A LED display screen cabinet detection device

Abstract

The present invention discloses an LED display box detection device, which relates to the field of display box detection, including a base, an L-shaped frame fixedly connected to the upper end of the base, a hydraulic telescopic rod installed at the upper end of the horizontal part of the L-shaped frame, the telescopic end of the hydraulic telescopic rod passes through the horizontal part of the L-shaped frame, and is fixedly connected to a U-shaped connecting strip, the lower end of the U-shaped connecting strip is fixedly connected to a rectangular plate, the upper end of the rectangular plate is provided with a rectangular groove, the inner bottom of the rectangular groove is provided with a rectangular opening, the width and length of the rectangular opening are both smaller than the width and length of the rectangular groove; a pressure detection mechanism, the pressure detection mechanism includes four support bars fixedly connected to the upper end of the base. The device integrates the pressure resistance performance detection and heat dissipation performance detection of the display box into one, optimizes the detection process, and improves the detection efficiency. In addition, it can simulate the box heat dissipation performance detection in various environments, and improves the overall detection efficiency.

Description

Technical Field

[0001] The invention relates to the field of display screen cabinet detection, and in particular to a LED display screen cabinet detection device. Background Art

[0002] With the rapid development of LED display technology, its application in outdoor advertising, information release, sports events and other fields is becoming more and more extensive. However, since LED displays generate a lot of heat during operation, especially when used for a long time in outdoor environments, its internal temperature will rise significantly, posing a serious threat to the stability and service life of the display. Therefore, the heat dissipation performance test of the display cabinet has become a key link to ensure product quality and reliability.

[0003] Currently, the test of the heat dissipation performance of the display cabinet is simply to use a heating element to heat the inside of the cabinet. This cannot simulate the actual environment in which the display cabinet is used, resulting in a large difference between the test results and the actual use effect. In addition, after the test is completed, the compression performance of the cabinet needs to be tested separately, which needs to be done step by step, resulting in low overall testing efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings existing in the prior art, and to propose a LED display screen cabinet detection device, which integrates the compression performance detection and heat dissipation performance detection of the display screen cabinet, optimizes the detection process, and improves the detection efficiency. In addition, it can simulate the cabinet heat dissipation performance detection in various environments, thereby improving the overall detection efficiency.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A LED display box detection device comprises a base, an upper end of the base is fixedly connected to an L-shaped frame, an upper end of the horizontal part of the L-shaped frame is installed with a hydraulic telescopic rod, the telescopic end of the hydraulic telescopic rod passes through the horizontal part of the L-shaped frame and is fixedly connected to a U-shaped connecting strip, the lower end of the U-shaped connecting strip is fixedly connected to a rectangular plate, the upper end of the rectangular plate is provided with a rectangular groove, the inner bottom of the rectangular groove is provided with a rectangular opening, the width and length of the rectangular opening are both smaller than the width and length of the rectangular groove; a pressure detection mechanism, the pressure detection mechanism comprises a Four support bars, the side surfaces of the four support bars close to the rectangular plate are composed of inclined surfaces and vertical surfaces, rectangular bars are penetrated on the four inner walls of the rectangular groove, each of the rectangular bars is provided with a slide groove on the side close to the support bar, a slidable abutment bar is provided in each slide groove, each abutment bar is elastically connected to the inner wall of the corresponding slide groove on the side away from the corresponding support bar through a first spring, and a pressure plate is fixedly connected to the side of each rectangular bar away from the corresponding support bar; a heat dissipation performance detection mechanism, the heat dissipation performance detection mechanism is used to perform heat dissipation detection on the display screen cabinet.

[0007] Preferably, the heat dissipation performance detection mechanism comprises an electric heating plate installed on the upper end of the base, a mounting column is installed on the upper end of the electric heating plate, and a temperature sensor is installed on the upper end of each mounting column.

[0008] Preferably, a first columnar cavity is opened in the base, a second columnar cavity is opened in the inner bottom of the first columnar cavity, a first piston plate which can slide up and down is arranged in the first columnar cavity, and two connecting rods are symmetrically fixedly connected to the upper end of the first piston plate, the upper ends of the two connecting rods both pass through the inner top of the first columnar cavity, and the upper ends of the two connecting rods are fixedly connected to the lower end of the rectangular plate.

[0009] Preferably, a second piston plate that can slide up and down is provided in the second columnar cavity, and the lower end of the second piston plate is elastically connected to the bottom of the second columnar cavity through a second spring, and the upper end of the base is fixedly connected to a vertical plate, and a cavity and a sliding cavity are provided in the vertical plate, and the sliding cavity is located on the right side of the cavity, and a plurality of first exhaust holes are provided on the right inner wall of the sliding cavity, and the inner top space of the second columnar cavity is connected with the inside of the cavity through a connecting pipe, and the plurality of first exhaust holes all pass through the sliding cavity.

[0010] Preferably, the inner bottom space of the second columnar cavity is connected to the outside through a connecting port, and the inner top space of the second columnar cavity is connected to the outside through an exhaust capillary tube, and the diameter of the exhaust capillary tube is one fifth of that of the connecting tube.

[0011] Preferably, the inner bottom space of the first columnar cavity is connected to the outside through a one-way air inlet, a one-way valve is installed in the one-way air inlet, and the one-way flow direction of the one-way valve is from right to left.

[0012] Preferably, a first conductive block is embedded on both left and right inner walls of the second columnar cavity, a second conductive block is embedded on both left and right inner walls of the second columnar cavity, and a third conductive block is embedded on both left and right inner walls of the second columnar cavity.

[0013] Preferably, a magnetic slide plate that can slide up and down is provided in the sliding cavity, and a plurality of second air exhaust holes are opened on the magnetic slide plate, and the plurality of second air exhaust holes are matched with the plurality of first air exhaust holes, and the upper end of the magnetic slide plate is elastically connected to the inner top of the sliding cavity through a third spring, and the upper end of the vertical plate is installed with a first electromagnet, a second electromagnet and a third electromagnet, the first electromagnet and the third electromagnet have the same magnetic properties after being energized, and the second electromagnet has smaller magnetic properties than the first electromagnet and the third electromagnet after being energized, and a first heating wire and a second heating wire are installed in the cavity, two of the third conductive blocks are used to control the first electromagnet, two of the second conductive blocks are used to control the first heating wire and the second electromagnet, and two of the first conductive blocks are used to control the third electromagnet and the second heating wire.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. Through the design of hydraulic telescopic rod and pressure plate, the device can apply precise and adjustable pressure to the side wall of the display cabinet. This design also realizes the effective limit of the display cabinet, ensures the stability during the detection process, and avoids the influence of the detection result due to the shaking of the cabinet.

[0016] 2. This device can simulate a variety of actual usage environments, including normal temperature without wind, normal temperature with wind, high temperature without wind, and high temperature with wind, to ensure that the heat dissipation performance of the display cabinet in different usage scenarios is comprehensively and accurately evaluated. The flexibility of this environmental simulation greatly improves the comprehensiveness and reliability of the detection.

[0017] 3. Through the intelligent control of components such as the electric heating plate, the first heating wire, and the second heating wire, the overall degree of automation is improved, and frequent manual intervention is unnecessary, which greatly improves the detection efficiency and accuracy.

[0018] 4. The pressure detection mechanism is integrated with the heat dissipation performance detection, which optimizes the overall detection steps and thus achieves the purpose of improving the overall detection efficiency.

[0019] In summary, this device integrates pressure limiting and multiple environmental simulation functions to achieve efficient and accurate display cabinet heat dissipation performance testing, thereby improving overall testing efficiency and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of an LED display screen cabinet detection device proposed by the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure after removing the L-shaped frame;

[0022] Figure 3 for Figure 1 A schematic diagram of the structure of a pressure detection mechanism;

[0023] Figure 4 A partial schematic diagram of a pressure detection mechanism;

[0024] Figure 5 for Figure 4 Schematic cross-sectional view of ;

[0025] Figure 6 for Figure 2 A schematic diagram of the structure without the pressure detection mechanism;

[0026] Figure 7 for Figure 6 Schematic cross-sectional view of ;

[0027] Figure 8 This is a schematic diagram of the cross-sectional structure of one of the vertical plates;

[0028] Fig. 9 It is a structural schematic diagram of the connection between the magnetic slide plate and the third spring.

[0029] In the figure: 1 base, 2 L-shaped frame, 3 hydraulic telescopic rod, 4 U-shaped connecting strip, 5 rectangular plate, 6 support strip, 7 electric heating plate, 8 vertical plate, 9 connecting pipe, 10 rectangular groove, 11 rectangular opening, 12 connecting rod, 13 exhaust capillary, 14 connecting port, 15 one-way air inlet, 16 rectangular strip, 17 moving strip, 18 slide groove, 19 first spring, 20 first exhaust hole, 21 first columnar cavity, 22 first piston plate, 23 second columnar cavity, 24 second spring, 25 second piston plate, 26 first conductive block, 27 second conductive block, 28 third conductive block, 29 first electromagnet, 30 second electromagnet, 31 third electromagnet, 32 cavity, 33 first heating wire, 34 second heating wire, 35 sliding cavity, 36 magnetic slide plate, 37 third spring, 38 second exhaust hole, 39 mounting column, 40 pressing plate. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] Reference Figure 1-Figure 9, a LED display box detection device, including a base 1, an L-shaped frame 2 is fixedly connected to the upper end of the base 1, a hydraulic telescopic rod 3 is installed on the upper end of the horizontal part of the L-shaped frame 2, the telescopic end of the hydraulic telescopic rod 3 passes through the horizontal part of the L-shaped frame 2, and is fixedly connected to a U-shaped connecting strip 4, the lower end of the U-shaped connecting strip 4 is fixedly connected to a rectangular plate 5, a rectangular groove 10 is opened at the upper end of the rectangular plate 5, a rectangular opening 11 is opened at the inner bottom of the rectangular groove 10, the width and length of the rectangular opening 11 are smaller than the width and length of the rectangular groove 10, which corresponds to the display box, and the display box is a box structure with a LED screen groove body installed on the front side;

[0032] As an embodiment of the present invention, it also includes a pressure detection mechanism, which includes four support bars 6 fixedly connected to the upper end of the base 1, and the side surfaces of the four support bars 6 close to the rectangular plate 5 are composed of inclined surfaces and vertical surfaces, and rectangular bars 16 are penetrated on the inner walls of the four sides of the rectangular groove 10, and each rectangular bar 16 is provided with a slide groove 18 on the side close to the support bar 6, and a slidable abutment bar 17 is provided in each slide groove 18, and the side of each abutment bar 17 away from the corresponding support bar 6 is elastically connected to the inner wall of the corresponding slide groove 18 through a first spring 19, and the side of each rectangular bar 16 away from the corresponding support bar 6 is fixedly connected to a pressure plate 40;

[0033] As an embodiment of the present invention, a heat dissipation performance detection mechanism is also included, and the heat dissipation performance detection mechanism is used to perform heat dissipation detection on the display screen box. The heat dissipation performance detection mechanism includes an electric heating plate 7 installed on the upper end of the base 1, and a mounting column 39 is installed on the upper end of the electric heating plate 7. A temperature sensor is installed on the upper end of each mounting column 39, and a wireless module is also provided. The wireless module can transmit the temperature of the temperature sensor to the external display part for judging the actual internal temperature;

[0034] As an embodiment of the present invention, a first columnar cavity 21 is provided in the base 1, a second columnar cavity 23 is provided at the inner bottom of the first columnar cavity 21, a first piston plate 22 which can slide up and down is provided in the first columnar cavity 21, and two connecting rods 12 are symmetrically fixedly connected to the upper end of the first piston plate 22, the upper ends of the two connecting rods 12 both pass through the inner top of the first columnar cavity 21, the upper ends of the two connecting rods 12 are fixedly connected to the lower end of the rectangular plate 5, a second piston plate 25 which can slide up and down is provided in the second columnar cavity 23, and the first piston plate 22 is symmetrically fixedly connected to the upper end of the first piston plate 22. The second piston plate 25 is made of conductive material and has good conductivity. The lower end of the second piston plate 25 is elastically connected to the bottom of the second columnar cavity 23 through the second spring 24. The upper end of the base 1 is fixedly connected with a vertical plate 8. A cavity 32 and a sliding cavity 35 are opened in the vertical plate 8. The sliding cavity 35 is located on the right side of the cavity 32. A plurality of first exhaust holes 20 are opened on the right inner wall of the sliding cavity 35. The inner top space of the second columnar cavity 23 is connected to the inside of the cavity 32 through the connecting pipe 9. The plurality of first exhaust holes 20 all penetrate the sliding cavity 35.

[0035] As an embodiment of the present invention, first conductive blocks 26 are embedded on the left and right inner walls of the second columnar cavity 23, second conductive blocks 27 are embedded on the left and right inner walls of the second columnar cavity 23, third conductive blocks 28 are embedded on the left and right inner walls of the second columnar cavity 23, a magnetic slide plate 36 that can slide up and down is arranged in the sliding cavity 35, a plurality of second exhaust holes 38 are opened on the magnetic slide plate 36, and the plurality of second exhaust holes 38 are matched with the plurality of first exhaust holes 20. The second exhaust holes 38 in the initial position are completely misaligned with the plurality of first exhaust holes 20, resulting in the hole body being in a sealed state, the upper end of the magnetic slide plate 36 is elastically connected to the inner top of the sliding cavity 35 through a third spring 37, the upper end of the vertical plate 8 is installed with a first electromagnet 29, a second electromagnet 30 and a third electromagnet 31, the first electromagnet 29 and the third electromagnet 31 have the same magnetic properties after being energized, the second electromagnet 30 has a smaller magnetic property than the first electromagnet 29 and the third electromagnet 31 after being energized, and the cavity 35 has a plurality of second exhaust holes 38, and the plurality of second exhaust holes 38 are matched with the plurality of first exhaust holes 20. The second exhaust holes 38 in the initial position are completely misaligned with the plurality of first exhaust holes 20, resulting in the hole body being in a sealed state, the upper end of the magnetic slide plate 36 is elastically connected to the inner top of the sliding cavity 35 through a third spring 37, the upper end of the vertical plate 8 is installed with a first electromagnet 29, a second electromagnet 30 and a third electromagnet 31, the first electromagnet 29 and the third electromagnet 31 have the same magnetic properties after being energized, the second electromag 2 is provided with a first heating wire 33 and a second heating wire 34, two third conductive blocks 28 are used to control the first electromagnet 29, two second conductive blocks 27 are used to control the first heating wire 33 and the second electromagnet 30, and two first conductive blocks 26 are used to control the third electromagnet 31 and the second heating wire 34, and also includes an external power supply, the positive pole of the external power supply is electrically connected to the first conductive block 26, the second conductive block 27 and the third conductive block 28 on the right side through three wires, the first conductive block 26, the third electromagnet 31, the second heating wire 34 on the left side are electrically connected to the negative pole of the external power supply in sequence through the wires, the second conductive block 27, the second electromagnet 30, the first heating wire 33 on the left side are electrically connected to the negative pole of the external power supply in sequence through the wires, the third conductive block 28 on the left side, the first electromagnet 29 and the negative pole of the external power supply are electrically connected in sequence through the wires, and the first electromagnet 29, the second electromagnet 30 and the third electromagnet 31 are electrically attracted to the adjacent surface of the magnetic slide plate 36 after being energized;

[0036] As an embodiment of the present invention, the inner bottom space of the second columnar cavity 23 is connected to the outside through the communication port 14, and the inner top space of the second columnar cavity 23 is connected to the outside through the exhaust capillary 13, and the diameter of the exhaust capillary 13 is one fifth of the diameter of the connecting tube 9;

[0037] As an embodiment of the present invention, the inner bottom space of the first columnar cavity 21 is connected to the outside through the one-way air inlet 15. A one-way valve is installed in the one-way air inlet 15, and the one-way flow direction of the one-way valve is from right to left.

[0038] In the present invention, in specific use, the user first places the rectangular display box body with one side of the slot body facing downward into the rectangular slot 10. The heat dissipation outlet of the display box body is generally located at the back side and is not at this time. The four sides of the display box body are respectively in contact with the four pressing plates 40;

[0039] At this time, the staff starts the hydraulic telescopic rod 3 to extend. After the hydraulic telescopic rod 3 is extended, it will drive the rectangular plate 5 to move downward through the U-shaped connecting strip 4. During the downward movement, the rectangular plate 5 will drive multiple rectangular strips 16 to move downward. The downward movement of the rectangular strips 16 will cause the moving strips 17 to move downward. After the moving strips 17 move downward, they will move right along the inclined surface (with Figure 5 The first spring 19 transmits the force to the rectangular bar 16, and finally acts on the side wall of the display box through the pressure plate 40. With the continuous downward movement, the movement amplitude of the moving bar 17 will be further increased, the first spring 19 is compressed to a greater extent, and the force transmitted is greater, so that the pressure of the pressure plate 40 will continue to increase. When the moving bar 17 moves to the vertical plane, it no longer moves horizontally with the downward movement. At this time, the pressure reaches the pressure value to be detected, which can achieve the purpose of pressure detection on the side wall of the display box. In addition, this operation can also limit the display box, and the stability is strong during subsequent detection.

[0040] When the rectangular plate 5 moves down to contact the upper end surface of the base 1, the bottom is sealed, and the electric heating plate 7 and the mounting column 39 are both located inside the display box. At this time, the heat dissipation performance test can be performed after the electric heating plate 7 is powered on for heating. The heating temperature of the electric heating plate 7 is the same as the heating temperature of the existing heating element inside the display.

[0041] During the downward movement of the rectangular plate 5, the first piston plate 22 is driven to move downward through the connecting rod 12. The downward movement speed of the first piston plate 22 is relatively fast, while the exhaust speed of the exhaust capillary 13 is relatively slow. Therefore, the larger air pressure will push the second piston plate 25 to move downward. The downward movement of the second piston plate 25 will compress the second spring 24. When the first piston plate 22 moves downward to the lowest position, the second piston plate 25 will move downward to a position below the third conductive block 28.

[0042] Due to the setting of the exhaust capillary 13, the high-pressure gas in the second columnar cavity 23 will be slowly released, so under the elastic action of the second spring 24, the second piston plate 25 will slowly move up. When the second piston plate 25 moves up to the position of the third conductive block 28, the temperature detected by the temperature sensor simulates the heat dissipation performance of the display box in a windless environment. When the second piston plate 25 moves up to contact the third conductive block 28, the first electromagnet 29 is energized at this time, which will generate a large magnetic force, thereby attracting the magnetic slide plate 36 to move up to the maximum position. At this time, the multiple second exhaust holes 38 just correspond to the first exhaust holes 20, and the hole body is fully opened. The inner top space of the second columnar cavity 23 will enter the cavity 32 through the connecting pipe 9 and be discharged from the hole body. At this time, gas from left to right will be generated above the base 1 and last for a period of time. During this period of time, the heat dissipation performance detection of the box under normal temperature and windy conditions can be simulated;

[0043] When the second piston plate 25 moves up to contact the two second conductive blocks 27, the second electromagnet 30 and the first heating wire 33 are energized. After the second electromagnet 30 is energized, a small amount of processing will be generated. At this time, the multiple second exhaust holes 38 are misaligned with the first exhaust holes 20, so that the hole body is only opened a little, so that the gas in the top space of the second columnar cavity 23 is pressed into the cavity 32 and is slowly released, which will cause a slow gas flow from left to right (almost in a non-flowing state, allowing the high-temperature gas to slowly cover the space above the base 1), simulating the heat dissipation performance test in a high-temperature windless environment;

[0044] When the second piston plate 25 moves up to contact the two first conductive blocks 26, the third electromagnet 31 and the second heating wire 34 are energized. Under the effect of a larger attraction force, the magnetic slide plate 36 moves up to the limit position again, so that the hole body is fully opened, and the heating is started by the second heating wire 34. Therefore, a relatively fast high-temperature airflow is discharged from the hole body, and the high-temperature airflow can simulate the heat dissipation performance test of the box body in a high-temperature windy environment;

[0045] After completing the overall inspection, the hydraulic telescopic rod 3 is started to retract, and the entire body is moved back through the U-shaped connecting strip 4 and the rectangular plate 5. After the return, the first spring 19 will return to its initial un-squeezed state, and the multiple pressure plates 40 will no longer apply pressure to the box body, making it convenient to remove the box body. You only need to remove it and observe the release to see if deformation occurs.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A LED display cabinet detection device, characterized in that: include: A base (1), wherein the upper end of the base (1) is fixedly connected to an L-shaped frame (2), a hydraulic telescopic rod (3) is installed at the upper end of the horizontal portion of the L-shaped frame (2), the telescopic end of the hydraulic telescopic rod (3) passes through the horizontal portion of the L-shaped frame (2) and is fixedly connected to a U-shaped connecting strip (4), the lower end of the U-shaped connecting strip (4) is fixedly connected to a rectangular plate (5), the upper end of the rectangular plate (5) is provided with a rectangular groove (10), the inner bottom of the rectangular groove (10) is provided with a rectangular opening (11), the width and length of the rectangular opening (11) are both smaller than the width and length of the rectangular groove (10); A pressure detection mechanism, the pressure detection mechanism comprising four support bars (6) fixedly connected to the upper end of the base (1), the side surfaces of the four support bars (6) close to the rectangular plate (5) are composed of an inclined surface and a vertical surface, the four inner walls of the rectangular groove (10) are penetrated by rectangular bars (16), each of the rectangular bars (16) is provided with a slide groove (18) on the side close to the support bar (6), each of the slide grooves (18) is provided with a slidable abutment bar (17), the side of each abutment bar (17) away from the corresponding support bar (6) is elastically connected to the inner wall of the corresponding slide groove (18) through a first spring (19), and the side of each rectangular bar (16) away from the corresponding support bar (6) is fixedly connected to a pressure plate (40); A heat dissipation performance detection mechanism, the heat dissipation performance detection mechanism is used to perform heat dissipation detection on a display screen box, the heat dissipation performance detection mechanism comprises an electric heating plate (7) mounted on the upper end of a base (1), a mounting column (39) is mounted on the upper end of the electric heating plate (7), a temperature sensor is mounted on the upper end of each mounting column (39), a first columnar cavity (21) is provided in the base (1), a second columnar cavity (23) is provided at the inner bottom of the first columnar cavity (21), a first piston plate (22) that can slide up and down is provided in the first columnar cavity (21), the upper end of the first piston plate (22) is symmetrically fixedly connected to two connecting rods (12), the upper ends of the two connecting rods (12) both pass through the inner top of the first columnar cavity (21), and the two connecting rods (12) are connected to the upper end of the first piston plate (22). The upper ends of the connecting rods (12) are fixedly connected to the lower ends of the rectangular plates (5); a second piston plate (25) that can slide up and down is provided in the second columnar cavity (23); the lower end of the second piston plate (25) is elastically connected to the bottom of the second columnar cavity (23) via a second spring (24); the upper end of the base (1) is fixedly connected to a vertical plate (8); a cavity (32) and a sliding cavity (35) are provided in the vertical plate (8); the sliding cavity (35) is located on the right side of the cavity (32); a plurality of first exhaust holes (20) are provided on the right inner wall of the sliding cavity (35); the inner top space of the second columnar cavity (23) is connected to the inside of the cavity (32) via a connecting pipe (9); and the plurality of first exhaust holes (20) all penetrate the sliding cavity (35).

2. The LED display cabinet detection device according to claim 1, characterized in that: The inner bottom space of the second columnar cavity (23) is connected to the outside world via the communication port (14), and the inner top space of the second columnar cavity (23) is connected to the outside world via the exhaust capillary (13), wherein the diameter of the exhaust capillary (13) is one fifth of that of the connecting tube (9).

3. The LED display cabinet detection device according to claim 1, characterized in that: The inner bottom space of the first columnar cavity (21) is connected to the outside through a one-way air inlet (15), and a one-way valve is installed in the one-way air inlet (15), and the one-way flow direction of the one-way valve is from right to left.

4. The LED display cabinet detection device according to claim 1, characterized in that: A first conductive block (26) is embedded on both the left and right inner walls of the second columnar cavity (23), a second conductive block (27) is embedded on both the left and right inner walls of the second columnar cavity (23), and a third conductive block (28) is embedded on both the left and right inner walls of the second columnar cavity (23).

5. The LED display cabinet detection device according to claim 4, characterized in that: A magnetic slide plate (36) that can slide up and down is arranged in the sliding cavity (35), and a plurality of second air exhaust holes (38) are opened on the magnetic slide plate (36). The plurality of second air exhaust holes (38) are matched with the plurality of first air exhaust holes (20). The upper end of the magnetic slide plate (36) is elastically connected to the inner top of the sliding cavity (35) through a third spring (37). The upper end of the vertical plate (8) is installed with a first electromagnet (29), a second electromagnet (30) and a third electromagnet (31). The first electromagnet (29) and the third electromagnet (31) are connected to the upper end of the vertical plate (8). The iron (31) has the same magnetic properties after being energized; the second electromagnet (30) has a smaller magnetic properties than the first electromagnet (29) and the third electromagnet (31) after being energized; a first heating wire (33) and a second heating wire (34) are installed in the cavity (32); the two third conductive blocks (28) are used to control the first electromagnet (29); the two second conductive blocks (27) are used to control the first heating wire (33) and the second electromagnet (30); and the two first conductive blocks (26) are used to control the third electromagnet (31) and the second heating wire (34).

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