Support device for a platform, platform and mechanical device thereof

Abstract

The application discloses a support device for a platform, a platform and a mechanical equipment thereof, and belongs to the field of platform support devices.The support device comprises a linkage assembly, a rotating shaft assembly and a supporting leg assembly; the linkage assembly is connected with a lifting mechanism of the platform and is used for triggering the rotating shaft assembly to rotate in a first direction when the platform is switched from an inclined state to a flat state, and driving the supporting leg assembly to retract; the linkage assembly is also used for not triggering the rotating shaft assembly to rotate in the first direction when the platform is switched from the flat state to the inclined state; and the supporting leg assembly is unfolded under the action of gravity. The greatest advantage of the support device is that: no additional power components are needed, and manual operation is not needed, but linkage with the platform can reduce production cost, avoid delay or error, and greatly improve the safety and stability of the vehicle.

Description

Technical Field

[0001] This invention relates to the field of mechanical equipment, and in particular to a support device for a platform. Background Technology

[0002] Wreckers, as heavy-duty transport vehicles, are commonly used for clearing obstacles on highways and urban roads. Generally, wreckers on the market consist of a frame, lifting device, lifting and towing device, hydraulic system, electronic control system, vehicle body and toolbox, etc., to perform multiple functions such as lifting, pulling and towing.

[0003] In related technologies, such as the utility model patent with application number "201921256678.0", a tow truck tipping platform is disclosed, including a frame, a first linkage rod hinged to the frame at one end, a fixed rod obliquely downward from the frame and fixedly connected, a second linkage rod hinged to the free end of the fixed rod at one end, and a load-bearing plate hinged to the ends of the first and second linkage rods away from the frame. The hinge axis between the first linkage rod and the load-bearing plate is located on the load-bearing surface of the load-bearing plate. The frame, load-bearing plate, first linkage rod, and second linkage rod constitute a four-bar linkage mechanism. The tow truck tipping platform also includes a first hydraulic cylinder hinged to the frame at one end and to the first linkage rod at the other end. After this tow truck was launched on the market, it received widespread attention from customers and sold very well due to its simple structure, low price, and good load-bearing capacity.

[0004] However, when the aforementioned tow trucks are loaded with heavy vehicles, the front wheels of the tow truck are prone to lifting off the ground or even the front of the truck lifting up during the lifting process because the center of gravity of the loaded vehicle is behind the tow truck. This poses a significant safety risk. Therefore, how to solve or improve this technical problem is an urgent issue that needs to be addressed for this type of vehicle. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a support device for a platform, comprising: a linkage assembly; a pivot assembly and a support leg assembly disposed at the rear of the platform frame;

[0006] The linkage component is connected to the lifting mechanism of the platform and is used to trigger the rotating shaft component to rotate in the first direction when the platform switches from an inclined state to a flat state, thereby driving the support leg component to retract.

[0007] The linkage component is also used to prevent the pivot component from rotating in the first direction when the platform switches from a flat state to an inclined state; the support leg component unfolds under its own gravity.

[0008] Furthermore, the support device also includes an elastic component connected to the pivot assembly;

[0009] When the shaft assembly rotates in the first direction, the elastic component is stretched.

[0010] When the platform switches from a flat position to an inclined position, the pivot assembly rotates in the second direction under the elastic restoring force of the elastic component, causing the outrigger assembly to unfold under the action of elastic restoring force and its own gravity.

[0011] Furthermore, the linkage components include trigger blocks mounted on the lifting mechanism of the platform.

[0012] Furthermore, the linkage assembly also includes a linkage rod; one end of the linkage rod is connected to the rear of the platform frame, and the other end is connected to the pivot assembly.

[0013] Furthermore, the pivot assembly includes: a pivot; one end of the pivot is connected to the support leg assembly, and the other end is connected to the linkage assembly.

[0014] Furthermore, the shaft assembly also includes a protrusion; the protruding direction of the protrusion is perpendicular to the rotation direction of the shaft.

[0015] Furthermore, the elastic component is a spring; one end of the spring is fixed, and the other end is connected to the rotating shaft assembly.

[0016] Furthermore, the outrigger assembly includes a mounting base and a movable outrigger rotatably mounted on the mounting base; the upper end face of the movable outrigger is an arc-shaped surface, and the lower end face of the mounting base is a flat surface that mates with the arc-shaped surface, so that when the movable outrigger is retracted, the arc-shaped surface and the flat surface are mutually restrained and abutted.

[0017] On the other hand, the present invention also provides a platform including any of the aforementioned support devices.

[0018] On the other hand, the present invention also provides mechanical equipment, including any of the above-mentioned support devices or platforms.

[0019] The platform support device, platform, and mechanical equipment disclosed in this invention do not simply extend the outrigger assembly to touch the ground, but provide stable support for the platform and the example recovery vehicle, road rescue vehicle, and other mechanical equipment. This effectively solves or improves problems such as front wheel lift-off and wheelie, enhancing the safety and stability of this type of vehicle. Crucially, it achieves linkage between the pivot assembly, elastic assembly, and outrigger assembly and the platform through a mechanical connection via a linkage component, eliminating the need for additional power components and thus reducing implementation costs. Compared to existing technologies using manual or power-driven outriggers, its greatest advantage lies in the elimination of the need for additional hydraulic or pneumatic power components and manual operation. Instead, it links with the platform, reducing production costs, minimizing airflow and other layout requirements, and lowering vehicle weight. Furthermore, it avoids delays or errors caused by power-driven or manual operation that could lead to delayed or unsuccessful outrigger lowering, significantly improving the safety and stability of this type of vehicle. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of one embodiment of the platform exemplified by the present invention;

[0022] Figure 2 This is a schematic diagram of the support device of the present invention in its first state;

[0023] Figure 3 This is a schematic diagram of the support device of the present invention in a second state;

[0024] Figure 4 This is a schematic diagram of the support device of the present invention in the third state;

[0025] Figure 5 This is a schematic diagram of the support device of the present invention in the fourth state;

[0026] Figure 6 This is a schematic diagram of the support leg assembly of the support device of the present invention in the retracted state.

[0027] Figure 7 This is a schematic diagram of the support leg assembly of the support device of the present invention in the deployed state;

[0028] Figure 8 This is a schematic diagram of the support leg assembly of the support device of the present invention in the retracted state.

[0029] Figure 9 This is a schematic diagram of the support leg assembly of the support device of the present invention in the deployed state. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indicators, such as up, down, left, right, front, back, etc., then the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture, as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] This invention proposes a support device for a platform. Examples are provided to illustrate the technical concept of this invention in detail. Figure 1 The platform shown is equipped with the support device of the present invention. It is important to note that this platform is merely an example of adaptability and is not intended to be limiting. The support device of the present invention can be optionally applied to, but is not limited to, the aforementioned platform. Any platform employing the structural concept of the support device of the present invention, providing support during platform lifting and lowering to prevent risks such as tilting, falls within the scope of protection of the present invention. Specifically, Figure 1 The platform shown can be, but is not limited to, a platform for a tow truck, roadside assistance vehicle, etc., and includes a frame 1, a first connecting rod 2, a second connecting rod 3, and a load-bearing plate 4. One end of the first connecting rod 2 is hinged to the end of the frame 1 near the front of the vehicle, and the other end of the first connecting rod 2 is hinged to the end of the load-bearing plate 4 near the front of the vehicle. One end of the second connecting rod 3 is hinged to the end of the frame 1 away from the front of the vehicle, and the other end of the second connecting rod 3 is hinged to the end of the load-bearing plate 4 away from the front of the vehicle. The lifting mechanism formed by the first connecting rod 2 and the second connecting rod 3 can switch the load-bearing plate 4 between a flat and tilted state, for example, when loading and unloading a disabled vehicle. Alternatively, the first connecting rod 2 and the second connecting rod 3 can be connected to a power component to provide power for the switching action, driving the connecting rod to switch the load-bearing plate 4 between a flat and tilted state.

[0034] To prevent the aforementioned platform from easily lifting off the ground or even tilting up due to the weight of the load and the shift of the platform's center of gravity during the transition from a flat to an inclined state, thus posing a safety risk, this invention proposes a support device for the platform, but is not limited to the aforementioned platform.

[0035] Specifically, such as Figure 1 As shown, a specific embodiment of the support device for a platform according to the present invention is given, including a linkage component 10; a pivot assembly 20 and a support leg assembly 40 disposed at the rear of the platform frame;

[0036] The linkage component 10 is connected to the platform's lifting mechanism and is used to trigger the rotating shaft component 20 to rotate in the first direction when the platform switches from an inclined state to a flat state, thereby causing the support leg component 40 to retract; for example, such as Figure 2 As shown, during the process of the platform switching from an inclined state to a flat state, the linkage component 10 triggers the pivot component, which will then drive the support leg component 40 to retract; as Figure 3 As shown, the linkage component 10 continues to move closer to the pivot component 20 as the platform switches, completing the retraction action of the support leg component 40. Figure 2-3 This is for illustrative purposes only and is not intended to be limiting.

[0037] The linkage component 10 is also used to prevent the pivot component 20 from rotating in the first direction when the platform switches from a flat state to an inclined state; the support leg component 40 unfolds under its own gravity; for example, such as Figure 4 As shown in the diagram, at the critical point, the linkage component 10 is about to move away and no longer provides the force to trigger the rotating shaft component 20 to rotate in the first direction, and the support leg component 40 is about to be lowered; as Figure 5 As shown, the linkage mechanism continues to move away as the platform's state changes, completing the outrigger deployment action. Figure 4-5 This is for illustrative purposes only and is not intended to be limiting.

[0038] In this embodiment, a support device for a platform according to the present invention is provided, including a linkage component 10; a pivot assembly 20 and a support leg assembly 40 disposed at the rear of the platform frame. In practical applications, if the platform switches from an inclined state to a flat state, on the one hand, the linkage component 10 moves in tandem with the state change, slowly approaching the pivot assembly 20; on the other hand, the center of gravity of the platform and its load-bearing objects, such as a disabled vehicle, shifts forward as the platform descends, pressing down on the pivot assembly 20; the combined effect of these two actions triggers the pivot assembly 20 to rotate in a first direction. Figure 1As shown, the pivot assembly 20 rotates counterclockwise, but this is not a limitation. For example, if the linkage assembly 10 presses down on the pivot assembly 20 from the other side, the pivot assembly 20 will rotate clockwise, causing the outrigger assembly 40 to automatically retract and no longer support the platform, so that it is in a retracted state and off the ground, avoiding affecting the vehicle's movement. If the platform switches from a flat state to an inclined state, the linkage assembly 10 will switch accordingly and slowly move away from the pivot assembly 20. At the same time, the center of gravity of the platform and the load on the platform, such as a disabled vehicle, will shift backward as the platform rises, no longer providing the force to trigger the pivot assembly 20 to rotate in the first direction. At this time, the pivot assembly 20 can automatically unfold and land under its own weight, in an unfolded state to support the platform, preventing the platform from easily lifting off the ground and causing a tipping risk during the lifting process due to the shift of the load's center of gravity. This further improves the safety and stability of the platform equipment such as the example tow truck and road rescue vehicle.

[0039] As can be seen from the above, the platform for the recovery vehicle of the present invention does not simply provide stable support to the platform and the entire vehicle, such as the recovery vehicle and road rescue vehicle, when the outrigger assembly 40 is in the deployed state and in contact with the ground, effectively solving or improving problems such as front wheel lift-off and wheelie, thus improving the safety and stability of this type of vehicle. The key is that it can achieve linkage between the pivot assembly 20 and the outrigger assembly 40 and the platform through the linkage assembly 10 using a mechanical connection, without the need for additional power components, thereby reducing implementation costs. Compared with the existing technology that uses manual or power-driven outriggers, this invention breaks this operating mode, with the greatest advantage being: no need for additional hydraulic or pneumatic power components, and no need for manual operation, but rather linkage with the platform. This reduces production costs, reduces the layout of air lines, and reduces vehicle weight; it also avoids delays or errors caused by power-driven or manual operation that lead to delayed or unsuccessful outrigger lowering, greatly improving the safety and stability of this type of vehicle. For example, this invention can avoid or improve the technical problem in related technologies where, when loading vehicles such as wreckers and road rescue vehicles with large load capacities, the center of gravity of the loading vehicle is behind the wrecker, causing the front wheels of the wrecker to easily lift off the ground or even the front of the vehicle to lift up during the lifting process. By adding the support device of this invention, the legs automatically extend during loading and automatically retract after loading is completed, which can effectively solve or improve the problem of the front wheels of the wrecker lifting off the ground, and improve its safety and stability to a certain extent.

[0040] Preferably, the support device of the present invention may also optionally include, but is not limited to, an elastic component 30; the rotating shaft assembly 20 is also connected to the elastic component 30, and when the rotating shaft assembly 20 rotates in the first direction, it stretches the elastic component 30; then, if the platform switches from a flat state to an inclined state, the rotating shaft assembly 20 can rotate in the second direction under the elastic restoring force of the elastic component 30. Figure 1As shown, the pivot assembly 20 rotates clockwise, but this is not the only possible rotation. For example, if the linkage assembly 10 presses down on the pivot assembly 20 from the other side, the pivot assembly 20 will rotate counterclockwise, causing the support leg assembly 40 to unfold under the action of elastic restoring force and its own gravity.

[0041] In this embodiment, a spring assembly 30 is added so that when the rotating shaft assembly 20 rotates in the first direction, the elastic assembly 30 can be stretched to the stretched state. When the platform switches from a flat state to an inclined state, the outrigger assembly can not only unfold under its own weight, but also provide the outrigger assembly with the elastic restoring force required for the elastic assembly 30 to return to its original state when it is stretched. This allows the outrigger assembly to unfold under its own weight and the elastic restoring force, which can improve the speed and accuracy of the unfolding and avoid the situation of untimely or incomplete unfolding.

[0042] More specifically, in the preferred embodiment, such as Figure 1-9 As shown, the linkage component 10 may optionally include, but is not limited to, a trigger block 11 mounted on the lifting mechanism of the platform. Specifically, with... Figure 1 Taking the example platform as an example, the linkage component 10 may optionally be, but is not limited to, a trigger block 11 located on the rear lifting mechanism of the platform, i.e., on the second connecting rod 3. More specifically, the trigger block 11 may optionally be, but is not limited to, an arc-shaped protrusion, to make a closer contact with the rotating shaft assembly 20, so as to facilitate its triggering of the rotating shaft assembly 20 to rotate.

[0043] More preferably, the linkage component 10 may also optionally include, but is not limited to, a linkage rod 12; one end of the linkage rod 12 is connected to the rear of the platform frame, and the other end is connected to the pivot assembly 20. For example... Figure 1-5 For example, during the process of switching the platform from an inclined state to a flat state, the trigger block 11 can touch one end of the linkage rod 12, causing the other end of the linkage rod 12 to press down on the pivot assembly, triggering the pivot assembly to rotate, thereby driving the outrigger assembly to retract and lift off the ground; during the process of switching the platform from a flat state to an inclined state, the trigger block 11 gradually moves away from the end in contact with the linkage rod 12 until it disengages from the linkage rod 12, and the other end of the linkage rod 12 no longer provides downward pressure on the pivot assembly 20, so that the pivot assembly 20, under the action of the elastic deformation restoring force of the spring assembly 30, drives the outrigger assembly to unfold and land on the ground to provide support.

[0044] In this embodiment, the linkage component 10 is equipped with a linkage rod 12, which is equivalent to a lever. This increases the distance between the trigger block 11 and the rotating shaft component 20. With this design, the small movement stroke of the trigger block 11 triggering one end of the linkage rod 10 can generate a large movement stroke at the other end of the linkage rod 10 that is much larger than the small movement stroke of the trigger block 11. By utilizing the lever principle and the ingenious idea of ​​shortening the pressing leg stroke, the purpose of quickly extending the leg and delaying the retraction of the leg is achieved. For example, during the process of the platform switching from a flat state to an inclined state, a slight swing can make the outrigger component 40 quickly switch from a retracted state to an extended state. The outrigger component 40 touches the ground to establish support. Therefore, the outrigger component 40 is in the extended state for most of the time during the process of the platform switching from a flat state to an inclined state, which better solves or improves the problem of the front wheels of the clearing vehicle leaving the ground and further improves safety and stability to a certain extent. More importantly, during the process of switching the platform from a tilted state to a flat state, when the center of gravity has shifted forward to a certain extent, that is, when the rear wheels of the vehicle are 20-30 cm off the ground, the pivot assembly 20 can be easily pressed down to quickly retract the legs, avoiding the defect that it is difficult to retract the legs when the rear wheels are still on the ground.

[0045] More preferably, to further enhance the purpose of rapid leg extension and delayed leg retraction, the trigger block 11 is preferably located at the connection point between the linkage rod 12 and the rear of the platform frame.

[0046] More preferably, such as Figure 2 , 6 As shown in Figure -9, the pivot assembly 20 optionally includes, but is not limited to, a pivot 21; one end of the pivot 21 is connected to the support leg assembly 40, optionally but not limited to being integrally formed; the other end is connected to the elastic assembly 30. It is worth noting that... Figure 6 , 7 The specific shape of the rotating shaft shown is only a preferred embodiment and is not limited thereto; a simple rotating shaft structure can be used. Preferably, as... Figure 6 As shown, the rotating shaft assembly 20 also includes a protrusion 22. Preferably, the protrusion direction of the protrusion 22 is perpendicular to the rotation direction of the rotating shaft. On the one hand, this makes it easier for the linkage component 10 to contact the rotating shaft assembly 20 so as to rotate around the protrusion 22 and trigger the rotating shaft assembly 20 to move more quickly; on the other hand, it makes it easier for the elastic component 30 to contact the rotating shaft assembly 20 so as to drive the elastic component 30 to move more quickly. Overall, this improves the response speed of the support device of the present invention and further enhances the stability and safety of the platform.

[0047] More preferably, such as Figure 6-7 As shown, the elastic component 30, which may be, but is not limited to, a spring, has one end fixed and the other end connected to the rotating shaft assembly 20.

[0048] More preferably, such as Figure 2 ,6 As shown in Figure 9, the outrigger assembly 40 may optionally include, but is not limited to, a mounting base 41 and a movable outrigger 42 rotatably mounted on the mounting base 41. Specifically, the outrigger assembly 40 may also optionally include, but is not limited to, a hinge seat 43. The movable outrigger 42 is movably mounted on the mounting base 41 via the hinge seat 43. More preferably, there may be two hinge seats 43, located on either side of the mounting base 41 or the movable outrigger 42. More preferably, the upper end surface of the movable outrigger 42 is an arc-shaped surface, and the lower end surface of the mounting base 41 is a flat surface that mates with the arc-shaped surface, so that when the movable outrigger is retracted, the arc-shaped surface and the flat surface are in a limited abutment position. This matching arc-shaped surface facilitates the rotational engagement between the upper end surface of the movable outrigger 42 and the lower end surface of the mounting base 41, improving the smoothness of movement, and ensuring that the movable outrigger is in a limited abutment position when retracted, preventing it from wobbling.

[0049] More preferably, to improve the support performance of the outrigger assembly 40, in some embodiments of the present invention, a support plate 44 is further provided on the lower end face of the movable outrigger 42. The radial dimension of the support plate 44 is larger than the radial dimension of the movable outrigger 42, so as to obtain a larger force-bearing area, improve the force distribution, and improve the support performance of the outrigger assembly 40. More preferably, the support plate 44 may optionally include, but is not limited to, a horizontal plate, with inclined plates connected to opposite sides of the horizontal plate, and the inclined plates are inclined relative to the horizontal plate toward the movable outrigger 42. Because the movable outrigger 42 needs to go through a process of moving from near the ground to finally touching the ground and unfolding support, or from moving away from the ground to finally leaving the ground and retracting, the support plate 44 includes a horizontal plate and inclined plates on opposite sides of the horizontal plate, and the inclined plates are inclined relative to the horizontal plate toward the movable outrigger 42, which helps to improve the smoothness of the above-mentioned movement process of the movable outrigger 42.

[0050] On the other hand, such as Figure 1 As shown, based on the aforementioned support device, the present invention also provides a platform, including: any of the aforementioned support devices. Preferably, the platform may optionally include, but is not limited to, a frame 1, a first connecting rod 2, a second connecting rod 3, and a load-bearing plate 4; one end of the first connecting rod 2 is hinged to the end of the frame 1 near the front of the vehicle, and the other end of the first connecting rod 2 is hinged to the end of the load-bearing plate 4 near the front of the vehicle; one end of the second connecting rod 3 is hinged to the end of the frame 1 away from the front of the vehicle, and the other end of the second connecting rod 3 is hinged to the end of the load-bearing plate 4 away from the front of the vehicle; the movement of the first connecting rod 2 and the second connecting rod 3 drives the load-bearing plate 4 to switch between a flat state and an inclined state.

[0051] On the other hand, the present invention also provides a mechanical device including any of the aforementioned support devices or platforms. For example, this mechanical device may be, but is not limited to, a tow truck, a roadside assistance vehicle, etc.

[0052] The aforementioned platform and mechanical equipment are created based on the aforementioned support device, and the combination of their technical effects and features will not be elaborated further here. The above are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made using the description and drawings of the present invention within the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A support device for a platform, characterized in that, The support device comprises: a linkage assembly, a rotating shaft assembly and a supporting leg assembly arranged at the rear of the frame of the platform; the linkage assembly is connected with the lifting mechanism of the platform, and is used to trigger the rotating shaft assembly to rotate in a first direction and drive the supporting leg assembly to retract when the platform is switched from the inclined state to the flat state; the linkage assembly is also used to no longer trigger the rotating shaft assembly to rotate in the first direction when the platform is switched from the flat state to the inclined state, and the supporting leg assembly is unfolded under the action of its own gravity; the linkage assembly comprises a trigger block arranged on the lifting mechanism of the platform and a linkage rod, one end of the linkage rod is connected with the rear of the frame of the platform, and the other end is connected with the rotating shaft assembly; the rotating shaft assembly comprises a rotating shaft and a protruding part, one end of the rotating shaft is connected with the supporting leg assembly, and the other end is connected with the linkage assembly; the protruding direction of the protruding part is perpendicular to the rotating direction of the rotating shaft, and the linkage assembly is in contact with the rotating shaft assembly to rotate around the protruding part; the support device further comprises an elastic assembly connected with the rotating shaft assembly; when the rotating shaft assembly rotates in the first direction, the elastic assembly is stretched; when the platform is switched from the flat state to the inclined state, the rotating shaft assembly rotates in a second direction under the elastic restoring force of the elastic assembly, and the supporting leg assembly is unfolded under the action of the elastic restoring force and its own gravity.

2. The support device of claim 1, wherein the elastic assembly is a spring; one end of the spring is fixed, and the other end is connected with the rotating shaft assembly.

3. Support device according to any one of claims 1-2, characterized in that the supporting leg assembly comprises a mounting seat and a movable supporting leg rotatably arranged on the mounting seat; the upper end surface of the movable supporting leg is an arc surface, and the lower end surface of the mounting seat is a flat surface matched with the arc surface, so that the arc surface and the flat surface limit and abut when the movable supporting leg is retracted.

4. A platform characterized by, The support device comprises the support device of any one of claims 1-2.

5. A mechanical device, characterized by The support device comprises the support device of any one of claims 1-2 or the platform of claim 4.

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