Self-locking mechanism and logistics vehicle

Abstract

The present invention belongs to the technical field of factory logistics, and discloses a self-locking mechanism and a logistics vehicle. The self-locking mechanism includes: a universal wheel assembly, which is arranged on a trailer; a locking rod, which is rotatably arranged on the trailer; a driving mechanism and a transmission assembly, one end of the transmission assembly is connected to the driving mechanism, and the other end is connected to the locking rod, and the driving mechanism can drive the locking rod to rotate relative to the trailer through the transmission assembly, so that the end of the locking rod away from the transmission assembly can lock and unlock the universal wheel assembly. The self-locking mechanism can realize the locking and unlocking of the universal wheel assembly by using the locking rod through the mutual cooperation of the driving mechanism and the transmission assembly. Compared with the prior art, it has a simple structure and is easy to use. It does not need to reprocess the universal wheel assembly, which reduces the difficulty of installation, thereby improving the assembly production efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of factory logistics, and in particular to a self-locking mechanism and a logistics vehicle. Background Art

[0002] In actual factory production, logistics vehicles are often used to transport goods. Logistics vehicles include tractors and trailers. The trailer is generally a flatbed truck structure, so the trailer can also be called a tractor. The tractor is connected to the trailer through a traction rod, so that the tractor and the trailer can achieve similar co-trajectory travel. In order to ensure the follow-up effect between the trailer and the tractor, the front two wheels are universal wheels and the rear two wheels are fixed wheels among the four wheels set at the bottom of the tractor. However, when the trailer is reversed with the tractor, since the universal wheels can rotate freely, it is not easy to accurately control the trajectory of the trailer during the reversing process, and the trailer is prone to large deviations, resulting in reverse docking failure.

[0003] In order to solve this problem, the prior art uses a locking mechanism to lock the universal wheel. Specifically, the locking mechanism includes a driving motor and a positioning pin. A groove is provided on the universal wheel. The driving motor is connected to the positioning pin through a transmission structure to drive the positioning pin to selectively insert into the groove, so that the universal wheel can switch between the universal mode and the directional mode. This method requires the universal wheel to be reprocessed to open a groove, which undoubtedly increases the difficulty of installation and affects the production efficiency of assembly. Summary of the invention

[0004] The object of the present invention is to provide a self-locking mechanism for locking and unlocking a universal wheel, which has a simple structure and low production cost.

[0005] Another object of the present invention is to provide a logistics vehicle that can accurately control the reversing trajectory without affecting normal driving.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A self-locking mechanism, comprising:

[0008] A universal wheel assembly is arranged on the trailer;

[0009] A locking rod, the locking rod being rotatably disposed on the trailer;

[0010] A driving mechanism and a transmission assembly, one end of the transmission assembly is connected to the driving mechanism, and the other end is connected to the locking rod. The driving mechanism can drive the locking rod to rotate relative to the trailer through the transmission assembly, so that the end of the locking rod away from the transmission assembly can lock and unlock the universal wheel assembly.

[0011] Preferably, the transmission assembly comprises a traction link assembly, one end of which is connected to the driving mechanism, and the other end of which is connected to the locking rod.

[0012] Preferably, the transmission assembly comprises a traction rope, one end of which can be connected to the driving mechanism, and the other end of which is connected to the locking rod;

[0013] The self-locking mechanism also includes an elastic member, one end of which is connected to the trailer, and the other end of which is connected to the locking rod. The elastic member is used for the locking rod to lock the universal wheel assembly.

[0014] Preferably, it further comprises a fixing member, wherein the fixing member is arranged on the trailer, and one end of the elastic member is connected to the trailer via the fixing member.

[0015] Preferably, the driving mechanism comprises a driving source, an output end of which is connected to the transmission assembly, wherein the driving source is a motor, a cylinder or an electric cylinder; or

[0016] The driving mechanism comprises a traction column, which is arranged on the tractor and connected to the transmission assembly.

[0017] Preferably, the driving mechanism includes a traction column, a traction rod is provided on the side of the trailer close to the tractor, a slide groove is provided on the traction rod, the traction column is inserted into the slide groove and can slide in the slide groove, so that the end of the locking rod away from the transmission assembly can lock the universal wheel assembly.

[0018] Preferably, the driving mechanism further comprises a traction ring, which is sleeved on the traction rod and connected to the transmission assembly, and the traction column is passed through the traction ring and can abut against the inner wall of the traction ring.

[0019] Preferably, the universal wheel assembly comprises:

[0020] A mounting seat, rotatably disposed on the trailer;

[0021] A universal wheel, rotatably disposed on the mounting seat, and the locking rod can abut against the mounting seat;

[0022] Preferably, the mounting seat comprises:

[0023] A body, rotatably disposed on the trailer;

[0024] A limit block is arranged on the outer wall of the body, and a limit groove is arranged on the locking rod, wherein the inner wall of the limit groove can abut against the outer wall of the limit block;

[0025] Preferably, the cross sections of the limiting groove and the limiting block are both arc-shaped structures.

[0026] Preferably, it further comprises a rotating shaft, which is arranged on the trailer and passes through the locking rod, and the locking rod can rotate relative to the rotating shaft.

[0027] Preferably, a limiting member is further included, wherein the limiting member is arranged on the trailer, and the limiting member is configured to limit the locking rod when the locking rod locks the universal wheel assembly.

[0028] Preferably, the self-locking mechanism includes two universal wheel assemblies, and each universal wheel assembly is provided with a locking rod. The driving mechanism can simultaneously drive the two locking rods to rotate relative to the trailer bucket through the transmission assembly, so as to lock and unlock the two universal wheel assemblies.

[0029] To achieve the above-mentioned purpose, the present invention also provides a logistics vehicle, including a tractor, a trailer and the above-mentioned self-locking mechanism, wherein the self-locking mechanism is arranged between the tractor and the trailer, and the tractor is connected to the trailer and can drive the trailer to travel or turn.

[0030] Beneficial effects of the present invention:

[0031] The self-locking mechanism provided by the present invention has the following advantages: when the universal wheel assembly needs to be locked, the driving mechanism can drive the locking rod to rotate relative to the trailer bucket through the transmission assembly, and the transmission assembly plays a role of power transmission, so that the end of the locking rod away from the transmission assembly locks the universal wheel assembly, thereby realizing the position locking process of the universal wheel assembly; when the universal wheel assembly needs to be unlocked, the driving mechanism drives the locking rod to rotate in the opposite direction relative to the trailer bucket through the transmission assembly, so that the end of the locking rod away from the transmission assembly unlocks the universal wheel assembly, thereby realizing the unlocking process of the universal wheel assembly.

[0032] Through the cooperation of the driving mechanism and the transmission assembly, the locking and unlocking of the universal wheel assembly can be achieved using the locking rod. Compared with the existing technology, it has a simple structure and is easy to use. It does not require further processing of the universal wheel assembly, reduces the difficulty of installation, and thus improves assembly production efficiency.

[0033] The logistics vehicle provided by the present invention has a self-locking mechanism between the tractor and the trailer. During normal driving, the universal wheel assembly is in an unlocked state, the universal wheel assembly is in a universal mode and can rotate freely, has good flexibility, and does not affect the normal driving process; during reversing, the universal wheel assembly is in a locked state, the universal wheel assembly is in a directional mode, the position of the universal wheel assembly is locked, and the universal wheel assembly can be locked to a preset turning angle position. When reversing, the vehicle only reverses according to a fixed turning angle or turning radius, so that the tractor can drive the trailer to reverse along a fixed reversing trajectory, avoids a large position offset, thereby accurately controlling the reversing trajectory and achieving a good reversing docking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic structural diagram of a tractor provided by the first embodiment of the present invention from one perspective;

[0035] Figure 2 is a schematic structural diagram of the tractor provided by the first embodiment of the present invention from another perspective;

[0036] Figure 3 It is a structural schematic diagram of a self-locking mechanism in a tractor provided in Embodiment 1 of the present invention.

[0037] In the figure:

[0038] 100, tractor; 200, trailer; 201, drawbar; 202, chute;

[0039] 1. Universal wheel assembly; 2. Locking rod; 3. Driving mechanism; 4. Transmission assembly; 5. Elastic member; 6. Fixing member; 7. Rotating shaft; 8. Limiting member;

[0040] 11. mounting seat; 111. body; 112. limit block; 12. universal wheel;

[0041] 21. Limiting groove;

[0042] 31. Traction post; 32. Traction ring. DETAILED DESCRIPTION

[0043] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0047] Embodiment 1

[0048] This embodiment provides a logistics vehicle, such as Figure 1 As shown, the logistics vehicle includes a tractor 100 and a trailer 200. The tractor 100 can also be called a tractor head, and the trailer 200 can also be called a tractor flatbed. The tractor 100 is the main driving structure, and the trailer 200 is the driven structure. The tractor 100 is connected to the trailer 200, and the trailer 200 is used to carry goods. The tractor 100 can drive the trailer 200 to move, thereby realizing the transportation process of the goods.

[0049] In order to ensure the accuracy of the traction of the tractor 100 to the trailer 200, Figure 2As shown, a plurality of wheels are rotatably arranged at the bottom of the trailer 200, so that the trailer 200 can move in a similar trajectory to that of the tractor 100. Among the plurality of wheels, the universal wheel assembly 1 is located in the front, and the universal wheel assembly 1 specifically includes two universal wheels 12 arranged at intervals, and the fixed wheel assembly is located in the rear, and the fixed wheel assembly specifically includes two fixed wheels arranged at intervals. It can be understood that the universal wheel 12 is the so-called movable caster, and its structure allows 360° horizontal rotation. The fixed wheel has no rotating structure and cannot rotate horizontally but only vertically. By using the universal wheel 12 and the fixed wheel in combination, the tractor 100 can drive the trailer 200 to travel or turn freely and flexibly, so that the tractor 100 and the trailer 200 can move along approximately the same trajectory.

[0050] Due to the rotation flexibility of the universal wheel assembly 1, the trailer 200 can match the track of the tractor 100 as much as possible during the forward movement. However, when the trailer 200 is reversed with the tractor 100, since the universal wheel 12 can rotate freely, it is not easy to accurately control the track of the trailer 200 during the reverse process, and the trailer 200 is prone to large deviation, resulting in reverse docking failure. In order to solve this problem, a self-locking mechanism is provided between the tractor 100 and the trailer 200 for locking and unlocking the universal wheel assembly 1.

[0051] The logistics vehicle provided by the present embodiment is provided with a self-locking mechanism between the tractor 100 and the trailer 200. During normal driving, the universal wheel assembly 1 is in an unlocked state, the universal wheel assembly 1 is in a universal mode and can rotate freely, with good flexibility and no influence on the normal driving process; during reversing, the universal wheel assembly 1 is in a locked state, the universal wheel assembly 1 is in a directional mode, the position of the universal wheel assembly 1 is locked, and the universal wheel assembly 1 can be locked to a preset turning angle position. When reversing, the tractor 100 only reverses according to a fixed turning angle or turning radius, so that the tractor 100 can drive the trailer 200 to reverse along a fixed reversing trajectory, avoiding a large position deviation, thereby accurately controlling the reversing trajectory and achieving a good reversing docking effect.

[0052] The existing self-locking mechanism includes a drive motor and a positioning pin. A positioning slot is set on the universal wheel. The drive motor drives the positioning pin to selectively insert into the positioning slot, so that the universal wheel switches between the universal mode and the directional mode. However, the positioning slot needs to be processed on each universal wheel. This reprocessing method will not only damage the appearance of the universal wheel, but also increase the difficulty of installation and assembly. At the same time, the locking and unlocking of the universal wheel requires an additional drive motor to be realized, which has a complex structure, too many parts, and high production costs.

[0053] In order to solve this problem, this embodiment provides a self-locking mechanism, such as Figure 3As shown, the self-locking mechanism includes a universal wheel assembly 1, a locking rod 2, a driving mechanism 3 and a transmission assembly 4. The universal wheel assembly 1 is arranged on the trailer 200, and the locking rod 2 is rotatably arranged on the trailer 200. One end of the transmission assembly 4 is connected to the driving mechanism 3, and the other end is connected to the locking rod 2. The driving mechanism 3 can drive the locking rod 2 to rotate relative to the trailer 200 through the transmission assembly 4, so that the end of the locking rod 2 away from the transmission assembly 4 can lock and unlock the universal wheel assembly 1.

[0054] The self-locking mechanism provided in this embodiment has the following advantages: when the universal wheel assembly 1 needs to be locked, the driving mechanism 3 drives the locking rod 2 to rotate in the positive direction relative to the trailer 200 through the transmission assembly 4, and the positive rotation is to rotate in the direction close to the universal wheel assembly 1. The transmission assembly 4 plays a role in power transmission, so that the end of the locking rod 2 away from the transmission assembly 4 is locked to the universal wheel assembly 1, so as to realize the position locking process of the universal wheel assembly 1; when the universal wheel assembly 1 needs to be unlocked, the driving mechanism 3 drives the locking rod 2 to rotate in the reverse direction relative to the trailer 200 through the transmission assembly 4, and the reverse rotation is to rotate in the direction away from the universal wheel assembly 1, so that the end of the locking rod 2 away from the transmission assembly 4 is unlocked to the universal wheel assembly 1, so as to realize the unlocking process of the universal wheel assembly 1.

[0055] Through the cooperation between the driving mechanism 3 and the transmission assembly 4, the locking and unlocking of the universal wheel assembly 1 can be achieved by using the locking rod 2. Compared with the prior art, it has a simple structure and is easy to use. It does not require further processing of the universal wheel assembly 1, which reduces the difficulty of installation and thus improves assembly production efficiency.

[0056] The driving mechanism 3 and the transmission assembly 4 are introduced in detail below.

[0057] The driving mechanism 3 may include a driving source, the output end of which is connected to the transmission assembly 4, and the driving source drives the locking rod 2 to rotate relative to the trailer 200 through the transmission assembly 4, wherein the driving source is a motor, a cylinder or an electric cylinder. It can be understood that if the driving source is a cylinder or an electric cylinder, the output rod of the cylinder or the electric cylinder is directly connected to the transmission assembly 4 to transmit the linear output power of the cylinder or the electric cylinder to the transmission assembly 4; if the driving source is a motor, the output rod of the motor is connected to the transmission assembly 4 through a screw nut pair to convert the rotational motion of the motor into linear motion and transmit it to the transmission assembly 4.

[0058] Alternatively, if Figure 3 As shown, the driving mechanism 3 may further include a traction column 31, and the traction column 31 may also be directly driven by a driving member, which may be arranged on the tractor 100 or the trailer 200. The driving member may specifically be a motor, a cylinder or an electric cylinder, etc. The driving method of the traction column 31 by the driving member is similar to the driving method of the above-mentioned driving source for the transmission assembly 4, so it will not be described in detail.

[0059] It is understandable that the traction post 31 may not be directly driven by the driving member, and the traction post 31 may also be driven by the tractor 100, and the traction post 31 is arranged on the tractor 100. Specifically, a boss is arranged on the side of the tractor 100 close to the trailer 200, and the traction post 31 is vertically arranged on the boss. The traction post 31 is driven forward by the driving force of the tractor 100, and the traction post 31 drives the locking rod 2 to rotate relative to the trailer 200 through the transmission assembly 4, so as to unlock the universal wheel assembly 1; when reversing is required, the traction post 31 is driven backward by the driving force of the tractor 100, and the traction post 31 drives the locking rod 2 to rotate in the opposite direction relative to the trailer 200 through the transmission assembly 4, so as to lock the universal wheel assembly 1.

[0060] In this embodiment, the traction column 31 is preferably provided on the tractor 100. The driving source for the locking and unlocking process of the universal wheel assembly 1 only needs to utilize the traction column 31 with the help of the driving force of the tractor 100, and there is no need to additionally provide other driving parts such as motors. The structure is simple, the number of parts is reduced, and the production cost is reduced.

[0061] The tractor 100 and the trailer 200 can be connected by a connecting rod. Preferably, the tractor 100 and the trailer 200 can be connected by a traction column 31. Specifically, a traction bar 201 is provided on the side of the trailer 200 close to the tractor 100, and a slide groove 202 is provided on the traction bar 201. The traction column 31 is inserted into the slide groove 202. The traction column 31 is inserted into the slide groove 202, so that the tractor 100 and the trailer 200 can be connected as a whole through the traction column 31 and the traction bar 201. At this time, the traction column 31 and the traction bar 201 play the role of an intermediate connection. The tractor 100 drives the traction column 31, and drives the trailer 200 to move through the traction bar 201.

[0062] Since the traction column 31 is used as the driving structure of the transmission assembly 4, the traction column 31 needs to pull the transmission assembly 4. If the traction column 31 and the slide slot 202 are rigidly connected, the traction column 31 lacks movable space, and the traction column 31 cannot pull and pull the transmission assembly 4. To this end, the slide slot 202 can be a rectangular slot or a circular slot structure, etc. The length or diameter of the slide slot 202 is at least greater than the diameter of the traction column 31. The traction column 31 can slide in the slide slot 202, so that the end of the locking rod 2 away from the transmission assembly 4 can selectively abut against the outer side of the universal wheel assembly 1 to achieve the locking of the universal wheel assembly 1. The slide slot 202 not only guides the traction column 31, but also provides a certain sliding space for the traction column 31.

[0063] Furthermore, the transmission assembly 4 includes a traction rope, one end of which can be connected to the driving mechanism 3, and the other end of which is connected to the locking rod 2. Preferably, one end of the traction rope can be directly tied to the traction column 31, and when the traction column 31 moves forward with the tractor 100, the other end of the traction rope can pull the locking rod 2 to rotate the locking rod 2 relative to the trailer 200. The traction rope is used for power transmission between the traction column 31 and the locking rod 2, and has good power transmission effect, low installation cost and good reliability.

[0064] If the traction rope is directly connected to the traction column 31, the traction column 31 may wear the traction rope when sliding relative to the slide groove 202. Under long-term wear, the traction rope may even be worn off. In order to solve this problem, the driving mechanism 3 also includes a traction ring 32, which is a rectangular ring structure. The traction ring 32 is sleeved on the traction rod 201 and connected to the traction rope of the transmission component 4. The traction column 31 is inserted into the traction ring 32 and can abut against the inner wall of the traction ring 32. The traction ring 32 plays the role of connecting the traction column 31 and the traction rope. The traction ring 32 realizes the isolation of the traction column 31 and the traction rope.

[0065] The purposes of adopting this method are: first, to prevent the traction rope from being easily broken due to the friction between the traction column 31 and the slide groove 202, thereby protecting the traction rope and extending its service life; second, the traction column 31 is inserted into the traction ring 32 and can abut against the inner wall of the traction ring 32. The traction ring 32 can further guide and limit the traction column 31, and can also provide a certain amount of activity space for the traction column 31, thereby preventing the traction column 31 from getting stuck.

[0066] In order to further protect the traction rope, optionally, a protective cover is provided on the outside of the traction rope. Specifically, the protective cover is a sleeve structure, and the traction rope passes through the protective cover. By providing the protective cover, the durability of the traction rope is improved.

[0067] It can be understood that the traction rope is a flexible structure. When the tractor 100 moves forward, the traction rope straightens and can pull the locking rod 2 to rotate, so as to unlock the universal wheel assembly 1. However, the rigidity of the traction rope is relatively small. When the tractor 100 moves backward, the traction rope is in a relaxed state, and it is difficult to pull the locking rod 2 to rotate in the opposite direction, so as to lock the universal wheel assembly 1.

[0068] In order to solve this problem, the self-locking mechanism further includes an elastic member 5, which can be specifically a spring. One end of the elastic member 5 is connected to the trailer 200, and the other end is connected to one end of the locking rod 2 close to the universal wheel assembly 1. The elastic member 5 is used to lock the universal wheel assembly 1 with the locking rod 2. When the traction column 31 pulls the traction rope forward through the traction ring 32, the traction rope pulls the locking rod 2 to rotate. At this time, the elastic member 5 is in an extended state; when the tractor 100 moves backward, the traction rope is in a relaxed state, and the force of the traction rope on the locking rod 2 gradually decreases. Under its own restoring force, the elastic member 5 pulls the locking rod 2 to rotate in the direction close to the universal wheel assembly 1 until the locking rod 2 locks the universal wheel assembly 1.

[0069] Furthermore, the self-locking mechanism also includes a fixing member 6, which is specifically a fixing bolt. The fixing member 6 is arranged on the trailer 200, and one end of the elastic member 5 is connected to the trailer 200 through the fixing member 6. By setting the fixing member 6, the installation and fixation of the elastic member 5 are achieved, and the structure is simple and easy to use.

[0070] The locking rod 2 and the universal wheel assembly 1 are respectively described in detail below.

[0071] The locking rod 2 is a rod-shaped structure, which is essentially a rotating lever. In order to ensure the rotation effect of the locking rod 2, the self-locking mechanism also includes a rotating shaft 7, which is arranged on the trailer 200 and passes through the locking rod 2. The locking rod 2 can rotate relative to the rotating shaft 7, so that the locking rod 2 can rotate freely, so that the end of the locking rod 2 away from the traction rope can unlock or lock the universal wheel assembly 1.

[0072] Furthermore, the self-locking mechanism also includes a limit member 8, which can be a mounting screw. The limit member 8 is arranged on the trailer 200, and the limit member 8 and the elastic member 5 are arranged on the same side of the locking rod 2. The limit member 8 is configured to limit the locking rod 2 when the locking rod 2 locks the universal wheel assembly 1, so as to avoid rigid collision between the locking rod 2 and the universal wheel assembly 1 and extend the service life.

[0073] The universal wheel assembly 1 includes a mounting seat 11 and a universal wheel 12. The mounting seat 11 is rotatably arranged on the trailer 200, and the universal wheel 12 is rotatably arranged on the mounting seat 11. Specifically, the mounting seat 11 is rotatably arranged on the trailer 200 via a first rotating shaft, and the first rotating shaft is arranged vertically, so that the mounting seat 11 can rotate around the first rotating shaft. A second rotating shaft is arranged on the mounting seat 11, and the rotating shaft is arranged in a horizontal direction. The universal wheel 12 can rotate around the second rotating shaft. With this arrangement, the rotation freedom and flexibility of the universal wheel 12 are improved. The locking rod 2 can abut against the mounting seat 11, so that the universal wheel 12 has a preset locking angle relative to the first rotating shaft to avoid track deviation during reversing, and the universal wheel 12 can rotate relative to the second rotating shaft without affecting the movement of the trailer 200.

[0074] Specifically, the mounting seat 11 includes a body 111 and a limit block 112. The body 111 is rotatably arranged on the trailer 200 through a first rotating shaft. The limit block 112 is arranged on the outer wall of the body 111. The limit block 112 can also be called a locking tongue. A limit groove 21 is arranged on the locking rod 2. The inner wall of the limit groove 21 can abut against the outer wall of the limit block 112. The locking effect of the locking rod 2 on the universal wheel assembly 1 is further ensured by the mutual cooperation between the limit groove 21 and the limit block 112. At the same time, only one limit block 112 needs to be installed on the outer side of the existing universal wheel assembly 1, so the modification range is small and the use is convenient.

[0075] Preferably, the cross-sections of the limiting groove 21 and the limiting block 112 are both arc-shaped structures. Specifically, the inner wall diameter of the limiting groove 21 is greater than or equal to the outer wall diameter of the limiting block 112, and the interior of the limiting groove 21 is used to accommodate the limiting block 112. The purpose of adopting this structure is, first, the contour shapes of the limiting groove 21 and the limiting block 112 match each other, and the limiting effect is good, thereby ensuring the locking effect of the universal wheel assembly 1; second, the arc structure has a good transition effect, which facilitates the separation of the limiting groove 21 and the limiting block 112 from each other.

[0076] It is understandable that there are two universal wheel assemblies 1, and each universal wheel assembly 1 is provided with a locking rod 2. The driving mechanism 3 can simultaneously drive the two locking rods 2 to rotate relative to the trailer 200 through the transmission assembly 4, so as to lock and unlock the two universal wheel assemblies 1. In this way, the two universal wheel assemblies 1 can be locked simultaneously by using a traction column 31, a traction ring 32 and a traction rope, which saves production costs and is highly efficient. It should be particularly noted that the structure of the traction rope is not a linear type at this time, but a "Y" shape, one end of the traction rope is connected to the traction ring 32, and the two outlets of the traction rope are respectively connected to the two locking rods 2.

[0077] The working process of the self-locking mechanism provided in this embodiment is as follows:

[0078] When the universal wheel assembly 1 needs to be unlocked, the driving force of the tractor 100 is used to drive the traction column 31 to move forward, and the traction column 31 drives the traction ring 32 to move. The traction ring 32 straightens the traction rope, so that the traction rope drives the locking rod 2 to rotate relative to the trailer 200 in a direction away from the universal wheel assembly 1, and the limiting groove 21 of the locking rod 2 is separated from the limiting block 112 of the universal wheel assembly 1, so as to realize the unlocking process of the universal wheel assembly 1. During this process, the elastic member 5 is in a gradually extended state;

[0079] When the universal wheel assembly 1 needs to be locked, the driving force of the tractor 100 is used to drive the traction column 31 to move backward, the traction rope is gradually in a relaxed state, and the force of the traction rope on the locking rod 2 is gradually reduced. Under the restoring force of the stretched elastic member 5, the elastic member 5 pulls the locking rod 2 to rotate relative to the trailer 200 in a direction close to the universal wheel assembly 1, and the inner wall of the limiting groove 21 of the locking rod 2 abuts against the limiting block 112 of the universal wheel assembly 1 to realize the locking process of the universal wheel assembly 1.

[0080] Embodiment 2

[0081] The difference between this embodiment and the first embodiment is only the specific form of the transmission assembly 4. The transmission assembly 4 provided in this embodiment includes a traction link assembly, one end of which is connected to the driving mechanism 3, and the other end is connected to the locking rod 2.

[0082] Compared with the flexible structure of the traction rope, the traction link assembly has a relatively large rigidity. When the tractor 100 moves forward, the traction link assembly can pull the locking rod 2 to rotate, so as to unlock the universal wheel assembly 1; when the tractor 100 moves backward, due to its large rigidity, the traction link assembly can directly push the locking rod 2 to rotate in the opposite direction, so as to lock the universal wheel assembly 1.

[0083] With this structure, as the tractor 100 travels and moves backward, the locking and unlocking of the universal wheel assembly 1 can be achieved through the driving mechanism 3, thereby reducing the number of parts and lowering the production cost.

[0084] Further, the traction link assembly may specifically include a first traction link, a second traction link and a third traction link, one end of the first traction link is hinged to the traction ring 32, and the other end is hinged to the second traction link and the third traction link respectively, the second traction link and the third traction link are respectively hinged to the two locking rods 2, and the first traction link, the second traction link and the third traction link form a "Y" shaped structure. It can be understood that each hinge point is specifically a rotation joint.

[0085] It should be noted that, although the traction link assembly can achieve the locking of the universal wheel assembly 1, an elastic member 5 is preferably provided between the trailer 200 and the locking rod 2. The elastic member 5 not only assists the locking of the universal wheel assembly 1, but also facilitates the resetting of the locking rod 2.

[0086] In the description herein, it should be understood that the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0087] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0088] In addition, the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A self-locking mechanism, characterized in that: include: A universal wheel assembly (1) is arranged on the trailer (200); A locking rod (2), the locking rod (2) being rotatably disposed on the trailer (200); A driving mechanism (3) and a transmission assembly (4), wherein one end of the transmission assembly (4) is connected to the driving mechanism (3) and the other end is connected to the locking rod (2), and the driving mechanism (3) can drive the locking rod (2) to rotate relative to the trailer (200) through the transmission assembly (4), so that the end of the locking rod (2) away from the transmission assembly (4) can lock and unlock the universal wheel assembly (1); The universal wheel assembly (1) comprises: A mounting seat (11) rotatably mounted on the trailer (200); A universal wheel (12) rotatably disposed on the mounting seat (11), and the locking rod (2) can abut against the mounting seat (11); The mounting seat (11) comprises: A body (111) is rotatably disposed on the trailer (200); A limit block (112) is arranged on the outer wall of the body (111); a limit groove (21) is arranged on the locking rod (2); and an inner wall of the limit groove (21) can abut against the outer wall of the limit block (112); The cross sections of the limiting groove (21) and the limiting block (112) are both arc-shaped structures; The transmission assembly (4) comprises a traction link assembly, one end of which is connected to the driving mechanism (3) and the other end of which is connected to the locking rod (2).

2. The self-locking mechanism according to claim 1, characterized in that: The transmission assembly (4) comprises a traction rope, one end of which can be connected to the driving mechanism (3), and the other end of which is connected to the locking rod (2); The self-locking mechanism further comprises an elastic member (5), one end of the elastic member (5) being connected to the trailer (200) and the other end being connected to the locking rod (2), the elastic member (5) being used for the locking rod (2) to lock the universal wheel assembly (1).

3. The self-locking mechanism according to claim 2, characterized in that: It also includes a fixing member (6), wherein the fixing member (6) is arranged on the trailer (200), and one end of the elastic member (5) is connected to the trailer (200) via the fixing member (6).

4. The self-locking mechanism according to claim 1, characterized in that: The driving mechanism (3) comprises a driving source, the output end of which is connected to the transmission component (4), wherein the driving source is a motor, a cylinder or an electric cylinder; or The driving mechanism (3) comprises a traction column (31), wherein the traction column (31) is arranged on the tractor (100), and the traction column (31) is connected to the transmission assembly (4).

5. The self-locking mechanism according to claim 4, characterized in that: The driving mechanism (3) comprises a traction column (31), a traction rod (201) is arranged on a side of the trailer (200) close to the tractor (100), a slide groove (202) is arranged on the traction rod (201), and the traction column (31) is inserted into the slide groove (202) and can slide in the slide groove (202), so that the end of the locking rod (2) away from the transmission assembly (4) can lock the universal wheel assembly (1).

6. The self-locking mechanism according to claim 5, characterized in that: The driving mechanism (3) further comprises a traction ring (32), wherein the traction ring (32) is sleeved on the traction rod (201) and connected to the transmission assembly (4), and the traction column (31) is passed through the traction ring (32) and can abut against the inner wall of the traction ring (32).

7. The self-locking mechanism according to any one of claims 1 to 6, characterized in that: It also comprises a rotating shaft (7), wherein the rotating shaft (7) is arranged on the trailer (200) and passes through the locking rod (2), and the locking rod (2) is capable of rotating relative to the rotating shaft (7).

8. The self-locking mechanism according to any one of claims 1 to 6, characterized in that: It also comprises a limiting member (8), the limiting member (8) being arranged on the trailer (200), the limiting member (8) being configured to limit the locking rod (2) when the locking rod (2) locks the universal wheel assembly (1).

9. The self-locking mechanism according to any one of claims 1 to 6, characterized in that: The self-locking mechanism comprises two universal wheel assemblies (1), each of the universal wheel assemblies (1) being provided with a locking rod (2), and the driving mechanism (3) can simultaneously drive the two locking rods (2) to rotate relative to the trailer (200) through the transmission assembly (4), so as to lock and unlock the two universal wheel assemblies (1).

10. A logistics vehicle, characterized in that: The invention comprises a tractor (100), a trailer (200), and a self-locking mechanism according to any one of claims 1 to 9, wherein the self-locking mechanism is arranged between the tractor (100) and the trailer (200), and the tractor (100) is connected to the trailer (200) and can drive the trailer (200) to travel or turn.

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