Skylift with load-bearing components

Abstract

The present invention discloses a skylight crane with a load-bearing component, comprising a main frame, an air outlet assembly, and a lifting mechanism. The air outlet assembly is connected to the main frame via the lifting mechanism. The main frame is provided with a load-bearing component, and the air outlet assembly is provided with a lap joint component. The lap joint component and the load-bearing component are movable relative to each other. During the ascent of the air outlet assembly, the load-bearing component and the lap joint component separate. When the air outlet assembly descends to its operating position, the lap joint component overlaps the load-bearing component, and the load-bearing component bears at least part of the weight of the air outlet assembly. The skylight crane with a load-bearing component of the present invention effectively solves the problem of easily damaged lifting mechanisms in skylight cranes in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of air treatment equipment, in particular to a skylight machine with a load-bearing component. Background Art

[0002] Skylight units, also known as ceiling units or ceiling-mounted or embedded air conditioners, are widely used because they save space and are more beautiful.

[0003] Currently, ceiling air conditioners often feature four vents mounted on the frame, which deliver air from the ceiling into the room at a specific angle. This means that air is delivered in four directions along the angles set by the four vents. However, because the airflow from the vents is at a specific angle to the ceiling's horizontal plane, and the airflow direction is limited, when the air conditioner is in cooling mode, the cold air blows directly downward. If someone is near the air conditioner, the cold air will blow directly towards them, reducing comfort.

[0004] In order to solve this problem, there is a ceiling machine with a liftable air outlet assembly. The ceiling machine includes a main frame and an air outlet assembly installed on the ceiling. The air outlet assembly is installed on the main frame through a lifting mechanism. When this ceiling machine is discharging air, the air outlet assembly descends relative to the main frame under the drive of the lifting mechanism. After the air outlet assembly descends, its outer edge and the inner edge of the main frame form a horizontal air outlet, so that the air can be blown horizontally, realizing waterfall-style cooling and improving user comfort.

[0005] However, in order to ensure smooth lifting and lowering movement between the air outlet component and the main frame, a movement gap must be retained between the lifting component and the main frame. Due to the existence of the movement gap, the structure of the prior art does not seal it, and the air outlet will be connected to the return air outlet through the movement gap, which will cause the outlet air to enter the return air outlet through the movement gap, which is likely to cause condensation.

[0006] Moreover, when the air outlet assembly is lowered to the working position, almost all of the gravity of the air outlet assembly is borne by the lifting mechanism. Under normal circumstances, the air outlet assembly is also relatively heavy, so the lifting mechanism is easily damaged. Summary of the Invention

[0007] An embodiment of the present invention provides a roof crane with a load-bearing component to solve the problem that the lifting mechanism of the roof crane in the prior art is easily damaged.

[0008] To achieve the above-mentioned objectives, the present invention provides a ceiling machine with a load-bearing component, including a main frame, an air outlet assembly and a lifting mechanism. The air outlet assembly is connected to the main frame through the lifting mechanism. The main frame is provided with a load-bearing component, and the air outlet assembly is provided with a lap component. The lap component and the load-bearing component can move relative to each other; during the rising process of the air outlet assembly, the load-bearing component and the lap component are separated; when the air outlet assembly descends to the working position, the lap component is overlapped on the load-bearing component, and the load-bearing component at least bears part of the gravity of the air outlet assembly.

[0009] Furthermore, the movement stroke A of the overlapping component is equal to the maximum descending height of the air outlet assembly.

[0010] Furthermore, the maximum lifting distance of the lifting mechanism is greater than the movement stroke of the overlapping component.

[0011] Furthermore, the lifting mechanism includes: a driving device, which is arranged on the main frame; a gear, which is installed on the output shaft of the driving device; a rack, which is fixedly connected to the air outlet assembly, and the rack is engaged with the gear, and the driving device drives the air outlet assembly to rise and fall through the cooperation of the gear and the rack; the engagement length of the rack is equal to the maximum lifting distance of the lifting mechanism.

[0012] Furthermore, the lifting mechanism is installed on the load-bearing component.

[0013] Furthermore, the load-bearing components include a load-bearing plate and a load-bearing step, the load-bearing plate is connected to the main frame, and the load-bearing step is connected to the load-bearing plate; the overlapping components include a overlapping plate and a overlapping step, the overlapping plate is connected to the air outlet assembly, and the overlapping step is connected to the overlapping plate; during the rising process of the air outlet assembly, the overlapping step rises and moves away from the load-bearing step; when the air outlet assembly descends to the working position, the overlapping step descends and overlaps the load-bearing step.

[0014] Furthermore, the load-bearing plate has a first side surface and a second side surface that are arranged opposite to each other; a load-bearing step is formed on the first side surface, and a lifting mechanism is installed on the second side surface.

[0015] Furthermore, the cross-sectional shape of the load-bearing component is C-shaped, and the cross-sectional shape of the overlapping component is L-shaped or T-shaped.

[0016] Furthermore, the air outlet assembly includes an air outlet frame, an air outlet is formed between the air outlet frame and the main frame, and the air outlet frame is raised and lowered independently.

[0017] Furthermore, the air outlet assembly includes an air outlet frame and an air return panel. An air outlet is formed between the air outlet frame and the main frame. The air return panel is provided with a return air outlet. The air outlet frame and the air return panel are connected and rise and fall together.

[0018] Furthermore, the air outlet assembly forms a first air outlet between the assembly and the main frame by descending.

[0019] Furthermore, the air outlet assembly forms an air supply duct between the assembly and the main frame by descending, one end of the air supply duct forms a first air outlet, and the other end of the air supply duct is connected to the air outlet duct of the ceiling machine.

[0020] Furthermore, a second air outlet is provided on the air outlet assembly, and the second air outlet is connected to the air outlet duct of the skylight machine.

[0021] Furthermore, an air guide plate is provided on the air outlet assembly, and the air guide plate is located at the first air outlet and / or the second air outlet.

[0022] Furthermore, the main frame also includes a frame. When the air outlet component descends to form a first air outlet between the main frame, an air supply duct is formed between the air outlet component and the frame. On the installation plane of the main frame, the projection of the air outlet component and the projection of the frame at least partially overlap.

[0023] Furthermore, the skylight machine has a first air outlet mode, a second air outlet mode and a third air outlet mode;

[0024] When the skylight unit is in the first air outlet mode, the first air outlet is open and the second air outlet is closed;

[0025] When the skylight unit is in the second air outlet mode, the first air outlet is open and some or all of the second air outlets are open;

[0026] When the skylight machine is in the third air outlet mode, the first air outlet is closed and some or all of the second air outlets are opened.

[0027] Furthermore, when the ceiling machine is in cooling mode, the ceiling machine is in the first air outlet mode or the second air outlet mode; when the ceiling machine is in heating mode, the ceiling machine is in the third air outlet mode or the second air outlet mode.

[0028] The skylight machine with load-bearing components of the present invention is provided with load-bearing components and overlapping components. When the air outlet component is lowered to the working position, the two can cooperate to transfer the gravity of the air outlet component to the main frame. At least part of the gravity of the air outlet component is directly transferred to the main frame through the load-bearing components and the overlapping components, rather than being borne entirely by the lifting mechanism. This greatly reduces the pressure borne by the lifting mechanism during operation, reduces the deformation and stress concentration of the lifting mechanism under pressure, etc., and solves the problem that the lifting mechanism is easily damaged under long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of a roof crane with a load-bearing component according to a first embodiment of the present invention when the air outlet assembly is lowered to a working position;

[0030] Figure 2 1 is a schematic diagram of the internal structure of a roof crane with a load-bearing component according to a first embodiment of the present invention;

[0031] Figure 3 1 is a schematic structural diagram of a lifting mechanism of a roof crane with a load-bearing component according to a first embodiment of the present invention;

[0032] Figure 4 1 is a schematic structural diagram of a ceiling fan with a load-bearing component in a first air outlet mode according to a second embodiment of the present invention;

[0033] Figure 5 It is a structural schematic diagram of a ceiling machine with a load-bearing component in the second air outlet mode according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0034] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0035] In view of the fact that almost all the gravity of the air outlet assembly of the ceiling machine in the prior art is borne by the lifting mechanism, in order to reduce the gravity borne by the lifting mechanism and prevent it from being easily damaged due to excessive pressure, the present invention provides the following embodiments to solve the problem.

[0036] See also Figures 1 to 3 As shown, according to the first embodiment of the present invention, a ceiling machine with a load-bearing component is provided, including a main frame 10, an air outlet assembly 20 and a lifting mechanism 30. The air outlet assembly 20 is connected to the main frame 10 via the lifting mechanism 30. The air outlet assembly 20 forms a first air outlet 41 between the main frame 10 and the main frame 10 by descending. The main frame 10 is provided with a load-bearing component 11, and the air outlet assembly 20 is provided with a lap joint component 21. The lap joint component 21 and the load-bearing component 11 can move relative to each other. During the ascent of the air outlet assembly 20, the load-bearing component 11 separates from the lap joint component 21; when the air outlet assembly 20 descends to the working position, the lap joint component 21 overlaps the load-bearing component 11, and the load-bearing component 11 at least bears part of the weight of the air outlet assembly 20.

[0037] The skylight machine of the present invention is provided with a load-bearing component 11 and a lap component 21. When the air outlet assembly is lowered to the working position, the two can cooperate to transfer the gravity of the air outlet assembly 20 to the main frame 10. At least part of the gravity of the air outlet assembly is directly transferred to the main frame through the load-bearing component 11 and the lap component 21, rather than being borne entirely by the lifting mechanism 30. This greatly reduces the pressure borne by the lifting mechanism 30 during operation, reduces the deformation and stress concentration of the lifting mechanism under pressure, and solves the problem that the lifting mechanism is easily damaged under long-term use.

[0038] See also Figure 1, the movement stroke A of the overlapping component 21 is equal to the maximum descending height of the air outlet assembly 20. Since the overlapping component 21 is installed on the air outlet assembly 20 and rises and falls with the air outlet assembly 20, the movement stroke A of the overlapping component 21 is directly related to the maximum descending height of the air outlet assembly 20. In this embodiment, when the air outlet assembly 20 rises to the closed position, the overlapping component 21 rises to the highest position. The distance between the highest position of the overlapping component 21 and the position where the overlapping component 21 overlaps the load-bearing component 11 is A. For details, see Figure 1 Position shown.

[0039] Preferably, the maximum lifting distance of the lifting mechanism 30 is greater than the movement stroke of the overlapping part 21. This is set to ensure that the overlapping part 21 can accurately overlap the load-bearing part 11. When the lifting mechanism 30 controls the air outlet component 20 to descend, the overlapping part 21 also descends. After the movement stroke of the overlapping part 21 is completed, the overlapping part 21 will overlap the load-bearing part 11. At this time, the lifting mechanism 30 will continue to control the air outlet component 20 to descend to ensure that the overlapping part 21 and the load-bearing part 11 are fully matched. Only in this way can the weight of the air outlet component 20 fall on the load-bearing part 11, so as to prevent the lifting distance of the lifting mechanism 30 from being too short to achieve the matching of the overlapping part 21 and the load-bearing part 11.

[0040] See Figure 3 The lifting mechanism 30 includes a driving device 31, a gear 32 and a rack 33. The driving device 31 is arranged on the main frame 10, and the gear 32 is installed on the output shaft of the driving device 31. The rack 33 is fixedly connected to the air outlet assembly 20, and the rack 33 is engaged with the gear 32. The driving device 31 drives the air outlet assembly 20 to rise and fall through the cooperation of the gear 32 and the rack 33. The meshing length of the rack 33 is equal to the maximum lifting distance of the lifting mechanism 30. The meshing length of the rack 33 directly determines the maximum lifting distance of the lifting mechanism 30 (the maximum lifting distance here is the lifting distance that the lifting mechanism 30 can achieve, not the lifting distance after the lifting mechanism 30 is assembled), and thus determines the descending height of the air outlet assembly 20. The specific structure of the lifting mechanism 30 is capable of completing the lifting function. In the process of assembling and manufacturing the product, the maximum lifting distance is adjusted by selecting the structural dimensions.

[0041] It should be noted that the gears and racks form a transmission mechanism, and there can be multiple transmission mechanisms. In this embodiment, there are four transmission mechanisms, which are located at the four corners of the skylight machine to ensure uniform force. Of course, the transmission mechanism can also adopt other methods such as belt drive structure or guide rail structure. In this embodiment, the driving device is a motor, and each motor drives a transmission mechanism. However, the coordination between the motor and the transmission mechanism is not limited to this. In another embodiment not shown in the figure, the other structures are the same as this embodiment, the difference is that one motor drives two transmission mechanisms, thereby reducing the number of motors and reducing costs. Similarly, one motor can also be used to drive four transmission mechanisms to rise and fall at the same time, thereby further saving manufacturing costs.

[0042] To further transfer the weight of the air outlet assembly to the ceiling or the main frame mounted on the ceiling, in this embodiment, the lifting mechanism 30 is mounted on the load-bearing component 11. The weight borne by the lifting mechanism 30 is also borne by the ceiling or the main frame mounted on the ceiling. In particular, when the air outlet assembly of the overhead crane is raised to its highest position, the weight of the air outlet assembly is still borne by the ceiling or the main frame mounted on the ceiling.

[0043] Combine Figure 1 and Figure 2 As shown, the specific structure and coordination of the load-bearing component 11 and the overlapping component 21 are introduced: the load-bearing component 11 includes a load-bearing plate 11a and a load-bearing step 11b, the load-bearing plate 11a is connected to the main frame 10, and the load-bearing step 11b is connected to the load-bearing plate 11a. The overlapping component 21 includes a overlapping plate 21a and a overlapping step 21b, the overlapping plate 21a is connected to the air outlet assembly 20, and the overlapping step 21b is connected to the overlapping plate 21a. During the rising process of the air outlet assembly 20, the overlapping step 21b rises and moves away from the load-bearing step 11b; when the air outlet assembly 20 descends to the working position, the overlapping step 21b descends and overlaps on the load-bearing step 11b. The combination of the overlapping step 21b descending and overlapping on the load-bearing step 11b can realize the above-mentioned overlapping load-bearing function.

[0044] Moreover, in this embodiment, the load-bearing component 11 and the overlapping component 21 are located at the first air outlet, so the combination of the overlapping step 21b descending and overlapping the load-bearing step 11b can also serve as a seal. Specifically, to ensure smooth lifting and lowering movement between the air outlet assembly and the main frame, a movement gap must be maintained between the lifting assembly and the main frame. Due to the existence of this movement gap, the structure of the prior art does not seal this, and the first air outlet will be connected to the return air outlet through the movement gap, which will cause the outlet air to enter the return air outlet through the movement gap, easily causing condensation. When the overlapping step 21b descends and overlaps the load-bearing step 11b, the two are compressed under the action of the weight of the air outlet assembly, that is, there is no gap for ventilation in the middle, thus isolating the air flow between the first air outlet and the return air outlet, achieving a sealing effect. Preferably, thermal insulation cotton is provided on the overlapping surface of the overlapping step 21b and the load-bearing step 11b, which can achieve a better sealing effect and solve the condensation problem.

[0045] The load-bearing plate 11a has a first side surface and a second side surface that are opposite to each other; a load-bearing step 11b is formed on the first side surface, and a lifting mechanism 30 is installed on the second side surface.

[0046] Preferably, the cross-sectional shape of the load-bearing component 11 is C-shaped, and the cross-sectional shape of the overlapping component 21 is L-shaped or T-shaped.

[0047] In this embodiment, the air outlet assembly 20 includes an air outlet frame, a first air outlet 41 is formed between the air outlet frame and the main frame 10, and the air outlet frame is raised and lowered independently. In other embodiments not shown, the air outlet assembly 20 includes an air outlet frame and a return air panel, a first air outlet 41 is formed between the air outlet frame and the main frame 10, and the return air panel is provided with a return air outlet. The air outlet frame and the return air panel are connected and raised and lowered together. The main frame 10 in this embodiment is designed to be mounted on the ceiling and can bear the weight of the ceiling fan.

[0048] See also Figures 4 and 5 As shown, according to the second embodiment of the present invention, a ceiling machine with a load-bearing component is provided, including a main frame 10, an air outlet assembly 20 and a lifting mechanism 30. The air outlet assembly 20 is connected to the main frame 10 by the lifting mechanism. The air outlet assembly 20 forms a first air outlet 41 between the main frame 10 and the main frame 10 by descending. The main frame 10 is provided with a load-bearing component 11, and the air outlet assembly 20 is provided with a lap joint component 21. The lap joint component 21 and the load-bearing component 11 can move relative to each other. During the ascent of the air outlet assembly 20, the load-bearing component 11 separates from the lap joint component 21; when the air outlet assembly 20 descends to the working position, the lap joint component 21 overlaps the load-bearing component 11, and the load-bearing component 11 at least bears part of the weight of the air outlet assembly 20.

[0049] The air outlet assembly 20 descends to form an air supply duct 50 between the main frame 10. One end of the air supply duct 50 forms a first air outlet 41, and the other end of the air supply duct 50 communicates with the air outlet duct of the overhead crane. The air outlet assembly is also provided with a second air outlet 42, which communicates with the air outlet duct of the overhead crane. The air outlet assembly is also provided with an air deflector, which is located at the first air outlet 41 and / or the second air outlet 42.

[0050] The skylight unit has the first, second and third air outlet modes:

[0051] When the skylight machine is in the first air outlet mode, the first air outlet is open and the second air outlet is closed. At this time, the air flow in the air outlet duct is all blown out through the first air outlet, forming a horizontal air outlet or even an oblique upward air outlet. Figure 4 shown.

[0052] When the ceiling fan is in the second air outlet mode, the first air outlet is open, and the second air outlet is open. At this time, part of the air flow in the air outlet duct is blown out through the first air outlet, and the remaining part is blown out through the second air outlet, realizing surround air supply and improving the uniformity of room temperature. Figure 5 shown.

[0053] When the skylight machine is in the third air outlet mode, the first air outlet is closed and the second air outlet is opened. At this time, all the airflow in the air outlet duct is blown out through the second air outlet, forming an oblique downward air outlet or even a vertical downward air outlet.

[0054] The ceiling unit re-plans the heating mode and the cooling mode according to the above air outlet mode. When the ceiling unit is in the cooling mode, the ceiling unit is in the first air outlet mode or the second air outlet mode. When the ceiling unit is in the heating mode, the ceiling unit is in the third air outlet mode or the second air outlet mode.

[0055] The second air outlet not only allows the overhead unit to meet the requirements of diagonally downward or even vertically downward airflow, but also, through the coordination of the first and second air outlets, the overhead unit's airflow patterns can be expanded, thereby increasing the airflow range, the precision of temperature regulation, and the rate of adjustment. The airflow in the outlet duct is guided by the supply duct before being blown out through the first air outlet. The supply duct then directs the vertically downward airflow in the outlet duct into a horizontal direction, or even an upward direction tilted relative to the horizontal plane.

[0056] In the prior art, all ceiling machines use air outlets on the surface facing the ground to discharge air. In order to change the direction of the air outlet, an air guide plate is set at the air outlet to guide the air flow. However, on the installation plane of the ceiling machine, the projection of the air guide plate does not overlap with the projection of the panel of the ceiling machine, resulting in poor airflow guidance effect of the air guide plate, which ultimately reduces the air supply distance of the ceiling machine. In response to the shortcomings of the prior art, the present invention has made improvements. The specific improvements are: the main frame 10 also includes a frame 12. When the air outlet component 20 forms the first air outlet 12 between the main frame 10 by descending, an air supply duct 50 is formed between the air outlet component 20 and the frame 12. On the installation plane of the main frame 10, the projection of the air outlet component 20 at least partially overlaps with the projection of the frame 12. The frame 12 is the part installed on the ceiling. When the projection of the air outlet assembly coincides with the projection of the frame, the air outlet assembly is substantially extended compared to the prior art, so that the horizontal blowing effect of the ceiling machine is good and the air supply distance is increased. When the ceiling machine opens the first air outlet, the air outlet assembly gradually moves away from the main frame to form the air supply duct. At this time, the corresponding part of the air outlet assembly forms the lower side of the air supply duct. When the air flow passes through the air supply duct, the air flow flows in a horizontal direction or even blows out in an upward inclined direction under the guidance of the lower side of the air supply duct, so that the air supply distance of the ceiling machine is increased, thereby achieving the effect of horizontal air outlet.

[0057] As another embodiment, the projection of the air outlet assembly completely overlaps with the projection of the frame. In this case, compared to the case where the projection of the air outlet assembly and the projection of the frame partially overlap, the air outlet assembly can be further extended, thereby improving the horizontal blowing effect of the overhead crane and further increasing the air supply distance. At the same time, when the overhead crane is in the stopped state, the air outlet assembly is attached to the main frame, and the corresponding part of the air outlet assembly is attached to the frame. When observing the overhead crane from the ground, people can only see the air outlet assembly and not the main frame, which effectively improves the aesthetics of the overhead crane.

[0058] As another embodiment, the projection of the air outlet component exceeds the projection of the frame. In this case, compared with the case where the projection of the air outlet component completely coincides with the projection of the frame, the air outlet component can be further extended, thereby further increasing the flat blowing effect and air supply distance of the ceiling machine.

[0059] The ceiling unit has an internal unit part installed in the ceiling, the main frame is connected to the internal unit, the air outlet assembly is connected to the main frame, the internal unit has an internal unit exhaust port, the first end of the air outlet duct of the main frame is connected to the internal unit exhaust port, and the air flow path is: return air port-evaporator-interior unit exhaust port-first end of the air outlet duct-second end of the air outlet duct-blown out through the air outlet.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0061] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0062] Of course, the above are preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the basic principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A ceiling machine with a load-bearing component, comprising a main frame (10), an air outlet assembly (20) and a lifting mechanism (30), wherein the air outlet assembly (20) is connected to the main frame (10) via the lifting mechanism (30), and is characterized in that: A load-bearing component (11) is provided on the main frame (10), and a lap joint component (21) is provided on the air outlet assembly (20), wherein the lap joint component (21) and the load-bearing component (11) are movable relative to each other; During the ascending process of the air outlet assembly (20), the load-bearing component (11) and the overlapping component (21) are separated; When the air outlet assembly (20) descends to the working position, the overlapping component (21) overlaps the load-bearing component (11), and the load-bearing component (11) bears at least part of the weight of the air outlet assembly (20); The load-bearing component (11) comprises a load-bearing plate (11a) and a load-bearing step (11b), wherein the load-bearing plate (11a) is connected to the main frame (10), and the load-bearing step (11b) is connected to the load-bearing plate (11a); The overlapping component (21) comprises an overlapping plate (21a) and an overlapping step (21b), the overlapping plate (21a) is connected to the air outlet assembly (20), and the overlapping step (21b) is connected to the overlapping plate (21a); During the ascending process of the air outlet assembly (20), the overlapping step (21b) ascends and moves away from the load-bearing step (11b); when the air outlet assembly (20) descends to the working position, the overlapping step (21b) descends and overlaps the load-bearing step (11b).

2. The overhead crane according to claim 1, characterized in that: The movement stroke A of the overlapping component (21) is equal to the maximum descending height of the air outlet component (20).

3. The overhead crane according to claim 2, characterized in that: The maximum lifting distance of the lifting mechanism (30) is greater than the movement stroke of the overlapping component (21).

4. The overhead crane according to claim 3, characterized in that: The lifting mechanism (30) comprises: A driving device (31) is provided on the main frame (10); A gear (32) mounted on the output shaft of the driving device (31); A rack (33) is fixedly connected to the air outlet assembly (20), the rack (33) is meshed with the gear (32), and the driving device (31) drives the air outlet assembly (20) to rise and fall through the cooperation of the gear (32) and the rack (33); The meshing length of the rack (33) is equal to the maximum lifting distance of the lifting mechanism (30).

5. The overhead crane according to claim 4, characterized in that: The lifting mechanism (30) is mounted on the load-bearing component (11).

6. The overhead crane according to claim 1, characterized in that: The load-bearing plate (11a) has a first side surface and a second side surface that are arranged opposite to each other; The load-bearing step (11b) is formed on the first side surface, and the lifting mechanism (30) is installed on the second side surface.

7. The overhead crane according to claim 1, characterized in that: The cross-sectional shape of the load-bearing component (11) is C-shaped, and the cross-sectional shape of the overlapping component (21) is L-shaped or T-shaped.

8. The overhead crane according to claim 1, characterized in that: The air outlet assembly (20) comprises an air outlet frame, a first air outlet (41) is formed between the air outlet frame and the main frame (10), and the air outlet frame is independently raised and lowered.

9. The overhead crane according to claim 1, characterized in that: The air outlet assembly (20) comprises an air outlet frame and an air return panel, a first air outlet (41) is formed between the air outlet frame and the main frame (10), the air return panel is provided with an air return port, and the air outlet frame and the air return panel are connected and rise and fall together.

10. The overhead crane according to claim 1, characterized in that: The air outlet assembly (20) forms a first air outlet (41) between the assembly and the main frame (10) by descending.

11. The overhead crane according to claim 10, characterized in that: The air outlet assembly (20) forms an air supply duct (50) between the main frame (10) by descending, one end of the air supply duct (50) forms a first air outlet, and the other end of the air supply duct (50) is connected to the air outlet duct of the ceiling machine.

12. The overhead crane according to claim 11, characterized in that: The air outlet assembly (20) is further provided with a second air outlet (42), and the second air outlet (42) is communicated with the air outlet duct of the ceiling machine.

13. The overhead crane according to claim 12, characterized in that: An air guide plate is provided on the air outlet assembly (20), and the air guide plate is located at the first air outlet (41) and / or the second air outlet (42).

14. The overhead crane according to claim 12, characterized in that: The main frame (10) further includes a frame (12); when the air outlet assembly (20) is lowered to form the first air outlet (41) between the main frame (10), the air supply duct (50) is formed between the air outlet assembly (20) and the frame (12); and on the installation plane of the main frame (10), the projection of the air outlet assembly (20) and the projection of the frame (12) at least partially overlap.

15. The overhead crane according to claim 12, characterized in that: The skylight machine has a first air outlet mode, a second air outlet mode and a third air outlet mode; When the skylight machine is in the first air outlet mode, the first air outlet (41) is opened and the second air outlet (42) is closed; When the skylight machine is in the second air outlet mode, the first air outlet (41) is opened, and part or all of the second air outlets (42) are opened; When the skylight machine is in the third air outlet mode, the first air outlet (41) is closed, and some or all of the second air outlets (42) are opened.

16. The overhead crane according to claim 15, characterized in that: When the overhead unit is in cooling mode, the overhead unit is in the first air outlet mode or the second air outlet mode; When the skylight unit is in the heating mode, the skylight unit is in the third air outlet mode or the second air outlet mode.

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