A transfer car locking and self-locking device
Patent Information
- Application Number
- CN202522570555.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-10-20
- Estimated Expiration
- 2035-12-03
AI Technical Summary
[0002]现有的输送线中，在进入连续不停的循环生产线前，前后小车无法实现自动连接上锁，小车后轮方向也无法自动脱开并实现360°的转动；在退出连续不停的循环生产线后，前后小车无法快速实现自动脱锁并脱开，小车后轮无法实现及时锁定，人工推行时存在较大困难，使用时极其不灵活，人力成本较高，且生产效率较低
[0013]本实用新型具有如下优点：通过本实用新型的一种转运车锁车及自锁装置，在进入全自动生产线的同时，前后小车可实现自动连接上锁，后车轮解锁， 4个轮子都能360°转动，方便在全自动生产线上小车可顺着既定轨道的灵活调整路线；在离开全自动生产线的同时，前后小车可实现自动脱锁并脱开，后车轮上锁，前轮维持360度旋转，可由人工推行向各方向自由移动，方便后续流程中的灵活使用；上述全过程无需人工参与，降低了工人工作强度，提高了生产效率，并降低了人力成本。
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Figure CN224869209U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of conveyor technology, specifically to a transfer vehicle locking and self-locking device. Background Technology
[0002] In existing conveyor lines, before entering the continuous loop production line, the front and rear trolleys cannot automatically connect and lock, and the rear wheels of the trolleys cannot automatically disengage and rotate 360°. After exiting the continuous loop production line, the front and rear trolleys cannot quickly and automatically disengage, and the rear wheels of the trolleys cannot be locked in time. This makes manual pushing difficult, extremely inflexible in use, results in high labor costs, and low production efficiency. Utility Model Content
[0003] Therefore, this utility model provides a vehicle locking and self-locking device for a transfer cart to solve the above-mentioned problems in the prior art. It provides a device for automatically connecting or disconnecting the front and rear carts and automatically locking or unlocking the wheels on an automated production line, meeting the flexible use of carts with different requirements at the front and rear of the automated production line, reducing labor costs, and improving production efficiency. To achieve the above objectives, the present invention provides the following technical solution: According to a first aspect of the present invention, a transfer vehicle locking and self-locking device is provided. The device includes a front trolley and a rear trolley arranged sequentially. A locking wheel track is provided on the ground between the two universal wheels A at the front end of the front trolley and the rear trolley. A disengagement track is provided on the ground between the two universal wheels B at the rear end of the front trolley. A self-locking device is provided at the lower front end of both the front trolley and the lower front end of the rear trolley. The self-locking device cooperates with the locking wheel track to lock and unlock the universal wheels A. A locking device connecting the rear end of the front trolley and the front end of the rear trolley is provided at the connection point. The locking device cooperates with the disengagement track to connect and separate the front trolley and the rear trolley. When the self-locking device unlocks the universal wheels A, the locking device connects the front trolley and the rear trolley. When the self-locking device locks the universal wheels A, the locking device separates the front trolley and the rear trolley.
[0004] Furthermore, the locking device includes a connecting seat A installed at the bottom of the rear end of the front trolley and a connecting seat B installed at the bottom of the front end of the rear trolley. The bottom of the connecting seat A is provided with a laterally extending locking post, and the bottom of the connecting seat B is connected to a rotatable locking hook via a spring A. The rear end of the locking hook is rotatably connected to a roller A. When the roller A disengages from the unloading track, the spring A is in its initial state to restrict the front groove of the locking hook from engaging with the locking post. When the roller A contacts the unloading track, the spring A is in a stretched state to release the engagement between the front groove of the locking hook and the locking post.
[0005] Furthermore, the connecting seat A includes a connecting plate A and two connecting ears A that are vertically fixed to the lower surface of the connecting plate A, with a retaining post extending transversely between the two connecting ears A.
[0006] Furthermore, the connecting seat B includes a connecting plate B and two connecting ears B vertically fixed to the lower surface of the connecting plate B. A pin is transversely arranged between the two connecting ears B. The middle part of the hook is rotatably connected to the pin. One end of the spring A is engaged with the end of the pin, and the other end of the spring A is engaged with the back side of the groove at the front end of the hook.
[0007] Furthermore, spring A is a torsion spring.
[0008] Furthermore, the self-locking device includes two parallel slide rails fixed to the bottom of the front or rear trolley. A slider is slidably connected to each slide rail, and a sliding bracket connects the two sliders. The sliding bracket has a push rod extending along the trolley's forward direction. A locking plate is fixedly connected to the bottom of each slider, and a locking groove is provided at the front end of the locking plate. The bogie of the universal wheel A is provided with a buckle that engages with the locking groove. A downwardly extending swing link is hinged to the middle of the sliding bracket. A roller B is rotatably connected to the lower end of the swing link. The upper end of spring B is hooked to the middle of the sliding bracket, and the lower end of spring B is hooked to the middle of the swing link. When roller B gradually contacts the surface of the locking wheel track, under the holding force of spring B, the locking groove of the locking plate moves towards the buckle and locks it, thus restricting the free rotation of the universal wheel A. When the front and rear trolleys collide, the push rod is pushed back by the impact force, causing the locking groove of the locking plate to disengage from the buckle, thereby releasing the restriction on the free rotation of the universal wheel A.
[0009] Furthermore, spring B is a tension spring.
[0010] Furthermore, one end of the unloading track contact roller A is provided with an inclined surface.
[0011] Furthermore, the end of the locking wheel track that contacts roller B is provided with an inclined surface.
[0012] Furthermore, there are multiple front trolleys and multiple rear trolleys, which are connected in an alternating manner.
[0013] This invention has the following advantages: With the transfer cart locking and self-locking device of this invention, upon entering the fully automated production line, the front and rear trolleys can automatically connect and lock, the rear wheels unlock, and all four wheels can rotate 360°, facilitating flexible route adjustment along a predetermined track on the fully automated production line. Upon leaving the fully automated production line, the front and rear trolleys can automatically delock and disengage, the rear wheels lock, and the front wheels maintain 360-degree rotation, allowing for manual pushing and free movement in all directions, facilitating flexible use in subsequent processes. The entire process requires no manual intervention, reducing worker workload, improving production efficiency, and lowering labor costs. Attached Figure Description
[0014] Figure 1This is a schematic diagram of a trolley connection for a transfer vehicle locking and self-locking device, provided for some embodiments of this utility model.
[0015] Figure 2 This is a schematic diagram of the bottom of a trolley for connecting a transfer vehicle lock and self-locking device, provided for some embodiments of this utility model.
[0016] Figure 3 This is an enlarged schematic diagram of the structure at point C of a transfer vehicle locking and self-locking device provided for some embodiments of this utility model.
[0017] Figure 4 This is a schematic diagram of the combined state of a vehicle locking device and a self-locking device for a transport vehicle, provided for some embodiments of this utility model.
[0018] Figure 5 This is an exploded view of a vehicle locking device and a self-locking device for a transport vehicle, provided for some embodiments of this utility model.
[0019] Figure 6 This is a schematic diagram of a vehicle detachment track for a vehicle locking and self-locking device provided for some embodiments of the present invention.
[0020] Figure 7 This is an enlarged schematic diagram of the structure at point D of a transfer vehicle locking and self-locking device provided for some embodiments of this utility model.
[0021] Figure 8 This is a schematic diagram of a self-locking device for a transfer vehicle locking and self-locking device provided for some embodiments of this utility model.
[0022] Figure 9 This is a schematic diagram of a wheel-unlocking track for a transfer vehicle locking and self-locking device provided for some embodiments of the present invention.
[0023] In the diagram, A is the front trolley, B is the rear trolley, 1 is the locking device, 11 is the connecting plate A, 12 is the hook, 13 is the roller A, 14 is the spring A, 15 is the connecting ear A, 16 is the locking post, 17 is the connecting plate B, 18 is the connecting ear B, 19 is the pin, 2 is the unloading track, 3 is the self-locking device, 31 is the swing linkage, 32 is the spring B, 33 is the snap plate, 34 is the buckle, 35 is the push rod, 36 is the slide rail, 37 is the slider, 38 is the sliding bracket, 39 is the roller B, and 4 is the locking wheel track. Detailed Implementation
[0024] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0025] Example 1
[0026] like Figures 1 to 9 As shown in the first aspect embodiment of this utility model, a transfer vehicle locking and self-locking device includes a front trolley A and a rear trolley B arranged sequentially. Locking tracks 4 are provided on the ground between the two omnidirectional wheels A at the front ends of both the front trolley A and the rear trolley B. A disengagement track 2 is provided on the ground between the two omnidirectional wheels B at the rear end of the front trolley A. Self-locking devices 3 are provided at the lower front ends of both the front trolley A and the rear trolley B. The self-locking devices 3 cooperate with the locking tracks 4 to lock and unlock the omnidirectional wheels A. A locking device 1 is provided at the connection between the rear end of the front trolley A and the front end of the rear trolley B. The locking device 1 cooperates with the disengagement track 2 to connect and separate the front trolley A and the rear trolley B. When the self-locking device 3 unlocks the omnidirectional wheels A, the locking device 1 connects the front trolley A and the rear trolley B. When the self-locking device 3 locks the omnidirectional wheels A, the locking device 1 separates the front trolley A and the rear trolley B.
[0027] The technical effects achieved by the above embodiments are as follows: Through the transfer car locking and self-locking device of this embodiment, when entering the fully automated production line, the front and rear trolleys can automatically connect and lock, the rear wheels are unlocked, and all four wheels can rotate 360°, which facilitates the flexible adjustment of the trolley along the predetermined track on the fully automated production line; when leaving the fully automated production line, the front and rear trolleys can automatically delock and disengage, the rear wheels are locked, and the front wheels maintain 360-degree rotation, which can be manually pushed to move freely in all directions, facilitating flexible use in subsequent processes; the above process does not require manual intervention, reducing the labor intensity of workers, improving production efficiency, and reducing labor costs.
[0028] Example 2
[0029] like Figures 1 to 9As shown, a transfer vehicle locking and self-locking device includes all the contents of Embodiment 1. In addition, the locking device 1 includes a connecting seat A installed at the bottom of the rear end of the front trolley A and a connecting seat B installed at the bottom of the front end of the rear trolley B. The bottom of the connecting seat A is provided with a laterally extending locking post 16. The bottom of the connecting seat B is connected to a rotatable hook 12 through a spring A14. The rear end of the hook 12 is rotatably connected to a roller A13. When the roller A13 disengages from the unloading track 2, the spring A14 is in the initial state to restrict the front groove of the hook 12 from engaging with the locking post 16. When the roller A13 contacts the unloading track 2, the spring A14 is in the stretched state to release the engagement between the front groove of the hook 12 and the locking post 16. The roller A13 is rolled by hinged rolling or by setting a bearing in the roller A13.
[0030] Optionally, the connector A includes a connector plate A11 and two connector ears A15 that are vertically fixed to the lower surface of the connector plate A11, with a locking post 16 extending transversely between the two connector ears A15.
[0031] Optionally, the connector B includes a connecting plate B17 and two connecting ears B18 that are vertically fixed to the lower surface of the connecting plate B17. A pin 19 is transversely arranged between the two connecting ears B18. The middle part of the hook 12 is rotatably connected to the pin 19. One end of the spring A14 is engaged with the end of the pin 19, and the other end of the spring A14 is engaged with the back side of the front groove of the hook 12.
[0032] Optionally, spring A14 is a torsion spring.
[0033] The technical effects achieved by the above embodiments are as follows: by setting the specific structure of the locking device 1, the locking and disengaging between the hook 12 and the pin 16 effectively realizes the rapid connection and separation of the front trolley A and the rear trolley B; by setting the specific structure of the connecting seat A, the pin 16 is quickly installed; by setting the specific structure of the connecting seat B, the hook 12 and the pin 16 are effectively matched; by setting the roller A13, the sliding friction is effectively converted into rolling friction, reducing the wear of the roller A13 during operation and improving the efficiency of automatic connection and separation of the front trolley A and the rear trolley B.
[0034] Example 3
[0035] like Figures 1 to 9As shown, a transfer vehicle locking and self-locking device includes all the contents of Embodiment 2. In addition, the self-locking device 3 includes two parallel slide rails 36 fixed to the bottom of the front trolley A or the rear trolley B. A slider 37 is slidably connected to each slide rail 36. A sliding bracket 38 connects the two sliders 37. The sliding bracket 38 is provided with a push rod 35 extending along the forward direction of the trolley. A snap-fit plate 33 is fixedly connected to the bottom of each slider 37. A snap-fit groove is opened at the front end of the snap-fit plate 33. The bogie of the universal wheel A is provided with a buckle 34 that engages with the snap-fit groove. A downwardly extending swing link 31 is hinged to the middle of the sliding bracket 38. The lower end of the swing link 31 is rotatably connected to a roller B39. The upper end of the spring B32 is hooked to the middle of the sliding bracket 38, and the lower end of the spring B32 is hooked to the middle of the swing link 31. When the roller B39 gradually contacts the surface of the locking wheel track 4, under the holding force of the spring B32, the slot of the locking plate 33 moves toward the buckle 34 and locks it, thereby restricting the free rotation of the universal wheel A. When the front trolley A and the rear trolley B collide with each other, the push rod 35 is pushed back by the impact force to move the sliding bracket 38 so that the slot of the locking plate 33 disengages from the buckle 34, thereby releasing the restriction on the free rotation of the universal wheel A.
[0036] Optionally, spring B32 is a tension spring.
[0037] The technical effects achieved by the above embodiments are as follows: through the specific structural setting of the self-locking device 3, the action switching of quickly locking and unlocking the universal wheel A at the bottom of the front trolley A or the rear trolley B is effectively realized, which improves work efficiency; the setting of the slide rail 36 increases the reciprocating speed of the slider 37, plays a good limiting role, and makes the universal wheel A more stable when locked.
[0038] Example 4
[0039] like Figures 1 to 9 As shown, a transfer vehicle locking and self-locking device includes all the contents of Embodiment 3. In addition, one end of the unloading track 2 that contacts the roller A13 is provided with an inclined surface, and the inclination angle of the inclined surface is an acute angle.
[0040] Optionally, one end of the locking wheel track 4 that contacts the roller B39 is provided with an inclined surface, and the inclined angle of the inclined surface is an acute angle.
[0041] The technical effects achieved by the above embodiments are as follows: by providing an inclined surface at the end of the unloading track 2 that begins to contact the roller A13, the stability of the roller A13 in contact with the unloading track 2 is improved; by providing an inclined surface at the end of the locking wheel track 4 that begins to contact the roller B39, the stability of the roller B39 in contact with the locking wheel track 4 is improved.
[0042] Example 5
[0043] like Figures 1 to 9 As shown, a transfer vehicle locking and self-locking device includes all the contents of Embodiment 4, except that there are multiple front trolleys A and multiple rear trolleys B, and the multiple front trolleys A and multiple rear trolleys B are connected in an alternating manner.
[0044] The technical effect achieved by the above embodiments is that, under specific circumstances / positions, the front and rear trolleys can be locked or unlocked, not limited to two trolleys, and n (n≥2) trolleys can be locked or unlocked continuously.
[0045] The working process of the above embodiments is as follows: Figures 1 to 2 As shown, the front trolley A and the rear trolley B are connected and disconnected through the locking device 1. The rear wheels of the front trolley A and the rear trolley B (located at positions C and D in the figure) are the omnidirectional wheels A, which are locked and unlocked through the self-locking device 3 to control the direction of movement.
[0046] like Figures 3 to 6 As shown, the locking pin 16 is located on the front trolley A. When the roller A13 contacts the unloading track 2, the hook 12 moves along the inclined surface of the unloading track 2, gradually causing the hook 12 to slowly open and disengage from the locking pin 16 under the holding force of the spring A14. This releases the connection between the front trolley A and the rear trolley B, allowing both trolleys to move freely. This is suitable for situations where each trolley needs to move freely, such as when trolleys move along fixed tracks on an automated production line, unrestricted by the orientation of the front trolley A and the rear trolley B. When the rear trolley B collides with the front trolley A, the inclined surface of the hook 12 contacts the locking pin 16, locking the pin 16. At this point, the front trolley A and the rear trolley B automatically connect. Simultaneously, the push rod 35 is pushed back, as described in the next paragraph.
[0047] like Figures 7 to 9 As shown, the locking wheel track 4 is placed in a fixed position, which can be a designated location on the ground. A self-locking device 3 is installed near the rear wheels of each trolley. In the self-locking device 3, when the roller B39 at the lower end of the swing linkage 31 contacts the surface of the locking wheel track 4, under the holding force of the spring B32, the slot of the locking plate 33 slowly moves and engages the latch 34. At this time, the roller B39 continues to move slowly along the inclined surface of the locking wheel track 4, pushing the push rod 35 to move towards the rear trolley B, increasing the distance between the front and rear trolleys. This, combined with the front and rear trolley locking device 1, creates a certain distance when the front and rear trolleys are completely disengaged. Thus, when the latch 12 of the locking device 1 resets, the front and rear trolleys remain disengaged. When the rear trolley B impacts the front trolley A, the impact push rod 35 on the rear trolley B pushes back, and under the tension of the spring B32, the slot of the locking plate 33 disengages from the latch 34, allowing the caster wheel A to return to its 360° free movement state.
[0048] The locking device 1 needs to be used in conjunction with the unloading track 2 to achieve automatic locking. After the hook 12 and locking pin 16 of the locking device 1 are disengaged, the rear push rod 35 needs to extend. The push rod 35 will separate the rear trolley B from the front trolley A, so that the two trolleys are in a free state without restraint. Under specific circumstances / positions, the rear wheel of the trolley, i.e., the omnidirectional wheel A, will automatically lock the pin through the self-locking device 3, and the front wheel, i.e., the omnidirectional wheel B, will remain in a 360° free movement state, which is convenient for manual pushing of the trolley; or the rear wheel, i.e., the omnidirectional wheel A, will disengage, and all four wheels will be in a 360° free movement state, which is convenient for the trolley to move freely or move along a predetermined track direction. The self-locking device 3 needs to be used in conjunction with the locking wheel track 4 to achieve automatic locking. The rear wheel needs to be unlocked by the rear trolley B or by an external force hitting the push rod 35. In the automated production line, this external force can come from the automatic impact of the rear trolley B.
[0049] In the description of this utility model, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model.
[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.
[0054] In the description of this specification, the references to terms such as "Embodiment 1," "Embodiment 2," "Example," "Specific Example," or "Some Examples," etc., indicate that the specific method, apparatus, or feature described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, methods, apparatus, or features described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0055] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A vehicle locking and self-locking device for a transfer vehicle, characterized in that, The device includes a front trolley (A) and a rear trolley (B) arranged in sequence. Locking rails (4) are provided on the ground between the two omnidirectional wheels A at the front end of the front trolley (A) and the two omnidirectional wheels B at the rear end of the front trolley (A) are provided on the ground. Self-locking devices (3) are provided at the lower front end of the front trolley (A) and the lower front end of the rear trolley (B). The self-locking devices (3) cooperate with the locking rails (4) to lock the steering of the omnidirectional wheels A. The front trolley (A) and the rear trolley (B) are connected by a locking device (1). The locking device (1) works with the unloading track (2) to connect and separate the front trolley (A) and the rear trolley (B). When the self-locking device (3) unlocks the universal wheel A, the locking device (1) connects the front trolley (A) and the rear trolley (B). When the self-locking device (3) locks the universal wheel A, the locking device (1) separates the front trolley (A) and the rear trolley (B).
2. The vehicle locking and self-locking device for the transfer vehicle according to claim 1, characterized in that, The locking device (1) includes a connecting seat A installed at the bottom of the rear end of the front trolley (A) and a connecting seat B installed at the bottom of the front end of the rear trolley (B). The bottom of the connecting seat A is provided with a horizontally extending locking post (16). The bottom of the connecting seat B is connected to a rotatable hook (12) via a spring A (14). The rear end of the hook (12) is rotatably connected to a roller A (13). When the roller A (13) disengages from the unloading track (2), the spring A (14) is in the initial state to restrict the front groove of the hook (12) from engaging with the locking post (16). When the roller A (13) contacts the unloading track (2), the spring A (14) is in the stretched state to release the engagement between the front groove of the hook (12) and the locking post (16).
3. The vehicle locking and self-locking device for the transfer vehicle according to claim 2, characterized in that, The connecting seat A includes a connecting plate A (11) and two connecting ears A (15) that are vertically fixed to the lower surface of the connecting plate A (11). A locking post (16) is provided transversely between the two connecting ears A (15).
4. The vehicle locking and self-locking device for the transfer vehicle according to claim 3, characterized in that, The connecting seat B includes a connecting plate B (17) and two connecting ears B (18) that are vertically fixed to the lower surface of the connecting plate B (17). A pin (19) is horizontally inserted between the two connecting ears B (18). The middle part of the hook (12) is rotatably connected to the pin (19). One end of the spring A (14) is engaged with the end of the pin (19), and the other end of the spring A (14) is engaged with the back side of the groove at the front end of the hook (12).
5. The vehicle locking and self-locking device for the transfer vehicle according to claim 4, characterized in that, Spring A (14) is a torsion spring.
6. The vehicle locking and self-locking device for the transfer vehicle according to claim 1, characterized in that, The self-locking device (3) includes two parallel slide rails (36) fixed to the bottom of the front trolley (A) or the rear trolley (B). A slider (37) is slidably connected to each slide rail (36). A sliding bracket (38) is connected between the two sliders (37). The sliding bracket (38) is provided with a push rod (35) extending along the forward direction of the trolley. A snap-fit plate (33) is fixedly connected to the bottom of each slider (37). A snap-fit groove is opened at the front end of the snap-fit plate (33). The bogie of the universal wheel A is provided with a buckle (34) that engages with the snap-fit groove. A downwardly extending swing link (31) is hinged to the middle of the sliding bracket (38). A roller is rotatably connected to the lower end of the swing link (31). The upper end of wheel B (39) and spring B (32) is attached to the middle of the sliding bracket (38), and the lower end of spring B (32) is attached to the middle of the swing link (31). When the roller B (39) gradually contacts the surface of the locking wheel track (4), under the holding force of spring B (32), the slot of the snap plate (33) moves toward the buckle (34) and locks it, thereby restricting the free rotation of the universal wheel A. When the front trolley (A) and the rear trolley (B) collide with each other, the push rod (35) is pushed back by the impact force to move the sliding bracket (38) so that the slot of the snap plate (33) disengages from the snap engagement with the buckle (34) and thus releases the restriction on the free rotation of the universal wheel A.
7. The vehicle locking and self-locking device for the transfer vehicle according to claim 6, characterized in that, Spring B (32) is a tension spring.
8. The vehicle locking and self-locking device for the transfer vehicle according to claim 2, characterized in that, The end of the track (2) that contacts the roller A (13) has an inclined surface.
9. The vehicle locking and self-locking device for the transfer vehicle according to claim 6, characterized in that, The end of the locking wheel track (4) that contacts the roller B (39) has an inclined surface.
10. The vehicle locking and self-locking device for the transfer vehicle according to claim 1, characterized in that, There are multiple front cars (A) and multiple rear cars (B), and the multiple front cars (A) and multiple rear cars (B) are connected in an alternating manner.