Loading vehicle assisting in climbing stairs

Abstract

The invention relates to the technical field of electrical equipment tools, in particular to an auxiliary stair-climbing loading vehicle. The stair climbing robot comprises a carrier, a stair climbing mechanism and a posture changing mechanism. The carrier is rotationally connected with rollers; the stair climbing mechanism is rotationally connected with the carrying frame through a lifting mechanism, and the stair climbing mechanism is used for interacting with stair steps to lift a carrying vehicle; the posture changing mechanism is connected with the stair climbing mechanism and connected with the carrier so that the carrier and the stair climbing mechanism can rotate relative to each other or keep the state of the carrier and the stair climbing mechanism. The lifting process can be avoided, and the method is suitable for heavy-load transportation occasions of hydraulic power plants.

Description

Technical Field

[0001] This application relates to the field of power equipment and tools technology, specifically to an auxiliary stair-climbing cargo vehicle. Background Technology

[0002] A stair climber is a device that assists in climbing stairs and is widely used in moving items in buildings without elevators. Chinese invention patent CN109969244A discloses a stair climber that uses a climbing mechanism that interacts with stair steps to raise the base frame, and then uses a manual lifting device to climb one stair step at a time. While this type of stair climber meets the needs of light-load use in daily life, in a hydroelectric power plant environment, workers often need to vertically move heavy goods such as electrical equipment and steel tools. Lifting the entire device during the climb is not advisable, as it requires multiple people working together. Uneven force distribution can easily cause the device to tip over, leading to safety accidents. Summary of the Invention

[0003] This application addresses the problem that existing stair-climbing machines are not suitable for heavy-duty applications by providing an auxiliary stair-climbing cargo vehicle. By rotating the stair-climbing mechanism and the cargo rack, the rollers on the cargo rack move laterally to reach the steps, eliminating the need to lift the entire cargo vehicle.

[0004] This application is achieved through the following technical solution:

[0005] A stair-climbing cargo vehicle includes:

[0006] A shelf, wherein the shelf is rotatably connected to casters;

[0007] A stair-climbing mechanism, which is rotatably connected to the cargo rack via a lifting mechanism, is used to interact with stair steps to lift the cargo vehicle;

[0008] A posture transformation mechanism is provided, which is connected to the stair-climbing mechanism and the carrying frame, so that the carrying frame and the stair-climbing mechanism can rotate relative to each other or maintain a certain state.

[0009] The auxiliary stair-climbing cargo vehicle provided in this application, through the setting of the posture transformation mechanism, when the cargo frame of the cargo vehicle is lifted by the stair-climbing mechanism so that the height of the rollers is equivalent to that of the step, the posture transformation mechanism acts on the stair-climbing mechanism and the cargo frame, so that the cargo frame and the stair-climbing mechanism can rotate relative to each other, thereby making the rollers on the cargo frame approach the step so as to contact the edge of the step or be located on the upper surface of the step. Then, the stair-climbing mechanism is lifted by the lifting mechanism so that the rollers bear the load. The operator can simply pull the entire cargo vehicle laterally, eliminating the need to lift the entire cargo vehicle manually, which is relatively labor-saving and suitable for heavy-load use environments in hydropower plants.

[0010] In some optional embodiments, the attitude transformation mechanism includes:

[0011] A first connector is connected to the stair-climbing mechanism;

[0012] A limiting rod is movably connected to the first connecting member, and the limiting rod is capable of at least linear reciprocating motion;

[0013] A drive assembly, which is connected to the first connector and is drively connected to the limiting rod to drive the limiting rod to move;

[0014] The second connector is connected to the shelf and has a limiting groove and a clearance groove. When the free end of the limiting rod is located in the limiting groove, the climbing mechanism can linearly translate relative to the shelf under the drive of the lifting mechanism. The limiting rod and the limiting groove form a rotational limit on the shelf and the climbing mechanism. When the free end of the limiting rod is located in the clearance groove, the shelf and the climbing mechanism can rotate relative to each other. The limiting rod and the clearance groove form a linear reciprocating motion limit on the climbing mechanism.

[0015] A buffer assembly is connected to the second connector and is used to abut against the free end of the limiting rod to keep the free end of the limiting rod within the limiting groove.

[0016] In some alternative embodiments, the driving component includes:

[0017] Connecting seat, the connecting seat being connected to the first connecting member;

[0018] An action frame is slidably connected to the connecting seat. The inner side of the action frame has a first rack and a second rack that are positioned opposite each other. The limiting rod is elastically slidably connected to the action frame.

[0019] A rotating component is rotatably connected to the connecting seat and located within the action frame. The rotating component is provided with teeth that can mesh with the first rack, and the central angle corresponding to the teeth is less than 180°.

[0020] A first transmission gear is rotatably connected to the connecting seat and can mesh with the toothed portion;

[0021] The second transmission gear is coaxially connected to the first gear to rotate synchronously. The diameter of the second transmission gear is smaller than that of the first transmission gear. The second transmission gear meshes with the second rack.

[0022] The rotating component is connected to the drive source of the stair-climbing mechanism.

[0023] In some optional embodiments, the outer side of the action frame is provided with a plurality of balls by a grooved ball locking process, and the balls are in contact with the connecting seat.

[0024] In some alternative embodiments, the buffer component includes:

[0025] A baffle, which is located in the clearance groove and slides in cooperation with the second connecting member;

[0026] A helical spring, the helical spring being located in the clearance groove, with both ends of the helical spring being connected to the baffle and the second connecting member, respectively;

[0027] The clearance groove has an arc-shaped groove on its wall that is adapted to the helical spring.

[0028] In some optional embodiments, grooves are respectively formed on opposite sides of the baffle to fit into the groove wall of the clearance groove, wherein the groove wall and the bottom of the groove are respectively configured with a number of balls by a groove locking ball process.

[0029] In some optional embodiments, the free end of the limiting rod is rotatably connected to a guide wheel, which is used to contact the wall of the limiting groove and the avoidance groove.

[0030] In some alternative embodiments, a friction layer is disposed on the outer side of the guide wheel.

[0031] In some alternative embodiments, a flexible buffer layer is connected to the end wall of the clearance groove away from the limiting groove.

[0032] In some alternative embodiments, the stair-climbing mechanism includes:

[0033] A support frame, which is connected to the lifting mechanism;

[0034] A drive pulley, which is rotatably connected to the support frame;

[0035] Driven pulley, the driven pulley is rotatably connected to the support frame;

[0036] A timing belt, which is tensioned on the driving pulley and the driven pulley to form a belt drive mechanism, and the outer side of the timing belt is connected with multiple external teeth;

[0037] A stair-climbing drive source, wherein the stair-climbing drive source is connected to the active pulley drive;

[0038] The timing belt is also rotatably connected to multiple rollers, and each external tooth has at least one top pulley on one side. The height of the roller relative to the outer side of the timing belt is lower than the height of the external tooth relative to the outer side of the timing belt.

[0039] Compared with the prior art, this application has the following advantages and beneficial effects:

[0040] The auxiliary stair-climbing cargo vehicle provided in this application, through the setting of the posture transformation mechanism, when the cargo frame of the cargo vehicle is lifted by the stair-climbing mechanism so that the height of the rollers is equivalent to that of the step, the posture transformation mechanism acts on the stair-climbing mechanism and the cargo frame, so that the cargo frame and the stair-climbing mechanism can rotate relative to each other, thereby making the rollers on the cargo frame approach the step so as to contact the edge of the step or be located on the upper surface of the step. Then, the stair-climbing mechanism is lifted by the lifting mechanism so that the rollers bear the load. The operator can simply pull the entire cargo vehicle laterally, eliminating the need to lift the entire cargo vehicle manually, which is relatively labor-saving and suitable for heavy-load use environments in hydropower plants. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the exemplary embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:

[0042] Figure 1 This is a schematic diagram of the auxiliary stair-climbing cargo vehicle structure provided in the embodiments of this application;

[0043] Figure 2 This is a side view of the auxiliary stair-climbing cargo vehicle provided in an embodiment of this application;

[0044] Figure 3 for Figure 1 Enlarged structural diagram at point A in the middle;

[0045] Figure 4 This is a schematic diagram of the driving component structure provided in an embodiment of this application;

[0046] Figure 5 This is a schematic diagram of the buffer component structure provided in an embodiment of this application;

[0047] Figure 6 This is a schematic diagram of the baffle structure provided in an embodiment of this application;

[0048] Figure 7 This is a schematic diagram of the stair-climbing mechanism provided in an embodiment of this application.

[0049] The attached diagram shows the markings and corresponding component names:

[0050] 100-Shelf, 200-Stair-climbing mechanism, 201-Support frame, 202-Driving pulley, 203-Driven pulley, 204-Synchronous belt, 205-External gear, 206-Top holding pulley, 300-Posture changing mechanism, 301-First connecting piece, 302-Limiting rod, 3021-Guide wheel, 303-Drive assembly, 3031-Connecting seat, 3032-Action frame, 3033-Rotating component, 3034-First transmission gear, 3035-Second transmission gear, 304-Second connecting piece, 3041-Limiting groove, 3042-Allowing groove, 305-Helical spring, 306-Baffle, 3061-Slide groove, 307-Flexible buffer layer, 400-Lifting mechanism. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.

[0052] like Figures 1-2 As shown in the figure, this application provides an auxiliary stair-climbing cargo vehicle, which includes a cargo rack 100, a stair-climbing mechanism 200 and a posture transformation mechanism 300.

[0053] The rack 100 has a frame structure. A loading plate is rotatably connected to the rack 100 to facilitate the placement of goods. The rack 100 is rotatably connected to rollers to enable the dragging of the cart. The rollers are located at the bottom of the rack 100, one on each side.

[0054] The stair-climbing mechanism 200 is rotatably connected to the cargo rack 100 via the lifting mechanism 400. The lifting mechanism 400 can be a ball screw mechanism, and the fixed part of the ball screw mechanism is rotatably connected to the cargo rack 100. The stair-climbing mechanism 200 is used to interact with the stair steps to lift the cargo vehicle. In actual implementation, the stair-climbing mechanism 200 can be made to climb using tracks.

[0055] The attitude transformation mechanism 300 is connected to the stair climbing mechanism 200 and the carrying rack 100 so that the carrying rack 100 and the stair climbing mechanism 200 can rotate relative to each other or maintain their state. That is, the attitude transformation mechanism 300 can control whether the stair climbing mechanism 200 and the carrying rack 100 can rotate relative to each other.

[0056] Working principle: When the cargo vehicle is brought close to the first step, the climbing mechanism 200 contacts the step. If the climbing mechanism 200 uses tracks, the track surface contacts the upper surface of the step, pulling the cargo vehicle laterally to a suitable angle. At this point, the relative position of the climbing mechanism 200 and the step is as expected. The attitude transformation mechanism 300 maintains the state of the climbing mechanism 200 and the cargo rack 100, meaning they cannot rotate relative to each other. The climbing mechanism 200 raises the height of the cargo rack 100. When the height of the rollers on the cargo rack 100 is higher than the upper surface of the step, the attitude transformation mechanism 300 causes the climbing mechanism 200 and the cargo rack 100 to rotate relative to each other. At this point, the rack 100 will rotate under the weight of the goods to approach the steps, eventually positioning the rollers on the rack 100 above the steps. The lifting mechanism 400 lowers the rack 100 until the rollers contact the upper surface of the steps. Then, the climbing mechanism 200 is raised until its overall height is higher than the upper surface of the steps. The attitude change mechanism 300 rotates the climbing mechanism 200 to maintain the angle position between the climbing mechanism 200 and the rack 100 before climbing. At this point, the cargo cart is positioned on the steps and supported by the rollers on the rack 100. The cargo cart is pulled laterally to approach the next step. By repeating the above steps, the cargo cart can continuously climb the stairs.

[0057] The auxiliary stair-climbing cargo vehicle provided in this application embodiment, through the setting of the posture transformation mechanism 300, when the cargo rack 100 of the cargo vehicle is lifted by the stair-climbing mechanism 200 so that the height of the rollers is equivalent to the step, the posture transformation mechanism 300 acts on the stair-climbing mechanism 200 and the cargo rack 100, so that the cargo rack 100 and the stair-climbing mechanism 200 can rotate relative to each other, thereby making the rollers on the cargo rack 100 approach the step so as to contact the edge of the step or be located on the upper surface of the step. Then, the lifting mechanism 400 lifts the stair-climbing mechanism 200 so that the rollers bear the load, and the operator can pull the entire cargo vehicle laterally, avoiding the need to lift the entire cargo vehicle manually, which is relatively labor-saving and suitable for heavy-load use environments in hydropower plants.

[0058] In some optional embodiments, the posture transformation mechanism 300 includes a first connecting member 301, a limiting rod 302, a driving assembly 303, a second connecting member 304, and a buffer assembly; the first connecting member 301 is connected to the stair-climbing mechanism 200, and the first connecting member 301 is a plate body serving as a connecting member; the limiting rod 302 is movably connected to the first connecting member 301, and the limiting rod 302 is at least capable of linear reciprocating motion, for example, the limiting rod 302 is slidably connected to the first connecting member 301, and the limiting rod 302 can move back and forth in a straight line, wherein the limiting rod 302 can... The first connecting member 301 is directly or indirectly connected to the first connecting member 301; the drive assembly 303 is connected to the first connecting member 301 and is drivenly connected to the limiting rod 302 to drive the limiting rod 302 to move; the second connecting member 304 is connected to the shelf 100, and the second connecting member 304 has a limiting groove 3041 and a clearance groove 3042. When the free end of the limiting rod 302 is located in the limiting groove 3041, the stair climbing mechanism 200 can be linearly translated relative to the shelf 100 under the drive of the lifting mechanism 400. At this time, the drive mechanism can drive the limiting rod 302 in the limiting groove 3041. The limit rod 302 and the limit groove 3041 move back and forth in the 41 section, forming a rotational limit on the rack 100 and the climbing mechanism 200. When the free end of the limit rod 302 is located in the clearance groove 3042, the rack 100 and the climbing mechanism 200 can rotate relative to each other. The limit rod 302 and the clearance groove 3042 form a linear reciprocating motion limit on the climbing mechanism 200, that is, when the drive mechanism drives the limit rod 302 to move to the junction of the limit groove 3041 and the clearance groove 3042, the rack 100 can move relative to the climbing mechanism 200 under the action of the gravity of the goods. The rollers on the rack 100 are rotated so that they approach the step. The buffer assembly is connected to the second connector 304 and is used to abut the free end of the limiting rod 302 so that the free end of the limiting rod 302 is kept in the limiting groove 3041. In this way, when the rollers on the rack 100 are used as load-bearing components, the buffer assembly can push the limiting rod 302 into the limiting groove 3041. The driving mechanism drives the limiting rod 302 to move so that the limiting groove 3041 cooperates with the limiting rod 302 to form a rotation limit on the climbing mechanism 200 and the rack 100 so as to carry out the next step climbing.

[0059] like Figures 3-5As shown, in some optional embodiments, the drive assembly 303 includes a connecting seat 3031, an actuating frame 3032, a rotating member 3033, a first transmission gear 3034, and a second transmission gear 3035; the connecting seat 3031 is connected to the first connecting member 301, and a sliding groove can be formed on the connecting seat 3031; the actuating frame 3032 is slidably connected to the connecting seat 3031, specifically, the actuating frame 3032 is located in the sliding groove, and the inner side of the actuating frame 3032 has a first rack and a second rack with opposite positions, wherein the limiting rod 302 is elastically slidably connected to the actuating frame 3032; the rotating member 3033 and the connecting seat 3031 are slidably connected to the connecting seat 3032; the actuating frame 3032 is slidably connected to the connecting seat 3031, specifically, the actuating frame 3032 is located in the sliding groove, and the actuating frame 3032 has a first rack and a second rack with opposite positions on its inner side, wherein the limiting rod 302 is elastically slidably connected to the actuating frame 3032; the rotating member 3033 is slidably connected to the connecting seat 3031, the actuating frame 3032, the rotating member 3033, and the rotating member 3033 is slidably connected to the actuating frame 3032 ...4 are slidably connected to the actuating frame 3035, the The connecting seat 3031 is rotatably connected to and located within the action frame 3032. The rotating member 3033 is constructed with teeth that can mesh with the first rack, and the central angle corresponding to the teeth is less than 180°. The first transmission gear 3034 is rotatably connected to the connecting seat 3031 and can mesh with the teeth. The second transmission gear 3035 is coaxially connected to the first gear to rotate synchronously. The diameter of the second transmission gear 3035 is smaller than the diameter of the first transmission gear 3034. The second transmission gear 3035 meshes with the second rack. The rotating member 3033 is connected to the drive source of the stair climbing mechanism 200.

[0060] In this embodiment, the unidirectional rotation of the rotating member 3033 enables the reciprocating motion of the action frame 3032. Therefore, the rotating member 3033 in this embodiment can be directly connected to the drive source of the stair climbing mechanism 200. When the drive source in the stair climbing mechanism 200 is working, the limiting rod 302 moves synchronously in the limiting groove 3041. When the rack 100 is lifted to a predetermined height, the limiting rod 302 is located at the junction of the limiting groove 3041 and the clearance groove 3042. At this time, the rack 100 rotates relative to the stair climbing mechanism 200 so that its rollers are close to the ground. The stair-climbing mechanism 200 is positioned close to and above the steps, reducing the need for a drive source. The lifting and rotating movements of the rack 100 are continuous, improving climbing efficiency. The climbing mechanism 200 is then lifted by the lifting mechanism 400. Because the limit rod 302 is elastically slidably connected to the action frame 3032, the limit rod 302 simultaneously slides elastically on the action frame 3032 as the climbing mechanism 200 is lifted. After the climbing mechanism 200 is lifted to a certain height, the rollers on the rack 100 contact the upper surface of the steps, acting as load-bearing components, further lifting the climbing machine. The structure 200 is arranged so that the entire stair-climbing mechanism 200 is higher than the upper surface of the step. The step will not laterally limit the stair-climbing mechanism 200. At this time, the buffer component pushes the limiting rod 302 back into the limiting groove 3041. That is, the entire stair-climbing mechanism 200 rotates on the carrier 100. Since the limiting rod 302 is not limited by the clearance groove 3042, it will elastically rebound on the action frame 3032. At this time, the limiting rod 302 will be located in the limiting groove 3041 rather than at the junction of the limiting groove 3041 and the clearance groove 3042. Since the diameter of the second transmission gear 3035 is smaller than that of the first transmission gear 3042, the limiting rod 302 will be located in the limiting groove 3041 rather than at the junction of the limiting groove 3041 and the clearance groove 3042. When rotating at the same angle, the second transmission gear 3035 will mesh less times than the first transmission gear 3034. This means that after the teeth mesh with the first transmission gear 3034, the travel of the second rack will be less than the travel of the first rack meshing with the teeth. The travel of the limit rod 302's self-elastic rebound will be used as compensation. The travel of the second rack's movement will allow the limit rod 302 to return to its original position. After the teeth mesh with the first rack again, the limit rod 302 will be able to reach the junction of the limit groove 3041 and the clearance groove 3042.

[0061] In some alternative embodiments, the outer surface of the action frame 3032 is provided with a plurality of balls by a grooved ball locking process, and the balls contact the connecting seat 3031.

[0062] In this embodiment, when the limiting groove 3041 and the limiting rod 302 form a rotational limit on the stair climbing mechanism 200 and the carrying rack 100, when the carrying rack 100 leaves the step or the ground, the carrying rack 100 will generate a large lateral load on the limiting rod 302. This lateral load is transmitted to the action frame 3032, and the action frame 3032 will generate a large contact pressure with the groove wall of the sliding groove of the connecting seat 3031. The setting of the ball makes the action frame 3032 and the groove wall of the sliding groove form rolling friction, which can reduce the bearing pressure on the drive source of the stair climbing mechanism 200.

[0063] like Figure 5 As shown, in some optional embodiments, the buffer assembly includes a baffle 306 and a coil spring 305; the baffle 306 is located in the clearance groove 3042 and slides in cooperation with the second connector 304; the coil spring 305 is located in the clearance groove 3042, and its two ends are respectively connected to the baffle 306 and the second connector 304; wherein, the groove wall of the clearance groove 3042 is provided with an arc-shaped groove adapted to the coil spring 305, so that the coil spring 305 can be prevented from bending outward of the clearance groove 3042 when it extends or retracts.

[0064] It should be noted that after the climbing mechanism 200 is lifted, the line connecting the center of gravity of the climbing mechanism 200 and the upper end is not vertically upward. Therefore, the component force generated by the gravity of the climbing mechanism 200 itself will also cause the climbing mechanism 200 to have a rotational tendency. Combined with the elastic force of the helical spring 305, the climbing mechanism 200 will eventually rotate.

[0065] like Figure 6 As shown, in some optional embodiments, grooves 3061 are respectively formed on opposite sides of the baffle 306 to fit into the groove wall of the clearance groove 3042. The groove wall and bottom of the groove 3061 are respectively equipped with a plurality of balls using a grooved ball locking process. This arrangement improves the smoothness of the sliding of the baffle 306 in the clearance groove 3042. In actual implementation, the second connecting member 304 also has arc-shaped slides on both sides of the extension direction of the clearance groove 3042. These arc-shaped slides are adapted to the balls on the groove wall of the groove 3061, thus ensuring the correct position of the baffle 306 in the clearance groove 3042 and preventing the baffle 306 from becoming misaligned and stuck.

[0066] In some optional embodiments, the free end of the limiting rod 302 is rotatably connected to a guide wheel 3021, which is used to contact the groove walls of the limiting groove 3041 and the clearance groove 3042. This arrangement can improve the smoothness of the movement of the limiting rod 302 in the limiting groove 3041. During the process of lifting the rack 100, the guide wheel 3021 forms rolling friction with the groove wall of the limiting groove 3041, which can reduce relative wear and ensure the structural integrity of the limiting groove 3041.

[0067] In some optional embodiments, a friction layer is provided on the outer side of the guide wheel 3021. This arrangement reduces the relative sliding between the guide wheel 3021 and the groove wall of the limiting groove 3041, thereby reducing wear and further ensuring the structural integrity of the limiting groove 3041. The friction layer can be configured as a rubber ring.

[0068] In some optional embodiments, a flexible buffer layer 307 is connected to the end wall of the clearance groove 3042 away from the limiting groove 3041. When the load on the cargo rack 100 is light, the buffer assembly can directly achieve buffering. When the load on the cargo rack 100 is heavy, the coil spring 305 in the buffer assembly is compressed to its limit, and the flexible buffer layer 307 further buffers the load. This makes the cargo cart suitable for both relatively light and relatively heavy loads. In actual implementation, the coil spring 305 can be set as a leaf spring to prevent it from being compressed and deformed.

[0069] like Figure 7 As shown, in some optional embodiments, the stair-climbing mechanism 200 includes a support frame 201, a drive pulley 202, a driven pulley 203, a synchronous belt 204, and a stair-climbing drive source; the support frame 201 is connected to the lifting mechanism 400; the drive pulley 202 is rotatably connected to the support frame 201; the driven pulley 203 is rotatably connected to the support frame 201; the synchronous belt 204 is tensioned on the drive pulley 202 and the driven pulley 203 to form a belt drive mechanism, and a plurality of external teeth 205 are connected to the outer side of the synchronous belt 204; the stair-climbing drive source is drive-connected to the drive pulley 202; wherein, a plurality of rollers are also rotatably connected to the synchronous belt 204, and each external tooth 205 has at least one top pulley 206 on one side, and the height of the roller relative to the outer side of the synchronous belt 204 is lower than the height of the external tooth 205 relative to the outer side of the synchronous belt 204.

[0070] In this embodiment, when the carrier 100 rotates, the contact pressure between the track and the side of the step is large, which will increase the load on the lifting mechanism 400 and also aggravate the mutual wear between the track and the step. By setting up the roller, the roller can replace the track in contacting the side of the step. At the same time, during the process of lifting the stair climbing mechanism 200, the roller forms rolling friction with the side of the step, which reduces the load on the lifting mechanism 400 and can avoid the mutual wear between the track and the side of the step.

[0071] The specific embodiments described above illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Although the description of this application is presented in conjunction with some embodiments, this does not mean that the features of this application are limited to this embodiment. On the contrary, the purpose of describing the application in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of this application. To provide a thorough understanding of this application, many specific details are included in the above description. This application may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this application, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0072] It should be noted that in this specification, similar reference numerals and letters in the above figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this application, it should be noted that unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0073] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A stair-climbing cargo vehicle, characterized in that, include: A shelf (100) is rotatably connected to rollers; A stair-climbing mechanism (200) is rotatably connected to the cargo rack (100) via a lifting mechanism (400). The stair-climbing mechanism (200) is used to interact with the stair steps to lift the cargo vehicle. A posture transformation mechanism (300) is connected to the stair climbing mechanism (200) and the cargo rack (100) so that the cargo rack (100) and the stair climbing mechanism (200) can rotate relative to each other or maintain their respective states.

2. The auxiliary stair-climbing cargo vehicle according to claim 1, characterized in that, The attitude transformation mechanism (300) includes: The first connector (301) is connected to the stair-climbing mechanism (200); A limiting rod (302) is movably connected to the first connecting member (301), and the limiting rod (302) is capable of at least linear reciprocating motion; A drive assembly (303) is connected to the first connector (301) and is connected to the limiting rod (302) in a transmission manner to drive the limiting rod (302) to move; The second connector (304) is connected to the shelf (100). The second connector (304) has a limiting groove (3041) and a clearance groove (3042). When the free end of the limiting rod (302) is located in the limiting groove (3041), the climbing mechanism (200) can linearly translate relative to the shelf (100) under the drive of the lifting mechanism (400). The limiting rod (302) and the limiting groove (3041) form a rotational limit on the shelf (100) and the climbing mechanism (200). When the free end of the limiting rod (302) is located in the clearance groove (3042), the shelf (100) and the climbing mechanism (200) can rotate relative to each other. The limiting rod (302) and the clearance groove (3042) form a linear reciprocating motion limit on the climbing mechanism (200). A buffer assembly is connected to the second connector (304) and is used to abut against the free end of the limiting rod (302) so that the free end of the limiting rod (302) is held in the limiting groove (3041).

3. The auxiliary stair-climbing cargo vehicle according to claim 2, characterized in that, The drive component (303) includes: Connecting seat (3031), the connecting seat (3031) is connected to the first connecting member (301); Action frame (3032), the action frame (3032) is slidably connected to the connecting seat (3031), the inner side of the action frame (3032) has a first rack and a second rack with opposite positions, wherein the limiting rod (302) is elastically slidably connected to the action frame (3032); Rotating component (3033), the rotating component (3033) is rotatably connected to the connecting seat (3031) and located in the action frame (3032), the rotating component (3033) is constructed with a toothed part that can mesh with the first rack, and the central angle corresponding to the toothed part is less than 180°; The first transmission gear (3034) is rotatably connected to the connecting seat (3031) and can mesh with the toothed part; The second transmission gear (3035) is coaxially connected to the first gear to rotate synchronously. The diameter of the second transmission gear (3035) is smaller than the diameter of the first transmission gear (3034). The second transmission gear (3035) meshes with the second rack. The rotating component (3033) is connected to the drive source of the stair-climbing mechanism (200).

4. The auxiliary stair-climbing cargo vehicle according to claim 3, characterized in that, The outer side of the action frame (3032) is equipped with a number of balls by a grooved ball locking process, and the balls are in contact with the connecting seat (3031).

5. The auxiliary stair-climbing cargo vehicle according to claim 2, characterized in that, The buffer component includes: A baffle (306) is located in the relief groove (3042) and slides in cooperation with the second connector (304); A helical spring (305) is located in the clearance groove (3042), and both ends of the helical spring (305) are connected to the baffle (306) and the second connector (304) respectively. The clearance groove (3042) has an arc-shaped groove on its groove wall that is compatible with the helical spring (305).

6. The auxiliary stair-climbing cargo vehicle according to claim 5, characterized in that, The baffle (306) has grooves (3061) on its opposite sides to fit into the groove wall of the clearance groove (3042). The groove wall and bottom of the groove (3061) are respectively equipped with a number of balls by groove locking ball process.

7. The auxiliary stair-climbing cargo vehicle according to claim 2, characterized in that, The free end of the limiting rod (302) is rotatably connected to a guide wheel (3021), which is used to contact the groove walls of the limiting groove (3041) and the clearance groove (3042).

8. The auxiliary stair-climbing cargo vehicle according to claim 7, characterized in that, The outer side of the guide wheel (3021) is provided with a friction layer.

9. The auxiliary stair-climbing cargo vehicle according to claim 2, characterized in that, A flexible buffer layer (307) is connected to the end wall of the clearance groove (3042) away from the limiting groove (3041).

10. The auxiliary stair-climbing cargo vehicle according to claim 1, characterized in that, The stair-climbing mechanism (200) includes: A support frame (201) is connected to the lifting mechanism (400); A drive pulley (202) is rotatably connected to the support frame (201); Driven pulley (203), the driven pulley (203) is rotatably connected to the support frame (201); A timing belt (204) is tensioned on the driving pulley (202) and the driven pulley (203) to form a belt drive mechanism. Multiple external teeth (205) are connected to the outer side of the timing belt (204). A stair-climbing drive source, wherein the stair-climbing drive source is connected to the drive pulley (202) for transmission; The timing belt (204) is also rotatably connected to multiple rollers. Each external tooth (205) has at least one top pulley (206) on one side. The height of the roller relative to the outer side of the timing belt (204) is lower than the height of the external tooth (205) relative to the outer side of the timing belt (204).

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