Vertical queuing calling number machine with LED screen display

Abstract

The application relates to a vertical queuing calling number machine with an LED screen display, which comprises a calling number machine body, an LED display module, a power supply module and the like, further comprising: a vertical through air duct arranged in the calling number machine body, the vertical through air duct being provided with an air inlet and an air outlet; a flow guide partition plate arranged in the vertical through air duct, the vertical through air duct being divided into a first heat dissipation channel and a second heat dissipation channel by the flow guide partition plate, the first heat dissipation channel flowing through a driving circuit area of the LED display module, and the second heat dissipation channel flowing through a heating area of the power supply module; a multi-section speed-regulating fan group, comprising an axial flow fan arranged at the air inlet and a centrifugal fan arranged at the air outlet; the LED display module is fixedly connected with a heat spreading plate, and the heat spreading plate is communicated with the first heat dissipation channel. Through optimization of a heat dissipation structure and air flow organization and combined with the synergistic effect of the multi-section speed-regulating fan group, directional heat dissipation of the LED display module and the power supply module is realized, and the problem that the heat dissipation effect of the existing vertical queuing calling number machine is poor during long-term high-load operation is effectively solved.

Description

Technical Field

[0001] This application relates to the technical field of queuing and calling machines, and in particular to a vertical queuing and calling machine with an LED screen display. Background Technology

[0002] With the continuous improvement of intelligence and informatization in the social service industry, queuing and calling systems have become indispensable intelligent terminal devices in public places such as hospitals, banks, government service halls, and restaurants. Their core function is to optimize the queuing process electronically, thereby improving service efficiency and user experience. In recent years, with the widespread application of LED display technology, traditional queuing and calling machines based on digital tubes or LCD screens have gradually been replaced by vertical queuing and calling machines integrating LED displays. LED displays have advantages such as high brightness, wide viewing angle, vibrant colors, and fast response speed, making them particularly suitable for indoor environments with complex lighting and high pedestrian traffic.

[0003] However, with the popularization and upgrading of LED display technology, especially the application of high-brightness and large-size LEDs in queuing machines, the thermal management problem of the equipment has become increasingly prominent during high-load, high-brightness, and long-term operation.

[0004] Chinese patent application CN202322346390.5 discloses a vertical queuing and calling machine with adjustable function, comprising: a queuing and calling machine body, and an adjusting mechanism at one end of the queuing and calling machine body. This utility model, through the cooperation between the queuing and calling machine body and the adjusting mechanism, without affecting the queuing and calling function of the queuing and calling machine body itself, utilizes the interaction between the movable shell in the adjusting mechanism and the display device, slider, and slide groove. This allows the rotating block to be engaged with the positioning block via a hinge, and the entire assembly to be positioned by bolts. This allows the card reader slot to be covered when not in use and opened via the adjustable movable shell when needed. This prevents dust from entering due to the exposed card reader slot when not in use, and avoids damage to the internal structure due to the screen being fixed to the body and difficult to disassemble for cleaning. To a certain extent, this improves the stability and convenience of the mechanism.

[0005] The aforementioned technologies have the following drawbacks: The enclosed cabinet structure of the vertical queuing and calling machine limits the heat dissipation efficiency and lacks directional heat dissipation measures for key heat source areas. Relying solely on ordinary fans or natural convection makes it difficult to effectively cope with the combined heat generation of the LED screen and power module during long-term high-load operation. This can easily lead to overheating of the screen driving circuit, accelerated brightness decay, and even problems such as local dead lights and color deviation, seriously affecting the stability and service life of the equipment. Utility Model Content

[0006] In order to improve the problem of poor heat dissipation of existing vertical queuing and calling machines during long-term high-load operation, this application provides a vertical queuing and calling machine with an LED screen display.

[0007] The vertical queuing and calling machine with LED screen provided in this application adopts the following technical solution: A vertical queuing and calling machine with an LED screen display includes a calling machine body, an LED display module disposed on the front of the calling machine body, and a power module disposed on one side of the bottom of the calling machine body, and further includes: A vertical ventilation duct is provided inside the queuing machine body and extends along its height direction. The vertical ventilation duct has an air inlet located at the bottom of the queuing machine body and an air outlet located at the top. A flow guide baffle is disposed inside the vertical ventilation channel, dividing the vertical ventilation channel into a first heat dissipation channel and a second heat dissipation channel. The first heat dissipation channel flows through the driving circuit area of ​​the LED display module, and the second heat dissipation channel flows through the heat generation area of ​​the power supply module. A multi-stage variable speed fan assembly, including an axial fan located at the air inlet and a centrifugal fan located at the air outlet; A heat spreader is fixedly connected to the back substrate of the display unit of the LED display module, and the heat spreader is connected to the first heat dissipation channel.

[0008] Furthermore, the heat spreader has multiple heat spreader holes arranged in an array, each heat spreader hole is embedded with a thermal grease column, and the side of the heat spreader facing the first heat dissipation channel is provided with heat dissipation fins.

[0009] Furthermore, the heat dissipation fins have multiple heat dissipation holes at the base of the heat spreader, and the multiple heat dissipation holes are arranged in a one-to-one correspondence with the multiple heat spreader holes, with the extended ends of the thermal grease pillars embedded in the corresponding heat dissipation holes.

[0010] Furthermore, the bottom of the queuing machine body is provided with a heat dissipation base, the heat dissipation base has an installation cavity inside, the installation cavity is filled with a phase change thermal conductive material layer, the center of the heat dissipation base has a hollow area facing the air inlet, and vacuum suction cups are provided at the four corners of the heat dissipation base.

[0011] Furthermore, the multi-segment speed-regulating fan assembly is connected to a temperature control module, and the back substrate of the LED display module and the heating area of ​​the power module are equipped with a temperature sensor group for real-time temperature monitoring and data transmission to the temperature control module.

[0012] Furthermore, the temperature control module is configured to implement a graded start-up strategy for the axial fan and the centrifugal fan.

[0013] Furthermore, both the air inlet and the air outlet are equipped with removable dust filters.

[0014] In summary, the beneficial technical effects of this application are as follows: 1. By setting up vertical cross-flow ventilation channels and flow guide baffles, the heat dissipation paths of the LED display module and the power supply module are physically isolated, forming two independent heat dissipation channels, effectively preventing heat cross-interference. Combined with the synergistic effect of heat dissipation plate, thermal grease pillars, heat dissipation fins and multi-stage speed-regulating fan group, efficient directional heat dissipation of heat source area is achieved, improving the equipment's continuous working ability under high load operation. 2. By combining a heat spreader with an array of heat dissipation holes and thermal grease pillars, the thermal conductivity is further improved and local hot spots are reduced. At the same time, through the structural optimization of the heat dissipation fins and heat dissipation holes, a continuous low thermal resistance heat conduction path is constructed to achieve efficient heat conduction from the heat source to the environment. 3. The phase change thermal conductive material (such as paraffin-based material) inside the heat dissipation base buffers temperature fluctuations through phase change heat absorption / release, extending the heat dissipation response time. The hollow area design utilizes the ground cold source to assist convection, further improving heat dissipation stability. 4. The multi-stage speed-regulating fan group (axial fan + centrifugal fan) is linked with the temperature control module. Based on the real-time temperature data fed back by the temperature sensor group, the fan operation status is dynamically adjusted by adopting a graded start and PID control strategy. This not only achieves efficient heat dissipation under different working conditions, but also effectively controls energy consumption, reduces operating costs, and improves the intelligence level and environmental adaptability of the equipment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 It is along Figure 1 Schematic diagram of the cross-sectional structure along line AA; Figure 3 This is a top view of an embodiment of this application; Figure 4 It is along Figure 3 Schematic diagram of the cross-sectional structure of the middle BB line.

[0016] Explanation of reference numerals in the attached figures: 1. Queue queuing machine body; 11. LED display module; 12. Power supply module; 2. Vertical ventilation duct; 21. Air inlet; 211. Axial fan; 212. Dust filter; 22. Air outlet; 221. Centrifugal fan; 23. Air guide baffle; 24. First heat dissipation channel; 25. Second heat dissipation channel; 3. Heat spreader; 31. Heat spreader hole; 311. Thermal grease pillar; 32. Heat dissipation fins; 321. Heat dissipation hole; 4. Heat dissipation base; 41. Mounting cavity; 411. Phase change thermal conductive material layer; 42. Hollowed-out area; 43. Vacuum suction cup; 5. Temperature control module. Detailed Implementation

[0017] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] This application discloses a vertical queuing and calling machine with an LED screen display. (See also...) Figures 1 to 4 It includes a queuing machine body 1, an LED display module 11 located on the front of the queuing machine body 1, and a power module 12 located on one side of the bottom of the queuing machine body 1. The queuing machine body 1, the LED display module 11, and the power module 12 are existing technologies, which can be fully implemented by those skilled in the art, and will not be described in detail here. It also includes a vertical ventilation duct 2, which is located inside the queuing machine body 1 and extends along its height direction. The vertical ventilation duct 2 has an air inlet 21 located at the bottom of the queuing machine body 1 and an air outlet 22 located at the top, forming a forced convection channel from bottom to top.

[0019] The flow guide baffle 23 is disposed inside the vertical ventilation channel 2, dividing the vertical ventilation channel 2 into a first heat dissipation channel 24 and a second heat dissipation channel 25. The first heat dissipation channel 24 flows through the driving circuit area of ​​the LED display module 11, and the second heat dissipation channel 25 flows through the heat generation area of ​​the power module 12. Through physical isolation, heat is prevented from being cross-conducted between the LED module and the power module 12, and heat sources are avoided from accumulating, thereby improving the overall heat dissipation efficiency.

[0020] The multi-stage adjustable speed fan assembly includes an axial fan 211 located at the air inlet 21 and a centrifugal fan 221 located at the air outlet 22. The adjustable speed axial fan 211 is used as the air intake drive source, and its axial airflow characteristics are consistent with the direction of the vertical through-duct 2, which can efficiently introduce external cold air into the air duct. The centrifugal fan 221 at the top generates negative pressure, which accelerates the discharge of hot air. Its radial airflow characteristics can effectively overcome the space limitations at the top of the equipment and prevent hot air backflow.

[0021] A heat dissipation plate 3 is fixedly connected to the back substrate of the display unit of the LED display module 11. The heat dissipation plate 3 is made of a high thermal conductivity material such as copper, aluminum or graphene composite material. It is tightly attached to the back substrate of the display unit of the LED display module 11 by thermally conductive adhesive. The heat dissipation plate 3 is connected to the first heat dissipation channel 24.

[0022] In this way, when the queuing machine body 1 is cooled, the axial fan 211 is turned on, introducing external cool air into the vertical ventilation duct 2. When the airflow flows through the first heat dissipation channel 24, forced convection carries away the heat from the surface of the heat spreader 3, achieving rapid cooling of the LED display module 11. During this process, the heat-generating area of ​​the power module 12 is completely isolated from the LED driver circuit area through the second heat dissipation channel 25, preventing the high temperature generated by power components such as electrolytic capacitors and switching transistors from interfering with the LED driver circuit. Furthermore, the centrifugal fan 221 at the top is turned on, forming a pressure difference drive mode with the axial fan 211: the higher the speed of the centrifugal fan 221, the greater the negative pressure in the air duct, thereby drawing more cool air in from the bottom, forming a closed-loop heat dissipation cycle. This vertical queuing machine, through optimized heat dissipation structure and airflow organization, combined with the coordinated control of multi-stage speed-adjustable fan groups, achieves directional heat dissipation of the LED display module 11 and the power module 12, providing effective protection for the vertical queuing machine to work continuously for a long time in public places. It effectively improves the problem of poor heat dissipation in existing vertical queuing and calling machines during long-term high-load operation.

[0023] Specifically, refer to Figure 3 and Figure 4 The heat spreader 3 has multiple heat spreader holes 31 arranged in an array, dividing the originally flat surface into multiple interconnected micro-regions. This design further increases the contact area between the heat spreader 3 and the surrounding air and the internal heat-conducting medium. Each heat spreader hole 31 is embedded with a thermal grease pillar 311. Thermal grease itself is a highly thermally conductive filler material, with a thermal conductivity typically between 1 and 10 W / (m·K), much higher than the thermal conductivity of air (approximately 0.026 W / (m·K)). When the heat spreader 3 absorbs heat, the thermal grease pillar 311 can quickly conduct heat from the local area of ​​the heat spreader hole 31 to the entire interior of the heat spreader 3 and to other components in contact with the heat spreader 3, reducing heat accumulation in local areas and making the heat distribution more uniform. The side of the heat spreader 3 facing the first heat dissipation channel 24 is provided with heat dissipation fins 32. The heat dissipation fins 32 adopt a thin sheet structure and are arranged at a certain interval.

[0024] In this way, when the heat spreader 3 conducts heat from the LED display module 11's driving circuit to the heat sink fins 32, causing the temperature of the heat sink fins 32 to rise, the multi-speed adjustable fan group operates, forming a forced convection airflow within the first heat dissipation channel 24. The airflow flows over the surface of the heat sink fins 32 at a certain speed, carrying away the heat from the heat sink fins 32. The faster the airflow speed, the more heat is carried away per unit time. This coupling effect of heat conduction and convection forms a highly efficient heat dissipation system. In this process, the heat spreader holes 31 and thermal grease pillars 311 of the heat spreader 3 enable heat to be quickly and evenly transferred to the heat sink fins 32, while the heat sink fins 32 dissipate heat into the environment through heat exchange with the airflow, thereby achieving effective heat dissipation for the LED display module 11.

[0025] Furthermore, referring to Figure 3 and Figure 4 The heat dissipation fins 32 have multiple heat dissipation holes 321 at their base facing the heat spreader 3. These holes correspond one-to-one with the heat spreader holes 31, creating a continuous heat conduction path from the LED display module 11 driving circuit to the surface of the heat dissipation fins 32 and then to the surrounding environment. This allows heat to directly enter the interior of the heat dissipation fins 32 through the heat spreader holes 31 and 321, reducing thermal resistance and facilitating smoother heat transfer. The extended ends of the thermal grease pillars 311 are embedded in the corresponding heat dissipation holes 321, further enhancing the local thermal conductivity connection between the heat spreader 3 and the heat dissipation fins 32. The thermal grease pillars 311 themselves have good thermal conductivity; after being embedded in the heat dissipation holes 321, they fill the tiny gaps between the heat dissipation holes 321 and the heat spreader holes 31, reducing the presence of low thermal conductivity substances such as air and lowering contact thermal resistance. Through the corresponding design of heat dissipation holes 321 and heat dissipation holes 31, the embedded cooperation of thermal grease pillars 311 and heat dissipation holes 321, and the coordinated work of heat dissipation fins 32 and multi-stage speed-regulating fan groups, the heat transfer efficiency from LED heat source to air is further improved, and local overheating is reduced.

[0026] Furthermore, referring to Figure 1 , Figure 3 and Figure 4The caller unit 1 has a heat dissipation base 4 at its bottom. The heat dissipation base 4 has an internal mounting cavity 41 filled with a phase change thermal conductive material layer 411. This layer is a paraffin-based phase change material, and its phase change temperature range can be flexibly adjusted between 20 and 60°C. The heat dissipation base 4 has a hollowed-out area 42 in the middle, directly facing the air inlet 21. Vacuum suction cups 43 are located at the four corners of the heat dissipation base 4. These suction cups 43 can generate negative pressure to firmly adhere the caller unit to the surface, preventing it from moving or tipping over due to external forces. Additionally, the suction cups 43 also have a certain shock absorption function, reducing the impact of external vibrations on the internal components of the caller unit. When the surface vibrates, the elastic deformation of the suction cups 43 can absorb some of the vibration energy, reducing the intensity of the vibration transmitted to the caller unit 1.

[0027] When the LED display module 11, power supply module 12, and other components inside the queuing machine 1 operate, they generate heat, which is transferred to the heat dissipation base 4 through thermal conduction. As heat accumulates, when the phase change thermal conductivity material reaches its phase change temperature point, the material begins to gradually change from a solid to a liquid state. During this process, the phase change thermal conductivity material absorbs a large amount of heat while its own temperature remains essentially constant. This phase change heat absorption process effectively buffers the rapid rise in heat inside the queuing machine, giving the cooling system more time to dissipate heat. When the ambient temperature is low or the queuing machine is operating under low load, the phase change thermal conductivity material gradually releases the absorbed heat, changing back from a liquid to a solid state, completing a full phase change cycle. This reversible phase change process allows the phase change thermal conductivity material to continuously provide heat dissipation and temperature regulation for the queuing machine.

[0028] The hollowed-out area 42 in the middle of the heat dissipation base 4 is directly opposite the air inlet 21 of the call machine body 1. This design optimizes the airflow channel of the entire heat dissipation system. When the multi-speed adjustable fan group is working, outside air enters the inside of the call machine through the air inlet 21. The presence of the hollowed-out area 42 allows the air to enter the area below the heat dissipation base 4 more smoothly. After the air enters, the temperature difference generated by the phase change thermal conductive material layer 411 inside the heat dissipation base 4 after absorbing heat forms a ground-cooled convection, further improving the heat dissipation effect on the LED display module 11.

[0029] Furthermore, referring to Figure 1 and Figure 3The multi-stage speed regulating fan group is connected with a temperature control module 5. A temperature sensor group configured to monitor temperature in real time and transmit data to the temperature control module 5 is arranged on the back substrate of the display unit of the LED display module 11 and in the heating zone of the power module 12. The temperature sensor group adopts digital temperature sensors. For example, a digital temperature sensor is installed at a key heating position on the back substrate of the display unit of the LED display module 11, such as near a chip, which can monitor the temperature change of this area in real time and provide accurate temperature data for the temperature control module 5.

[0030] Meanwhile, referring to Figures 1 to 4 , the temperature control module 5 is configured to control the axial flow fan 211 and the centrifugal fan 221 by implementing a graded start strategy.

[0031] As the core of the entire heat dissipation control system, the temperature control module 5 first receives real-time temperature data transmitted from the temperature sensor group. These data include temperature information of the back substrate of the display unit of the LED display module 11 and the heating zone of the power module 12. The temperature control module 5 is provided with a high-precision signal processing circuit inside, which can perform amplification, filtering and other processing on the received analog temperature signal, and convert it into a digital signal for accurate analysis and judgment.

[0032] The temperature control module 5 compares and analyzes the processed temperature data in real time according to a preset temperature threshold range. It compares the currently monitored temperature with the temperature thresholds corresponding to different gears, so as to determine the gear that the multi-stage speed regulating fan group should operate at. It sets a plurality of temperature thresholds, divides the temperature range into a plurality of intervals, and each interval corresponds to one operating gear of the multi-stage speed regulating fan group. For example, the temperature control module 5 sets three-level temperature thresholds (T1<T2<T3), which correspond to different fan operation modes: low-temperature mode (T<T1): only the centrifugal fan 221 operates at a low speed, the axial flow fan 211 is turned off, and the power consumption is reduced to 15% of the rated value; medium-temperature mode (T1≤T<T2): the centrifugal fan 221 keeps a low speed, the axial flow fan 211 starts at a medium speed, the comprehensive air volume increases by 50%, and the power consumption is controlled at 40% of the rated value; high-temperature mode (T≥T2): both the centrifugal fan 221 and the axial flow fan 211 operate at the maximum rotation speed, and the air volume reaches the peak.

[0033] The temperature control module 5 collects temperature data every 10 seconds, and adjusts the fan rotation speed in real time through a PID algorithm. When the temperature approaches T3, the module preferentially increases the rotation speed of the axial flow fan 211, and uses its large flow characteristic to cool down quickly; when the temperature falls below T2, the rotation speed of the axial flow fan 211 is gradually reduced, so as to avoid energy waste caused by frequent start and stop.

[0034] Once the temperature control module 5 determines the operating speed of the multi-speed adjustable fan assembly, it will drive the fan assembly to adjust its speed by outputting corresponding control signals. The control signals can be pulse width modulation (PWM) signals, which adjust the fan motor speed by changing the duty cycle of the pulses.

[0035] For example, when the fan needs to run at medium speed, the temperature control module 5 outputs a PWM signal with a specific duty cycle. After receiving this signal, the fan motor adjusts its speed according to the duty cycle, thereby achieving precise speed control. This control method features fast response and high speed control accuracy, meeting the heat dissipation requirements of the queuing machine under different working conditions, reducing the overall power consumption of the queuing machine body 1, and achieving energy saving.

[0036] In addition, both the air inlet 21 and the air outlet 22 are equipped with removable dust filters 212. The dust filters 212 employ a multi-layered filter combination of different densities. The outer layer filters out larger dust particles, while the inner layer filters out smaller particles, ensuring both filtration effectiveness and good air permeability. Screw holes are provided around the dust filters 212, and corresponding threaded holes are provided on the frames of the air inlet 21 and the air outlet 22. The dust filters 212 are then securely connected to the frames using screws. The dust filters 212 effectively prevent airborne dust from entering the queuing machine body 1 and accumulating on the surface of the heat dissipation components, thus affecting heat dissipation.

[0037] The implementation principle of a vertical queuing and calling machine with LED screen display in this application embodiment is as follows: When the queuing machine body 1 is cooled, the axial fan 211 is turned on, drawing external cool air into the vertical ventilation duct 2. As the airflow passes through the first heat dissipation channel 24, forced convection carries away the heat from the surface of the heat spreader 3, achieving rapid cooling of the LED display module 11. During this process, the heat-generating area of ​​the power module 12 is completely isolated from the LED driver circuit area through the second heat dissipation channel 25, preventing high temperatures from power components such as electrolytic capacitors and switching transistors from interfering with the LED driver circuit. Furthermore, the centrifugal fan 221 at the top, combined with the axial fan 211, forms a pressure differential drive mode: the higher the speed of the centrifugal fan 221, the greater the negative pressure within the duct, thus drawing more cool air in from the bottom, forming a closed-loop cooling cycle. This vertical queuing machine, through optimized heat dissipation structure and airflow organization, combined with the coordinated control of multi-stage speed-adjustable fan groups, achieves directional heat dissipation for the LED display module 11 and the power module 12, providing effective protection for the vertical queuing machine to operate continuously for extended periods in public places. It effectively improves the problem of poor heat dissipation in existing vertical queuing machines during long-term high-load operation.

[0038] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar terms used in this application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "an" or "a" and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including" and similar terms mean that the elements or objects preceding "comprising" or "including" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vertical queuing and calling machine with an LED screen display, comprising a queuing machine body (1), an LED display module (11) disposed on the front of the queuing machine body (1), and a power supply module (12) on one side of the bottom of the queuing machine body (1), characterized in that, Also includes: A vertical ventilation duct (2) is provided inside the queuing machine body (1) and extends along its height direction. The vertical ventilation duct (2) has an air inlet (21) at the bottom of the queuing machine body (1) and an air outlet (22) at the top. A flow guide baffle (23) is provided inside the vertical ventilation channel (2) to divide the vertical ventilation channel (2) into a first heat dissipation channel (24) and a second heat dissipation channel (25). The first heat dissipation channel (24) flows through the driving circuit area of ​​the LED display module (11), and the second heat dissipation channel (25) flows through the heat generation area of ​​the power supply module (12). The multi-stage variable speed fan assembly includes an axial fan (211) located at the air inlet (21) and a centrifugal fan (221) located at the air outlet (22). The LED display module (11) has a heat dissipation plate (3) fixedly connected to the back substrate of the display unit, and the heat dissipation plate (3) is connected to the first heat dissipation channel (24).

2. A vertical queuing and calling machine with LED screen display according to claim 1, characterized in that, The heat spreader (3) has multiple heat spreader holes (31) arranged in an array. Each heat spreader hole (31) is embedded with a thermal grease column (311). The heat spreader (3) has heat dissipation fins (32) on the side facing the first heat dissipation channel (24).

3. A vertical queuing and calling machine with LED screen display according to claim 2, characterized in that, The heat dissipation fins (32) have multiple heat dissipation holes (321) at the base of the heat spreader (3), and the multiple heat dissipation holes (321) are arranged in a one-to-one correspondence with the multiple heat spreader holes (31). The extended end of the thermal grease column (311) is embedded in the corresponding heat dissipation hole (321).

4. A vertical queuing and calling machine with LED screen display according to claim 1, characterized in that, The bottom of the queuing machine body (1) is provided with a heat dissipation base (4), and the heat dissipation base (4) has an installation cavity (41) inside. The installation cavity (41) is filled with a phase change heat-conducting material layer (411). The heat dissipation base (4) has a hollow area (42) in the middle that faces the air inlet (21). Vacuum suction cups (43) are provided at the four corners of the heat dissipation base (4).

5. A vertical queuing and calling machine with LED screen display according to claim 1, characterized in that, The multi-segment speed-regulating fan group is connected to the temperature control module (5). The back substrate of the display unit of the LED display module (11) and the heating area of ​​the power module (12) are provided with a temperature sensor group for real-time temperature monitoring and data transmission to the temperature control module (5).

6. A vertical queuing and calling machine with LED screen display according to claim 5, characterized in that, The temperature control module (5) is configured to control the axial fan (211) and the centrifugal fan (221) by implementing a graded start-up strategy.

7. A vertical queuing and calling machine with LED screen display according to claim 1, characterized in that, Both the air inlet (21) and the air outlet (22) are equipped with removable dust filters (212).

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