Self-braking trundle and transport vehicle

Abstract

The self-braking trundle comprises a trundle body and a self-braking mechanism, and the self-braking mechanism comprises a first ratchet wheel and a second ratchet wheel which are connected to an outer ring of a bearing in a spaced mode and are opposite in direction; the first adapter part and the second adapter part are both connected to the inner ring of the supporting ring; the first end of the first stop tooth is rotationally connected to the first adapter part, and the second end of the first stop tooth can be inserted into a tooth groove of the first stop tooth so as to limit rotation of the first ratchet wheel; the third end of the second stop tooth is rotationally connected to the second adapter part, and the fourth end of the second stop tooth can be inserted into a tooth groove of the second stop tooth; one end of the first elastic piece is rotationally connected to the inner ring of the supporting ring, and the other end of the first elastic piece is rotationally connected to the first stop teeth; one end of the second elastic piece is rotationally connected to the inner ring of the supporting ring, and the other end of the second elastic piece is rotationally connected to the second stop teeth. The self-braking caster can achieve automatic braking when the rotating speed of the self-braking caster exceeds the preset speed, and the safety performance of the transport vehicle is greatly improved.

Description

A self-braking caster and transport vehicle Technical Field

[0001] This utility model relates to the field of transportation equipment technology, and in particular to a self-braking caster and a transport vehicle. Background Technology

[0002] In the existing technology, pallet jacks, handcarts and other transport vehicles are equipped with casters. The casters often have foot-operated brakes. When loading or unloading goods, or when the user leaves the transport vehicle, the casters can be locked by the brakes to prevent the transport vehicle from sliding down on its own.

[0003] When locking the caster with a brake, it is generally necessary to step down on the brake, which directly contacts the wheel to generate friction and apply the brake. Lifting the brake upwards will release the wheel from contact with the brake, as in the double-brake swivel caster disclosed in application number 202411737878.3.

[0004] However, for users with poor safety awareness, there may be safety hazards if they do not brake the casters when leaving the transport vehicle, or if they forget to brake the casters. This is especially true when the transport vehicle is parked on a slope without brakes, as the vehicle may slide down the slope too quickly, causing property damage and personal injury.

[0005] Therefore, a caster with a self-braking function is needed to solve the above-mentioned technical problems. Summary of the Invention

[0006] One objective of this invention is to provide a self-braking caster to at least solve one of the aforementioned technical problems.

[0007] To achieve the above objectives, the first aspect of this utility model provides a self-braking caster, including a wheel body. The wheel body includes a support ring, a wheel piece, and a bearing. The support ring is annular, and the wheel piece is connected to the inner ring of the support ring. The center of the wheel piece is connected to the outer ring of the bearing. The self-braking caster further includes a self-braking mechanism, which includes:

[0008] A first ratchet and a second ratchet are axially spaced and connected to the outer ring of the bearing, with the first tooth of the first ratchet and the second tooth of the second ratchet facing opposite directions.

[0009] Both the first and second adapters are connected to the inner ring of the support ring;

[0010] The first stop tooth is located on the radial outer side of the first ratchet. The first end of the first stop tooth is rotatably connected to the first adapter, and the second end can be inserted into the tooth groove of the first stop tooth to restrict the rotation of the first ratchet. The first end and the second end are opposite to each other.

[0011] The second stop tooth is located on the radial outer side of the second ratchet. The third end of the second stop tooth is rotatably connected to the second adapter, and the fourth end can be inserted into the tooth groove of the second stop tooth to restrict the rotation of the second ratchet. The third end and the fourth end are opposite to each other.

[0012] The first elastic element has one end rotatably connected to the inner ring of the support ring and the other end rotatably connected to the first stop tooth. When the rotation speed of the first ratchet is less than the preset speed, the first elastic element can make the second end located outside the tooth groove of the first ratchet. When the rotation speed of the first ratchet is greater than the preset speed, the second end is inserted into the tooth groove of the first ratchet.

[0013] The second elastic element has one end rotatably connected to the inner ring of the support ring and the other end rotatably connected to the second stop tooth. When the rotation speed of the second ratchet is less than the preset speed, the second elastic element can make the fourth end located outside the tooth groove of the second ratchet. When the rotation speed of the second ratchet is greater than the preset speed, the fourth end is inserted into the tooth groove of the second ratchet.

[0014] Optionally, the shape of the second end is the same as the shape of the tooth groove of the first ratchet; and / or

[0015] The shape of the fourth end is the same as the shape of the tooth groove of the second ratchet.

[0016] Optionally, the second end includes a first insertion portion and a first slot, wherein the first insertion portion is capable of inserting into the tooth groove of the first ratchet, and the first tooth is capable of inserting into the first slot; and / or

[0017] The fourth end includes a second insertion part and a second slot, wherein the second insertion part can be inserted into the tooth groove of the second ratchet, and the second tooth can be inserted into the second slot.

[0018] Optionally, the shape of the first insertion portion is the same as the shape of the tooth groove of the first ratchet; and / or

[0019] The shape of the second insertion part is the same as the shape of the tooth groove of the second ratchet.

[0020] Optionally, the first elastic element is a tension spring or a V-shaped spring.

[0021] Optionally, the first ratchet, the wheel, and the second ratchet are arranged sequentially along the axial direction of the bearing.

[0022] Optionally, the self-braking caster further includes a first cover plate and a second cover plate, wherein the first cover plate is disposed on the outside of the first ratchet and the second cover plate is disposed on the outside of the second ratchet.

[0023] Optionally, both the first cover plate and the second cover plate are provided with shaft holes, and / or

[0024] Both the first cover plate and the second cover plate are engaged with the support ring.

[0025] Optionally, both the first and second adapter portions include an adapter plate, a first ear plate, a second ear plate, and a connecting shaft. The adapter plate is connected to the inner ring of the support ring. The first and second ear plates are axially spaced from the adapter plate along the bearing. The connecting shaft is connected to the first and second ear plates. The stop tooth is rotatably connected to the connecting shaft and located between the first and second ear plates; and / or

[0026] At least two first stop teeth are provided at intervals along the circumference of the wheel body, and at least two second stop teeth are provided at intervals along the circumference of the wheel body.

[0027] Another objective of this invention is to provide a transport vehicle that at least solves one of the aforementioned technical problems.

[0028] To achieve this objective, the second aspect of this utility model adopts the following technical solution:

[0029] A transport vehicle includes the aforementioned self-braking casters and a vehicle body, wherein the self-braking casters are connected to the bottom of the vehicle body.

[0030] As can be seen from the above, the technical solution provided by this utility model enables the self-braking caster to automatically brake when its rotation speed exceeds the preset speed. Moreover, the self-braking can be achieved regardless of whether the automatic caster rotates clockwise or counterclockwise, which greatly improves the safety performance of the transport vehicle. Attached Figure Description

[0031] Figure 1 is a schematic diagram of the self-braking caster that rotates clockwise according to an embodiment of the present invention;

[0032] Figure 2 is a schematic diagram of the counterclockwise rotating self-braking caster provided in an embodiment of the present invention;

[0033] Figure 3 is a structural schematic diagram of the self-braking caster provided in an embodiment of the present invention;

[0034] Figure 4 is a schematic diagram of another clockwise rotating self-braking caster provided in an embodiment of the present invention;

[0035] Figure 5 is a schematic diagram of another counterclockwise rotating self-braking caster provided in an embodiment of the present invention.

[0036] In the picture:

[0037] 1. Wheel body; 11. Support ring; 12. Wheel piece; 13. Bearing; 14. Elastic sleeve; 15. Axle;

[0038] 2. First self-braking assembly; 21. First ratchet; 211. First tooth; 22. First adapter; 221. Adapter plate; 222. First ear plate; 223. Second ear plate; 224. Connecting shaft; 23. First stop tooth; 231. First end; 232. Second end; 2321. First insertion part; 2322. First slot; 24. First elastic element;

[0039] 3. Second self-braking assembly; 31. Second ratchet; 311. Second tooth; 32. Second adapter; 33. Second stop tooth; 331. Third end; 332. Fourth end; 3321. Second insertion part; 3322. Second slot; 34. Second elastic element;

[0040] 4. First cover plate; 5. Second cover plate. Detailed Implementation

[0041] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0042] This utility model defines certain directional terms. Unless otherwise stated, the directional terms used, such as "up", "down", "left", "right", "inner", and "outer", are used for ease of understanding and therefore do not constitute a limitation on the scope of protection of this utility model.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] This embodiment provides a transport vehicle, which may include a vehicle body and self-braking casters provided in this embodiment. The self-braking casters are connected to the bottom of the vehicle body. When the vehicle body reaches a preset speed, the self-braking casters can automatically brake, preventing the transport vehicle from traveling too fast and causing property damage or personal injury if the user forgets to brake the casters. It also prevents the transport vehicle from traveling too fast, thus avoiding property damage and personal injury. Especially when the transport vehicle is parked on a slope and the casters are not braked by a downward-pressing brake as in existing technologies, the self-braking casters can prevent the transport vehicle from sliding down too quickly, thus preventing property damage and personal injury.

[0046] The transport vehicle can be any type of vehicle that requires casters, such as a forklift or a handcart. Self-braking casters can improve the safety of the transport vehicle.

[0047] As shown in Figures 1-3, the self-braking caster provided in this embodiment includes a wheel body 1, which includes a support ring 11, a wheel piece 12, and a bearing 13. The support ring 11 is annular, and the wheel piece 12 is connected to the inner ring of the support ring 11. The wheel piece 12 supports the support ring 11 and prevents the support ring 11 from deforming. The center of the wheel piece 12 is connected to the outer ring of the bearing 13. The wheel body 1 may also include an axle 15, and the inner ring of the bearing 13 may be connected to the axle 15. The self-braking caster is connected to the bottom of the vehicle body of the transport vehicle through the axle 15. The wheel body 1 may also include an elastic sleeve 14, which is sleeved on the outside of the support ring 11. The support ring 11 supports the elastic sleeve 14, and the elastic sleeve 14 contacts the ground, which can reduce noise.

[0048] The automatic caster provided in this embodiment also includes a self-braking mechanism, which includes a first self-braking component 2 and a second self-braking component 3. The first self-braking component 2 includes a first ratchet 21, a first connecting part 22, a first stop tooth 23, and a first elastic element 24. The second self-braking component 3 includes a second ratchet 31, a second connecting part 32, a second stop tooth 33, and a second elastic element 34. In this system, the first ratchet 21 and the second ratchet 31 rotate synchronously with the wheel body 1. The first adapter 22 is used to install the first elastic element 24. The first elastic element 24 can keep the first stop tooth 23 outside the tooth groove of the first ratchet 21 (it can be understood that the tooth groove of the first ratchet 21 is the space between two adjacent first teeth 211 of the first ratchet 21, and the tooth groove of the second ratchet 31 is the space between two adjacent second teeth 311 of the second ratchet 31). When the automatic caster rotates rapidly and reaches the preset speed, the first stop tooth 23, under the action of centripetal force, can overcome the tension of the first elastic element 24 and insert into the tooth groove of the first ratchet 21 to brake the first ratchet 21. Since the first ratchet 21 rotates synchronously with the wheel body 1, after the first ratchet 21 is braked, the wheel body 1 is also braked, that is, the automatic caster is braked, thereby braking the transport vehicle. The working principle of the second self-braking assembly 3 is roughly the same as that of the first self-braking assembly 2, and will not be described again here. The difference is that the first self-braking component 2 brakes the self-braking caster that rotates clockwise (or counterclockwise), while the second self-braking component 3 brakes the self-braking caster that rotates counterclockwise (or clockwise).

[0049] Specifically, the first ratchet 21 and the second ratchet 31 are axially spaced on the outer ring of the bearing 13, so the first ratchet 21 and the second ratchet 31 can rotate synchronously with the wheel body 1. The first tooth 211 of the first ratchet 21 and the second tooth 311 of the second ratchet 31 face opposite directions, so the first self-braking assembly 2 can brake the wheel body 1 rotating clockwise (as shown in Figure 1), and the second self-braking assembly 3 can brake the wheel body 1 rotating counterclockwise (as shown in Figure 2), or the first self-braking assembly 2 can brake the wheel body 1 rotating counterclockwise, and the second self-braking assembly 3 can brake the wheel body 1 rotating clockwise. After the self-braking casters are installed on the vehicle body, the vehicle body can achieve self-braking when moving forward and backward.

[0050] As shown in Figures 1-3, both the first adapter 22 and the second adapter 32 are connected to the inner ring of the support ring 11. As shown in Figure 1, the first stop tooth 23 is located on the radially outer side of the first ratchet 21. The first end 231 of the first stop tooth 23 is rotatably connected to the first adapter 22, and the second end 232 can be inserted into the tooth groove of the first stop tooth 23 to restrict the rotation of the first ratchet 21. The first end 231 and the second end 232 are opposite to each other.

[0051] As shown in Figure 2, the second stop tooth 33 is located on the radial outer side of the second ratchet 31. The third end 331 of the second stop tooth 33 is rotatably connected to the second adapter 32, and the fourth end 332 can be inserted into the tooth groove of the second stop tooth 33 to restrict the rotation of the second ratchet 31. The third end 331 and the fourth end 332 are opposite to each other.

[0052] One end of the first elastic element 24 is rotatably connected to the inner ring of the support ring 11, and the other end is rotatably connected to the first stop tooth 23. As shown in Figure 1, the first elastic element 24 is connected between the first end 231 and the second end 232 of the first stop tooth 23, and is close to the edge of the first stop tooth 23. Furthermore, the first elastic element 24 is connected to the side of the first stop tooth 23 away from the first ratchet 21.

[0053] When the rotational speed of the first ratchet 21 is less than the preset speed, the first elastic member 24 can make the second end 232 located outside the tooth groove of the first ratchet 21. When the rotational speed of the first ratchet 21 is greater than the preset speed, the second end 232 is inserted into the tooth groove of the first ratchet 21.

[0054] It is understandable that when the self-braking caster rotates, the first stop tooth 23 will be subjected to a centripetal force. The magnitude of the centripetal force is positively correlated with the rotational speed of the self-braking caster. Under the action of the centripetal force, the second end 232 can rotate around the first end 231. When the rotational speed of the first ratchet 21 is less than the preset speed, under the pulling force of the first elastic member 24, the first stop tooth 23 can be kept outside the tooth groove of the first ratchet 21 (the first stop tooth 23 is shown by the solid line in Figure 1). When the rotational speed of the first ratchet 21 exceeds the preset speed, the centripetal force on the first stop tooth 23 increases, the first elastic member 24 is stretched, and the second end 232 can be inserted into the tooth groove of the first ratchet 21 (the first stop tooth 23 is shown by the dashed line in Figure 1) and make close contact with the first tooth 23 of the first ratchet 21, thereby restricting the rotation of the first ratchet 21 and thus restricting the rotation of the self-braking caster. Understandably, the preset speed can be determined based on the elastic element's ability to resist deformation. The stronger the elastic element's ability to resist deformation, the higher the preset speed; conversely, the weaker the elastic element's ability to resist deformation, the lower the preset speed. Therefore, without affecting the normal operation of the transport vehicle, an elastic element with appropriate resistance to deformation can be selected as needed.

[0055] When it is necessary to release the self-braking caster, the caster can be rotated in the opposite direction to its original movement to release the brake. For example, when the self-braking caster rotates clockwise beyond a preset speed, the first stop tooth 23 inserts into the tooth groove of the first ratchet 21. When it is necessary to release the brake, the caster is rotated counterclockwise, and the first stop tooth 23 can disengage from the tooth groove, thus releasing the brake. At the same time, under the pulling force of the first elastic element 24, the first stop tooth 23 returns to its original position. Conversely, when the self-braking caster rotates counterclockwise beyond a preset speed, the second stop tooth 33 inserts into the tooth groove of the second ratchet 31. When it is necessary to release the brake, the caster is rotated clockwise, and the second stop tooth 33 can gradually disengage from the tooth groove, thus releasing the brake. At the same time, under the pulling force of the second elastic element 34, the second stop tooth 33 returns to its original position. Based on the characteristics of the ratchet teeth, it can be understood that when the first stop tooth 23 is inserted into the tooth groove of the first ratchet 21, the second stop tooth 33 will not be stuck in the tooth groove of the second ratchet 31. Therefore, the self-braking caster can rotate in the opposite direction to its original movement. Similarly, when the second stop tooth 33 is inserted into the tooth groove of the second ratchet 31, the first stop tooth 23 will not be stuck in the tooth groove of the first ratchet 21. Therefore, the self-braking caster can also rotate in the opposite direction to its original movement.

[0056] One end of the second elastic element 34 is rotatably connected to the inner ring of the support ring 11, and the other end is rotatably connected to the second stop tooth 33. When the rotational speed of the second ratchet 31 is less than the preset speed, the second elastic element 34 can make the fourth end 332 located outside the tooth groove of the second ratchet 31 (the second stop tooth 33 shown by the solid line in Figure 2). When the rotational speed of the second ratchet 31 is greater than the preset speed, the fourth end 332 is inserted into the tooth groove of the second ratchet 31 (the second stop tooth 33 shown by the dashed line in Figure 2). The braking process of the second ratchet 31 is similar to that of the second ratchet 31, so it will not be described again.

[0057] The self-braking caster provided in this embodiment can automatically brake when its rotation speed exceeds a preset speed. Moreover, it can automatically brake regardless of whether the caster rotates clockwise or counterclockwise, which greatly improves the safety performance of the transport vehicle.

[0058] As shown in Figure 1, the shape of the second end 232 is the same as the shape of the tooth groove of the first ratchet 21. As shown in Figure 2, the shape of the fourth end 332 is the same as the shape of the tooth groove of the second ratchet 31, so that it can be stably inserted into the tooth groove to achieve effective braking.

[0059] In other alternative embodiments, the first stop tooth 23 can also be of other shapes, as shown in FIG4. The second end 232 includes a first insertion part 2321 and a first slot 2322. When the rotational speed of the wheel body 1 exceeds a preset speed, the first insertion part 2321 can be inserted into the tooth groove of the first ratchet 21, and the first tooth 211 can be inserted into the first slot 2322. Specifically, the tip of the first tooth 211 can be inserted into the first slot 2322. This can distribute the force on the first tooth 211 and the first stop tooth 23, and prevent the first tooth 211 and the first stop tooth 23 from deforming after long-term use.

[0060] As shown in Figure 5, the fourth end 332 includes a second insertion part 3321 and a second slot 3322. The second insertion part 3321 can be inserted into the tooth groove of the second ratchet 31, and the second tooth 311 can be inserted into the second slot 3322. Specifically, the tip of the second tooth 311 can be inserted into the second slot 3322. This can distribute the force on the second tooth 311 and the second stop tooth 33, and prevent the second tooth 311 and the second stop tooth 33 from deforming after long-term use.

[0061] Optionally, the shape of the first insertion portion 2321 is the same as the shape of the tooth groove of the first ratchet 21, which further improves braking stability. The shape of the second insertion portion 3321 is the same as the shape of the tooth groove of the second ratchet 31, which further improves braking stability. Optionally, the tip of the first tooth 211 is inserted into the first slot 2322, and the tip of the second tooth 311 is inserted into the second slot 3322.

[0062] As shown in Figures 1 and 2, optionally, the first elastic element 24 can be a tension spring, and the second elastic element 34 can be a tension spring. Without affecting the normal operation of the transport vehicle, a tension spring with an appropriate elastic coefficient can be selected as needed. Specifically, a hole can be made in the support ring 11 or the first transition part 22 (or the second transition part 23), and the pull ring at one end of the tension spring passes through the hole to achieve a rotatable connection between the tension spring and the support ring 11. A hole is made in the first stop tooth 23 (or the second stop tooth 33), and the pull ring at the other end of the tension spring passes through the hole to achieve a rotatable connection between the tension spring and the first stop tooth 23 (or the second stop tooth 33).

[0063] As shown in Figure 3, optionally, at least two first stop teeth 23 are provided at circumferential intervals along the wheel body 1, and at least two second stop teeth 33 are provided at circumferential intervals along the wheel body 1 to improve braking stability. Correspondingly, each first stop tooth 23 is provided with a first transition portion 22 and a first elastic member 24, and each second stop tooth 33 is provided with a second transition portion 32 and a second elastic member 34. For example, at least two first stop teeth 23 are evenly spaced at circumferential intervals along the wheel body 1, and at least two second stop teeth 33 are evenly spaced at circumferential intervals along the wheel body 1.

[0064] The first ratchet 21, the wheel 12, and the second ratchet 31 are arranged sequentially along the axial direction of the bearing 13 to facilitate the maintenance and disassembly of the self-braking mechanism.

[0065] The self-braking caster also includes a first cover plate 4 and a second cover plate 5. The first cover plate 4 covers the outside of the first ratchet 21, and the second cover plate 5 covers the outside of the second ratchet 31. That is, the first cover plate 4, the first ratchet 21, the second ratchet 31, and the second cover plate 5 are arranged sequentially along the axial direction of the bearing 13. The covers can prevent dust from entering and ensure the effectiveness of self-braking.

[0066] For example, both the first cover plate 4 and the second cover plate 5 are provided with shaft holes, through which the wheel axle 15 can pass to facilitate the connection of the self-braking caster to the vehicle body via the wheel axle 15.

[0067] Optionally, both the first cover plate 4 and the second cover plate 5 are snapped onto the support ring 11. Specifically, the first cover plate 4 and the second cover plate 5 can be made of plastic, with the diameter of the first cover plate 4 and the second cover plate 5 being slightly larger than the inner diameter of the support ring 11. Since plastic is elastic, the first cover plate 4 and the second cover plate 5 can be snapped onto the support ring 11.

[0068] In other alternative embodiments, the first cover plate 4, the wheel 12, and the second cover plate 5 can be connected by bolts.

[0069] As shown in Figure 3, optionally, both the first adapter 22 and the second adapter 32 may include an adapter plate 221, a first ear plate 222, a second ear plate 223, and a connecting shaft 224. The adapter plate 221 is connected to the inner ring of the support ring 11. The first ear plate 222 and the second ear plate 223 are spaced apart from each other along the axial direction of the bearing 13 and connected to the adapter plate 221. The connecting shaft 224 is connected to the first ear plate 222 and the second ear plate 223. A stop tooth is rotatably connected to the connecting shaft 224 and located between the first ear plate 222 and the second ear plate 223. Specifically, the first stop tooth 23 is rotatably connected to the connecting shaft 224 of the first adapter 22, and the second stop tooth 33 is rotatably connected to the connecting shaft 224 of the second adapter 32.

[0070] Optionally, the self-braking caster can also be equipped with a downward-pressing brake, which is existing technology and will not be described in detail here. If a transport vehicle is parked on a slope and the user does not press the brake pedal, the self-braking caster can automatically brake when it rotates to a preset speed, thus preventing property damage and personal injury.

[0071] Although the present invention has been described in detail above with general descriptions, specific embodiments, and experiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A self-braking caster, comprising a wheel body (1), the wheel body (1) comprising a support ring (11), a wheel piece (12), and a bearing (13), wherein the support ring (11) is annular, the wheel piece (12) is connected to the inner ring of the support ring (11), and the center of the wheel piece (12) is connected to the outer ring of the bearing (13), characterized in that, The self-braking caster also includes a self-braking mechanism, which includes: a first ratchet (21) and a second ratchet (31), which are axially spaced on the outer ring of the bearing (13), with the first tooth (211) of the first ratchet (21) and the second tooth (311) of the second ratchet (31) facing opposite directions; a first adapter (22) and a second adapter (32), both connected to the inner ring of the support ring (11); and a first stop tooth (23), located radially outside the first ratchet (21). The first end (231) of the tooth (23) is rotatably connected to the first adapter (22), and the second end (232) can be inserted into the tooth groove of the first stop tooth (23) to restrict the rotation of the first ratchet (21). The first end (231) and the second end (232) are opposite to each other. The second stop tooth (33) is located radially outside the second ratchet (31). The third end (331) of the second stop tooth (33) is rotatably connected to the second adapter (32), and the fourth end (332) can be inserted into the tooth groove of the second stop tooth (33). In the tooth groove, to restrict the rotation of the second ratchet (31), the third end (331) is opposite to the fourth end (332); the first elastic member (24), one end of which is rotatably connected to the inner ring of the support ring (11), and the other end of which is rotatably connected to the first stop tooth (23), when the rotation speed of the first ratchet (21) is less than the preset speed, the first elastic member (24) can make the second end (232) located outside the tooth groove of the first ratchet (21), and when the rotation speed of the first ratchet (21) is greater than the preset speed, the second end (232) Inserted into the tooth groove of the first ratchet (21); a second elastic member (34), one end of which is rotatably connected to the inner ring of the support ring (11), and the other end of which is rotatably connected to the second stop tooth (33). When the rotation speed of the second ratchet (31) is less than the preset speed, the second elastic member (34) can make the fourth end (332) located outside the tooth groove of the second ratchet (31). When the rotation speed of the second ratchet (31) is greater than the preset speed, the fourth end (332) is inserted into the tooth groove of the second ratchet (31).

2. The self-braking caster according to claim 1, characterized in that, The shape of the second end (232) is the same as the shape of the tooth groove of the first ratchet (21); and / or the shape of the fourth end (332) is the same as the shape of the tooth groove of the second ratchet (31).

3. The self-braking caster according to claim 1, characterized in that, The second end (232) includes a first insertion part (2321) and a first slot (2322), wherein the first insertion part (2321) is capable of being inserted into the tooth groove of the first ratchet (21), and the first tooth (211) is capable of being inserted into the first slot (2322); and / or the fourth end (332) includes a second insertion part (3321) and a second slot (3322), wherein the second insertion part (3321) is capable of being inserted into the tooth groove of the second ratchet (31), and the second tooth (311) is capable of being inserted into the second slot (3322).

4. The self-braking caster according to claim 3, characterized in that, The shape of the first insertion part (2321) is the same as the shape of the tooth groove of the first ratchet (21); and / or the shape of the second insertion part (3321) is the same as the shape of the tooth groove of the second ratchet (31).

5. The self-braking caster according to claim 1, characterized in that, The first elastic element (24) is a tension spring or a V-shaped spring sheet.

6. The self-braking caster according to claim 1, characterized in that, The first ratchet (21), the wheel (12) and the second ratchet (31) are arranged sequentially along the axial direction of the bearing (13).

7. The self-braking caster according to claim 6, characterized in that, The self-braking caster also includes a first cover plate (4) and a second cover plate (5), the first cover plate (4) covering the outside of the first ratchet (21), and the second cover plate (5) covering the outside of the second ratchet (31).

8. The self-braking caster according to claim 7, characterized in that, Both the first cover plate (4) and the second cover plate (5) are provided with shaft holes, and / or both the first cover plate (4) and the second cover plate (5) are engaged with the support ring (11).

9. The self-braking caster according to claim 1, characterized in that, Both the first adapter (22) and the second adapter (32) include an adapter plate (221), a first ear plate (222), a second ear plate (223), and a connecting shaft (224). The adapter plate (221) is connected to the inner ring of the support ring (11). The first ear plate (222) and the second ear plate (223) are axially spaced on the adapter plate (221) along the bearing (13). The connecting shaft (224) is connected to the first ear plate (222) and the second ear plate (223). The stop tooth is rotatably connected to the connecting shaft (224) and located between the first ear plate (222) and the second ear plate (223). And / or at least two first stop teeth (23) are provided circumferentially along the wheel body (1), and at least two second stop teeth (33) are provided circumferentially along the wheel body (1).

10. A transport vehicle, characterized in that, It includes a vehicle body and a self-braking caster as described in any one of claims 1-9, wherein the self-braking caster is connected to the bottom of the vehicle body.

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