the longitudinal direction of the stand column; a heating and heat preservation device installed on the base, which contains granular heat-conducting materials for testing the performance of the sample; the loading device comprises a loading part for loading axial load, a free angle holder for clamping the sample, and a connecting assembly arranged between the loading part and the free angle holder, the top end of the free angle holder is hinged to the connecting assembly, so that the free angle holder changes a certain angle during sample testing, thereby realizing the testing of the sample in different bending radii.

[0009] Further, the connecting assembly comprises a guide part sleeved on the column and longitudinally moving along the column, the guide part is horizontally arranged, and the movable end of the loading part is installed on the guide part; a first baffle is horizontally arranged and is hingedly connected with the free-angle holder at the bottom; and a limiting column is used to connect the guide part, the first baffle and the free-angle holder together to realize synchronous movement.

[0010] Further, the loading part comprises a first cylinder and a first pneumatic proportional valve used to adjust the pressure of the first cylinder, or an electric cylinder and a rack and pinion device used to adjust the rotating speed of the electric cylinder.

[0011] Further, the free-angle holder comprises an upper clamping plate and a lower clamping plate, and a handle is hingedly connected to the top end of the upper clamping plate, and the handle is used to move the upper clamping plate to approach or move away from the lower clamping plate.

[0012] Further, a pressing plate is horizontally arranged between the guide part and the first baffle, and a pressure sensor is arranged on the upper part of the pressing plate and is used to detect the pressure of the loading part loaded to the free-angle holder.

[0013] Further, a second baffle is arranged at the bottom of the pressing plate and has a size larger than that of the pressing plate.

[0014] Further, the heating and heat-preserving device comprises a box body, a double-door device arranged on the top of the box body, a driving part used to drive the double-door device to open and close, the number of the driving parts is two, one driving part is connected to each door, a heating assembly arranged in the lower part of the box body and used to heat the heat-conducting material, and a temperature sensor arranged in the box body and located on the upper part of the heating assembly and used to detect the temperature of the heat-conducting material, wherein the heat-conducting material is placed in the box body and covers the heating assembly and the temperature sensor, and an automatic hot air circulation supplementing device is further arranged on one side door of the double-door device.

[0015] Further, the device further comprises a display part connected with the pressure sensor and the temperature sensor respectively and used to collect and display the sending signals of the two sensors, and a control part connected with the display part, the loading part, the driving part and the automatic hot air circulation supplementing device respectively and used to analyze and judge the signals sent by the display part and control the actions of the loading part, the driving part and the automatic hot air circulation supplementing device according to the received signals.

[0016] Further, the driving part is arranged as a second cylinder and a second pneumatic proportional valve used to adjust the pressure of the second cylinder.

[0017] Further, the heating assembly comprises a plurality of uniformly arranged heaters, each of which is externally wrapped with a heat-conducting shell; the air circulation supplementing device comprises an air duct, an air inlet and an air outlet, a pull rod assembly is installed in the air duct, one end of the pull rod assembly is provided with a sealing element, the sealing element is matched with the air inlet, a third air cylinder drives the pull rod assembly to extend or retract to open or close the air inlet, and hot air forms a cold and hot air flow in the box body through the air inlet and the air outlet to automatically supplement the air volume.

[0018] The present application has the following beneficial effects:

[0019] 1. The free-angle holder of the embodiment of the present application ensures that the sample arc direction and stress mode are closer to the actual use state, so that the test working condition of the testing machine is closer to the actual working condition, and the mechanical properties of the measured material are more accurate.

[0020] 2. The heating and heat preservation device with heat preservation function of the embodiment of the present application prevents the problems of fast equipment heat dissipation and inaccurate temperature control, and is more energy-efficient. DETAILED DESCRIPTION

[0021] Figure 1 is a three-dimensional schematic view of the overall structure of the embodiment of the present application.

[0022] Figure 2 is a structural cross-sectional view of the free-angle holder of the embodiment of the present application.

[0023] Figure 3 is a structural cross-sectional view of the sample testing of the embodiment of the present application.

[0024] Figure 4 is a side view of the overall structure of the embodiment of the present application.

[0025] Figure 5 is a side view of the loading device structure of the embodiment of the present application.

[0026] Figure 6 is a top view of the loading device structure of the embodiment of the present application.

[0027] Figure 7 is Figure 5 is a partial projection view of A in FIG.

[0028] Figure 8 is a structural cross-sectional view of the automatic hot air circulation supplementing device of the embodiment of the present application (working state).

[0029] Figure 9 is a structural cross-sectional view of the automatic hot air circulation supplementing device of the embodiment of the present application (non-working state).

[0030] Figure 10 is a structural profile schematic diagram of embodiment two of the present application.

[0031] Figure 11 is a structural side view schematic diagram of embodiment two of the present application.

[0032] In the figure, 100, base; 200, vertical support; 300, cross beam; 400, stand; 500, loading device; 510, loading part; 511, first pneumatic proportional valve; 512, first air cylinder; 513, electric cylinder; 514, gear rack device; 520, free angle clamp; 521, upper clamping plate; 522, lower clamping plate; 523, handle; 530, connecting assembly; 531, guide part; 532, first baffle; 533, limiting column; 534, hinge; 535, pressing plate; 536, second baffle; 537, pressure sensor; 600, heating and heat preservation device; 610, heat-conducting material; 620, double-door device; 621, second air cylinder; 622, second pneumatic proportional valve; 630, heating assembly; 640, first temperature sensor; 650, automatic hot air circulation supplementing device; 651, third air cylinder; 652, air duct; 653, air inlet; 654, air outlet; 655, pull rod assembly; 656, sealing element; 1, sample. DETAILED DESCRIPTION

[0033] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0034] It should be noted that when a component is referred to as "mounted on" another component, it can be directly on the other component or there can be a middle component. When a component is referred to as "disposed on" another component, it can be directly disposed on the other component or there can be a middle component. When a component is referred to as "fixed to" another component, it can be directly fixed to the other component or there can be a middle component.

[0035] It should be noted that, unless otherwise explicitly specified and limited, the terms "arranged", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, or can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0037] In order for those skilled in the art to understand the present application, the following will be described in conjunction with the accompanying drawings Figures 1-9 The specific embodiments of the present application are described.

[0038] Example 1

[0039] As Figures 1-4 shown, the present application provides a conveyor belt detection tester, comprising a rack, a loading device 500 and a heating and holding device 600.

[0040] The rack comprises a base 100, a vertical support 200, a cross beam 300 and a stand column 400. The vertical support 200 is installed on the base 100. The cross beam 300 is connected to the upper part of the vertical support 200. The stand column 400 is connected to the cross beam 300 at the top and to the base 100 at the bottom.

[0041] Specifically, as shown in Figure 1 , 2 , 4, the base 100 is arranged in a frame structure and combined for installation. The specific installation method can be welding connection or bolt connection. In order to facilitate transportation, four moving wheels are installed at the bottom of the base 100. At least two of the moving wheels are universal wheels with locking function.

[0042] The vertical support 200 is installed on the base 100 and located on one side of the base 100. The installation method can be fixedly connected by bolts. The top of the vertical support 200 is provided with the cross beam 300.

[0043] As Figure 2 , 3 shown, in this embodiment, the number of stand columns 400 is two. The two stand columns 400 are high-precision metal stand columns 400 in parallel arrangement and cylindrical shape. The bottom is fixedly installed on the base 100 by bolts, and the top is installed on both ends of the cross beam 300.

[0044] Loading device 500 for supporting the movement of the test sample 1, mounted on the cross beam 300, connected with the column 400 and can move longitudinally along the column 400.

[0045] As shown in Figure 5 , the loading device 500 includes a loading part 510 for loading axial load, a free angle holder 520 for clamping the test sample 1, and a connecting assembly 530 arranged between the loading part 510 and the free angle holder 520. The top end of the free angle holder 520 is hinged to the connecting assembly 530, so that the free angle holder 520 changes a certain angle during the test of the test sample 1, thereby realizing the test of the test sample 1 in different arc bending states.

[0046] Specifically, the loading part 510 includes a cylinder and a pneumatic proportional valve for adjusting the pressure of the cylinder. It should be noted that in this embodiment, in order to distinguish the cylinder and the pneumatic proportional valve in the double-door device 620 described below, they are named as the first cylinder 512 and the first pneumatic proportional valve 511. The double-door device 620 is named as the second cylinder 621 and the second pneumatic proportional valve 622.

[0047] The cylinder barrel of the first cylinder 512 is fixedly installed on the cross beam 300.

[0048] In order to facilitate the fixed installation of the pneumatic proportional valve and the arrangement of the wiring connection between the cylinder and the pneumatic proportional valve, a side plate is further provided on the rack, which is located on one side of the vertical support 200, as shown in Figure 1 、 4 .

[0049] As shown in Figure 5 、 6 , specifically, the connecting assembly 530 includes a guide part 531, a first baffle 532 and a limiting column 533.

[0050] The guide part 531 is sleeved on the column 400 and moves longitudinally along the column 400. The guide part 531 is horizontally arranged, and the loading part 510 is installed on the guide part 531. The first baffle 532 is horizontally arranged, and the bottom is connected with the hinge 534 of the free angle holder 520. The limiting column 533 is used to connect the guide part 531, the first baffle 532 and the free angle holder 520 together to realize synchronous movement.

[0051] Further, a pressurizing plate 535 is horizontally arranged between the guide part 531 and the first baffle 532. The pressurizing plate 535 is provided with a pressure sensor 537 on the upper part for detecting the pressure of the loading part 510 loaded to the free angle holder 520.

[0052] In order to prevent high temperature from affecting the service life of the pressure sensor 537, a second baffle plate 536 is arranged at the bottom of the pressing plate 535, which is used to resist the heat of the heating and heat preservation device 600, and the size of the second baffle plate 536 is larger than that of the pressing plate 535.

[0053] As shown in Figure 5 , the first cylinder 512 is fixedly installed in the middle of the cross beam 300, and a through hole is arranged in the cross beam 300 for the piston rod of the cylinder to smoothly pass through.

[0054] A mounting hole is arranged at each end of the guide part 531, and a bearing is mounted on the mounting hole. The guide part 531 is movably connected with the stand column 400 through the bearing, so that the guide part 531 can smoothly move longitudinally along the stand column 400. In this embodiment, the bearing is a flange linear bearing. A plurality of threaded holes are arranged in the middle of the guide part 531. The piston rod of the cylinder is fixedly installed on the upper part of the guide part 531, and a sensor connecting shaft is fixedly installed on the lower part of the guide part 531. The pressure sensor 537 connected with the sensor connecting shaft is fixedly installed on the pressing plate 535 by bolts. The second baffle plate 536 is fixedly installed on the lower part of the pressing plate 535 by bolts.

[0055] The limiting column 533 is vertically arranged and sequentially connected with the guide column, the pressing plate 535, the second baffle plate 536 and the first baffle plate 532 from top to bottom. The first baffle plate 532 is connected with the free angle clamp 520 through the hinge 534.

[0056] Specifically, as shown in Figure 5 , 7 , the free angle clamp 520 includes an upper clamping plate 521 and a lower clamping plate 522. A handle 523 is hingedly connected to the top end of the upper clamping plate 521. The upper clamping plate 521 is moved downward to clamp the test sample 1 by moving the handle 523.

[0057] As shown in Figure 7 , the number of the free angle clamp 520 is four. When working, the four corners of the test sample 1 are clamped.

[0058] As shown in Figures 1-4 , the heating and heat preservation device 600 is installed on the base 100, and a granular heat-conducting material 610 for testing the performance of the test sample 1 is arranged in the heating and heat preservation device 600.

[0059] Specifically, the heating and heat preservation device 600 includes a box body, a double-door device 620, a driving part, a heating assembly 630, a first temperature sensor 640 and an automatic hot air circulation and supplementing device 650.

[0060] The double-door device 620 is located on the top of the enclosure. One of the doors of the double-door device 620 is also equipped with an automatic hot air circulation and replenishment device 650.

[0061] The drive unit is used to drive the double door device 620 to open and close. There are two drive units, with one drive unit connected to each door.

[0062] The heating component 630 is located at the bottom of the chamber and is used to heat the heat-conducting material 610.

[0063] The first temperature sensor 640 is installed inside the chamber and located above the heating assembly 630, and is used to detect the temperature of the heat-conducting material 610.

[0064] Thermally conductive material 610 is placed inside the chamber and covers the heating assembly 630 and the first temperature sensor 640.

[0065] The heating assembly 630 includes multiple evenly arranged heaters, each of which is externally encased in a heat-conducting shell, such as... Figure 1 As shown, in this embodiment, the heater is configured as a long column, with both ends fixedly installed on two opposite side walls of the housing.

[0066] The automatic hot air circulation and replenishment device 650 includes an air inlet 653 and an air outlet 654. A pull rod assembly 655 is installed in the air duct 652. A seal 656 is installed at one end of the pull rod assembly 655. The seal 656 cooperates with the air inlet 653. A third cylinder 651 drives the pull rod assembly 655 to extend or retract to open or close the air inlet 653. During operation, hot air is automatically replenished by forming a hot and cold airflow into the box through the air inlet 653 and the air outlet 654.

[0067] like Figure 8 The diagram shows a cross-sectional view of the automatic hot air circulation and replenishment device 650 in operation. The arrows indicate the direction of air movement. The third cylinder 651 is activated, and the piston rod of the third cylinder 651 moves downward, driving the pull rod assembly 655 mounted on the piston rod to move. The seal 656 moves downward, and the air inlet 653 is opened. Hot air enters the air duct 652 from the air inlet 653 and is finally discharged from the air outlet 654.

[0068] like Figure 9 As shown, the cylinder is not activated, the seal 656 is located at the air inlet 653, the air inlet 653 is in a sealed and closed state, and hot air cannot enter the air duct 652 from the air inlet 653.

[0069] The thermally conductive material 610 is shaped as an irregular block and is made of a metal with good thermal conductivity.

[0070] Before the test, punch holes on the upper surface, middle, lower surface of the sample 1, and put in temperature sensors, real-time monitoring the temperature of the upper, middle, lower of the sample. In order to distinguish from the first temperature sensor 640, the sensors used for detecting the temperature of the upper, middle, lower of the sample are named as the second temperature sensor, the third temperature sensor and the fourth temperature sensor.

[0071] The conveyor belt detection test machine further comprises a display part connected with the pressure sensor 537, the first temperature sensor 640, the second, third, fourth temperature sensors respectively, for collecting and displaying the above transmission signals, the display part can be located on the upper computer, which is convenient for the operator to observe in time; a control part connected with the display part, the loading part 510, the driving part, the automatic hot air circulation supplement device 650 respectively, for analyzing and judging the signals transmitted by the display part and controlling the loading part 510 and the driving part, the automatic hot air circulation supplement device 650 according to the received signals. The control part can be selected as PLC control.

[0072] The signal detected by the pressure sensor 537 is transmitted to the PLC, the PLC completes the operation processing according to its internal algorithm program and issues instructions to the first air cylinder 512, the first air cylinder 512 acts to control the up and down of the free angle clamp 520 clamping the sample 1.

[0073] The signal detected by the first temperature sensor 640 is transmitted to the PLC, the PLC completes the operation processing according to its internal algorithm program and issues instructions to the heater, when the temperature reaches the upper limit of the set temperature, the heating is stopped, when the temperature drops to the lower limit of the set temperature, the heating is resumed, the PLC controls the operation of the automatic hot air circulation supplement device 650 Fan to keep the box warm.

[0074] The PLC also controls the second air cylinder 621 to act to control the opening and closing of the double doors of the heating and insulation device 600.

[0075] The PLC also controls the third air cylinder 651 to act to control the extension and retraction of the pull rod assembly 655, and then controls the opening or closing of the air inlet 653.

[0076] Working process:

[0077] The heater preheats the heat-conducting material 610 in the heating and heat preservation device 600 according to the set temperature, and the automatic hot air circulation supplement device 650 is automatically opened and closed at a timing during the heating. When the heating reaches the set temperature, the pneumatic double-door device 620 is opened, the free-angle holder 520 clamps the sample 1 to be tested, the first pneumatic proportional valve 511 is controlled according to the set pressure, the first cylinder 512 pushes the sample 1 to the surface of the heat-conducting material 610, the pressure sensor 537 controls the pressure borne by the sample 1, the sample 1 is kept for fine adjustment according to the required loading time, when the set time is reached, the cylinder automatically lifts the sample 1 to separate it from the heat-conducting material 610, when the non-contact set time is reached, the first cylinder 512 pushes the sample 1 to the surface of the heated material again, the temperatures of the surface of the heat-conducting material 610, the upper surface of the sample 1, the middle of the sample 1 and the lower surface of the sample 1 are displayed in real time, and the reciprocating cycle is repeated until the required number of tests is reached. The first cylinder 512 lifts the sample 1 to the initial position, the sample 1 is removed, the heater stops heating, the double-door device 620 is closed, and the test is completed.

[0078] Example Two

[0079] As shown in Figure 10 , 11 The difference between the example and example one is that the loading part 510 includes a first driving device and a first pneumatic proportional valve 511 for adjusting the pressure of the first driving device, the first driving device is provided with an electric cylinder 513 and a gear and rack device 514, and the remaining structure is the same and will not be described here.

[0080] Specifically, the electric cylinder 513 is a servo electric cylinder 513.

[0081] Working process:

[0082] The heater preheats the heat-conducting material 610 in the heating and heat preservation device 600 according to the set temperature, and the automatic hot air circulation supplement device 650 is automatically opened and closed at a timing during the heating. When the heating reaches the set temperature, the pneumatic double-door device 620 is opened, the free-angle holder 520 clamps the sample 1 to be tested, the first pneumatic proportional valve 511 is controlled according to the set pressure, the first cylinder 512 pushes the sample 1 to the surface of the heat-conducting material 610, the pressure sensor 537 controls the pressure borne by the sample 1, the sample 1 is kept for fine adjustment according to the required loading time, when the set time is reached, the cylinder automatically lifts the sample 1 to separate it from the heat-conducting material 610, when the non-contact set time is reached, the first cylinder 512 pushes the sample 1 to the surface of the heated material again, the temperatures of the surface of the heat-conducting material 610, the upper surface of the sample 1, the middle of the sample 1 and the lower surface of the sample 1 are displayed in real time, and the reciprocating cycle is repeated until the required number of tests is reached. The first cylinder 512 lifts the sample 1 to the initial position, the sample 1 is removed, the heater stops heating, the double-door device 620 is closed, and the test is completed.

[0083] The above-described embodiments of the present application are not to be taken as limiting the scope of the present application. Any modification of structure, equivalent substitutions of means, and improvements thereon which do not depart from the spirit and principles of the present application are to be embraced in the scope of the present application as defined in the following claims.

Claims

1. A conveyor belt testing machine characterized by, The application relates to a vertical type test device for testing the performance of a test sample, which comprises the following components: a base (100); a vertical support (200) installed on the base (100); a cross beam (300) connected with the upper part of the vertical support (200); a vertical column (400) with the top connected with the cross beam (300) and the bottom connected with the base (100); a loading device (500) for supporting the test sample and installed on the cross beam (300) and connected with the vertical column (400) and longitudinally movable along the vertical column (400); a heating and heat-preserving device (600) installed on the base (100) and internally provided with granular heat-conducting materials (610) for testing the performance of the test sample; the loading device (500) comprises a loading part (510) for loading axial load, a free-angle holder (520) for clamping the test sample and a connecting assembly (530) arranged between the loading part (510) and the free-angle holder (520), the top end of the free-angle holder (520) is hingedly connected with the connecting assembly (530), so that the free-angle holder (520) can change the angle during the test of the test sample and realize the test of the test sample in different arc bending states.

2. A conveyor belt testing machine according to claim 1, characterized in that: the connecting assembly (530) comprises: a guide part (531) sleeved on the vertical column (400) and longitudinally movable along the vertical column (400), the guide part (531) is horizontally arranged, and the movable end of the loading part (510) is installed on the guide part (531); a first baffle (532) horizontally arranged and connected with the hinge (534) of the free-angle holder (520) at the bottom; a limiting column (533) for connecting the guide part (531), the first baffle (532) and the free-angle holder (520) together to realize synchronous movement.

3. A conveyor belt testing machine according to claim 2, characterized in that: the loading part (510) comprises a first air cylinder (512) and a first pneumatic proportional valve (511) for adjusting pressure or an electric cylinder (513) and a rack and pinion device (514) for adjusting the rotating speed of the electric cylinder (513).

4. A conveyor belt testing machine according to any one of claims 1 to 3, characterized in that: the free-angle holder (520) comprises an upper clamping plate (521) and a lower clamping plate (522), the top end of the upper clamping plate (521) is hingedly connected with a handle (523), and the handle (523) is used for making the upper clamping plate (521) close to or away from the lower clamping plate (522).

5. A conveyor belt testing machine according to claim 2, characterized in that: a pressing plate (535) is horizontally arranged between the guide part (531) and the first baffle (532), and a pressure sensor (537) for detecting the pressure of the loading part (510) loaded to the free-angle holder (520) is arranged on the upper part of the pressing plate (535).

6. A conveyor belt testing machine according to claim 5, characterized in that: a second baffle (536) is further arranged on the bottom of the pressing plate (535) and has a size larger than that of the pressing plate (535).

7. A conveyor belt testing machine according to claim 5, characterized in that: the heating and heat-preserving device (600) comprises: a box body; a double-door device (620) arranged on the top of the box body; a driving part for driving the double-door device (620) to open and close, and the number of the driving parts is two, and one driving part is connected with each door; a heating assembly (630) arranged in the lower part of the box and used for heating the heat-conducting material (610); and a first temperature sensor (640) arranged in the box and located above the heating assembly (630) and used for detecting the temperature of the heat-conducting material (610); wherein the heat-conducting material (610) is placed in the box and covers the heating assembly (630) and the first temperature sensor (640); one side door of the double-door device (620) is further provided with an automatic hot air circulation supplement device (650). The upper surface, the middle and the lower surface of the sample are each provided with a hole, and a second temperature sensor, a third temperature sensor and a fourth temperature sensor are respectively arranged in the holes.

8. A conveyor belt testing machine according to claim 7, characterized in that: The display part is connected with the pressure sensor (537), the first temperature sensor (640), the second temperature sensor, the third temperature sensor and the fourth temperature sensor, respectively, and is used for collecting and displaying the signals transmitted by the pressure sensor (537), the first temperature sensor (640), the second temperature sensor, the third temperature sensor and the fourth temperature sensor; the control part is connected with the display part, the loading part (510), the driving part and the automatic hot air circulation supplement device (650), respectively, and is used for analyzing and judging the signals transmitted by the display part and controlling the actions of the loading part (510), the driving part and the automatic hot air circulation supplement device (650) according to the received signals.

9. A conveyor belt testing machine according to claim 7, characterized in that: The driving part is provided as a second cylinder (621) and a second pneumatic proportional valve (622) used for adjusting the pressure of the second cylinder (621).

10. A conveyor belt testing machine according to claim 7, characterized in that: The heating assembly (630) comprises a plurality of uniformly arranged heaters, and each heater is externally wrapped with a heat-conducting shell; the automatic hot air circulation supplement device (650) comprises an air duct (652), an air inlet (653) and an air outlet (654), the air duct (652) is provided with a pull rod assembly (655), one end of the pull rod assembly (655) is provided with a sealing element (656), the sealing element (656) is matched with the air inlet (653), a third cylinder (651) drives the pull rod assembly (655) to extend or retract to open or close the air inlet (653), and during operation, hot air passes through the air inlet (653) and the air outlet (654) to form a cold and hot air flow inside the box to automatically supplement the air volume.

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