Device for connecting trailer load and trailer hook ball head

Abstract

The utility model discloses a device for connecting a trailer load and a trailer hook ball head, which comprises a base connected to the trailer load; the clamping mechanism is used for clamping the tow hook ball head, the clamping mechanism comprises two clamping components, and at least one clamping component is pivoted to the base, so that an openable space for receiving the tow hook ball head is formed by the two clamping components; the device further comprises at least one locking member operably pivoted to the base, the locking member comprises a locking surface with a circular arc profile, and the central axis of the circular arc profile coincides with the pivoting axis of the locking member. The locking face is allowed to abut against the pivotable clamping component within the range of the central angle of the circular-arc-shaped outline so that the clamping state of the clamping mechanism can be locked. The ball head connector has the advantage of solving the problem that the existing ball head connector is easy to loosen. The clamping mechanism can be firmly connected with the connecting ball head for a long time, and dragging safety is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle connecting device, concretely relates to the device for trailer load and trailer hook ball head connection. BACKGROUND

[0002] Some equipment of prior art such as house car, yacht and drag bucket need to be connected to power car rear tow by ball head connecting piece. Ball head is assembled at the tail of vehicle, and connector is arranged on drag bucket and connected with ball head, and the commonly used ball head connector structure is named as "a trailer tail trailer ball clamping connector" disclosed in Chinese patent publication No. CN221913951U, and the ball clamping connector is provided with movable ball clamping block and fixed ball clamping block in base, and by pulling rotating handle, rotating handle drives rotation relative to rotating seat, so that connecting rod is moved, and movable ball clamping block is rotated on upper shaft rod, and the clamping or loosening adjustment of ball clamping is realized. The impact of ball clamping on movable ball clamping block during vehicle movement can drive connecting rod to move rotating handle, and movable ball clamping block appears loose, and ball clamping and shell are easily separated. UTILITY MODEL CONTENT

[0003] The utility model aims at providing the device for trailer load and trailer hook ball head connection, and can effectively solve the problem that trailer load and trailer hook ball head connection are easy to loosen.

[0004] In order to solve the above technical problem, the utility model is realized by the following technical scheme:

[0005] The device for trailer load and trailer hook ball head connection includes:

[0006] The base is connected to the trailer load, and

[0007] The clamping mechanism is used for clamping the trailer hook ball head, and the clamping mechanism includes two clamping members, and at least one clamping member is pivotally connected to the base, so that the two clamping members form an openable and closable space for receiving the trailer hook ball head;

[0008] The device further includes at least one locking member pivotally connected to the base, and the locking member includes a locking surface with a circular arc profile, and the center axis of the circular arc profile coincides with the pivot axis of the locking member, and the locking surface is allowed to abut against the pivotable clamping member within the central angle range of the circular arc profile, so as to lock the clamping state of the clamping mechanism.

[0009] In the device for connecting the trailer load and the trailer hook ball head, the locking surface is configured as a partial spherical surface or a partial cylindrical surface. The locking surface is configured as a spherical surface or a partial cylindrical surface, both of which can obtain a larger central angle range to adapt to a larger range of impact of the clamping member, and ensure that the force applied by the clamping member to the locking member from multiple angles can be directed to the pivot axis of the locking member. In particular, when the trailer hook ball head is laterally displaced due to road bumps, the deflection of the clamping member will drive the contact point to slide along the spherical surface, and the contact angle is automatically corrected by the spherical curvature, thereby avoiding the edge stress concentration problem caused by the eccentric load in the traditional flat locking structure.

[0010] In the device for connecting the trailer load and the trailer hook ball head, the pivotable clamping member includes a pivot end of a pivot base and a free end away from the pivot end, and the locking surface is in abutment with the free end. The free end of the pivotable clamping member is most directly affected by external forces when clamping the trailer hook ball head, and the displacement change is also relatively large. Abutting the locking surface with the free end can most effectively limit the movement of the free end when the clamping mechanism is working, and the torque generated by the abutting force of the locking member to the clamping member will also be the largest. When the trailer hook ball head shakes or impacts during the driving of the trailer, the force acting on the free end will be directly transmitted to the locking surface, and the locking member can directly prevent the opening trend of the clamping member by virtue of the abutment of the locking surface and the free end, thereby avoiding the loss of clamping force. Compared with abutment at other positions, the clamping state of the clamping mechanism can be more reliably maintained to prevent the trailer hook ball head from being pulled out.

[0011] In the device for connecting the trailer load and the trailer hook ball head, a guide surface is provided on the pivotable clamping member to guide the abutment of the locking surface with the free end. The guide surface can provide a clear movement guide path for the locking surface of the locking member. During actual operation, the operator can quickly and smoothly abut the locking surface with the free end of the pivotable clamping member without precise alignment when rotating the locking member, thereby reducing the operation difficulty, saving the time for connecting the trailer load and the trailer hook ball head, and improving the work efficiency. The guide surface can also ensure that the locking surface can be precisely abutted with the free end at the best position each time, thereby ensuring the consistency of the locking effect. This avoids the problem of unstable locking caused by the deviation of the abutment position of the locking surface and the free end, and can stably maintain the clamping state of the clamping mechanism in any use environment, thereby ensuring the reliability of the connection between the trailer load and the trailer hook ball head during the driving of the trailer.

[0012] In the device for connecting the trailer load and the trailer hook ball head, the locking member includes a tail part away from the locking surface, and the tail part of the locking member is provided with a stopper protruding from the locking member. When the locking surface abuts against the pivotable clamping member, the stopper abuts against the limiting surface of the base to prevent the locking member from continuing to rotate. The cooperation between the stopper and the limiting surface of the base can accurately limit the rotation angle of the locking member. When the locking surface abuts against the pivotable clamping member to reach the optimal locking state, the stopper abuts against the limiting surface of the base to prevent the locking member from continuing to rotate. This ensures that the locking member can be accurately positioned in the effective locking position each time, avoids affecting the locking effect due to excessive rotation or insufficient rotation, and improves the stability and reliability of the connecting device.

[0013] In the device for connecting the trailer load and the trailer hook ball head, the rotation radius of the stopper is greater than the distance between the pivot axis of the locking member and the limiting surface of the base. When the stopper abuts against the limiting surface of the base, the operator can more intuitively feel that the locking member has reached the limit position due to the large rotation radius of the stopper, thereby avoiding excessive operation to cause damage to the locking member or locking failure. This to some extent standardizes the operation process, reduces the safety risk caused by misoperation, and ensures the personal safety of the operator and the safety of the trailer operation.

[0014] In the device for connecting the trailer load and the trailer hook ball head, the outer side of the base is pivotally connected with a rotating handle, the rotating handle drives the locking member to rotate between the locking position and the unlocking position, the locking member abuts against the pivotable clamping member when in the locking position, and the clamping mechanism is released from the clamping state when the locking member is in the unlocking position. The rotating handle is pivotally connected to the outer side of the base, and the locking member can be easily driven to rotate between the locking position and the unlocking position by driving the rotating handle. Compared with some devices that need to use additional tools or complex operations to realize locking and unlocking, this design greatly simplifies the operation process. The operator can quickly complete the connection or separation of the trailer load and the trailer hook ball head by directly pulling the rotating handle, thereby improving the work efficiency and saving the operation time. The operator can intuitively judge the working state of the locking member through the position of the rotating handle, and then know the clamping or releasing state of the clamping mechanism to the trailer hook ball head, thereby avoiding misoperation and enhancing the accuracy and safety of the operation.

[0015] In the device for connecting the trailer load and the trailer hook ball head, the side wall of the locking member or the base is provided with a limiting piece to limit the movement stroke of the locking member from the locking position to the unlocking position. The locking member can be prevented from excessive rotation beyond the normal working range, avoiding damage to the locking member or other related components caused by excessive rotation, ensuring the stability and reliability of the locking member, and prolonging the service life of the locking member. In addition, through the limitation of the limiting piece, the locking member can also be stopped at the set position, so that the rotating handle connected with the locking member can be stopped at a position convenient for gripping. At this time, the user can better grasp the rotating handle to lift the entire device and more accurately connect it with the trailer hook ball head.

[0016] In the device for connecting the trailer load and the trailer hook ball head, the rotating handle includes a handle, and when the movement stroke of the locking member is limited by the limiting piece, the handle is located directly above the center of gravity of the device. Since the handle is directly above the center of gravity of the device, the device is more balanced during operation and is not prone to shaking or deviation. The user does not need to deliberately adjust the force direction and intensity to overcome the influence of imbalance, and can more easily and accurately lift the device to connect it with the trailer hook ball head.

[0017] In the device for connecting the trailer load and the trailer hook ball head, the device further includes a handle lock assembly, the handle lock assembly includes a lock tongue pivoted to the base, the lock tongue includes a blocking position and a release position, when the lock tongue is in the blocking position, the lock tongue abuts against the rotating handle to prevent the rotating handle from driving the locking member to disengage from the locking position, and when the lock tongue is in the release position, the lock tongue is not on the movement track of the rotating handle. The handle lock assembly is equipped with the lock tongue having the blocking position and the release position. When the lock tongue is in the blocking position, the rotating handle is prevented from driving the locking member to unlock, and when the lock tongue is in the release position, the movement of the rotating handle is not affected. The handle lock assembly adds a safety protection to the trailer hook ball head connector, preventing the locking member from being accidentally unlocked due to misoperation or accidental collision during use, further improving the safety of the trailer hook ball head in the connected state, and ensuring the safe performance of the trailer operation.

[0018] In the device for connecting the trailer load and the trailer hook ball head, a blocking groove is formed in the rotating handle, and when the lock tongue is in the blocking position, the lock tongue is located in the blocking groove, and a blocking is formed between the lock tongue and the inner side wall of the blocking groove. The blocking groove can limit the two rotation directions of the rotating handle. When the lock tongue is located in the blocking groove, the locking member can be ensured to abut against the pivotable clamping member in the locking position, allowing the user to better determine the position of the locking member.

[0019] In the device for connecting the trailer load with the trailer hook ball head, the pusher is arranged on the pivotable clamping member and drives the pivotable clamping member to rotate, the pusher is located in front of the trailer hook ball head when the trailer hook ball head enters the openable and closable space, and the distance between the pusher and the trailer hook ball head is less than the distance between the pivotable clamping member in front of the trailer hook ball head and the trailer hook ball head. The pusher plays a role of pre-positioning and buffering. On one hand, when the trailer hook ball head is inserted between the movable clamping block and the fixed clamping block, the pivotable clamping member can be driven to rotate in the clamping direction to achieve pre-positioning and guide the trailer hook ball head to enter the openable and closable space accurately. On the other hand, when the trailer hook ball head is inserted into the openable and closable space, the trailer hook ball head can contact and drive the pusher to move first, so that part of kinetic energy is consumed, the trailer hook ball head is prevented from colliding with the pivotable clamping member directly, the pivotable clamping member is prevented from being damaged, the convenience and accuracy of the connection with the trailer hook ball head are improved, and the service life of the clamping mechanism is prolonged.

[0020] In the device for connecting the trailer load with the trailer hook ball head, the elastic driving element is arranged in the base and is in contact with the pivotable clamping member to drive the two clamping members to rotate away from each other. When the device is unlocked, the elastic driving element can automatically help the pivotable clamping member to open, so that the trailer hook ball head can be pulled out of the openable and closable space, without the need of additional complex operation, the convenience and efficiency of the unlocking operation are improved, the pivotable clamping member can be kept in a stable open position in a non-working state, the next use is facilitated, and the practicability of the device is improved.

[0021] In the device for connecting the trailer load with the trailer hook ball head, the two clamping members are pivotally connected to the base, the locking member is in abutment with one of the pivotable clamping members, and the adjusting bolt is in abutment with the other pivotable clamping member. The position of the other pivotable clamping member can be accurately adjusted through the adjusting bolt, so that the trailer hook ball head connector can adapt to trailer hook ball heads of different sizes, the relative clamping positions of the two clamping members can be adjusted when the clamping mechanism is worn or has a machining error, the universality and compatibility of the product are improved, diversified use requirements are met, the user can flexibly adjust according to actual conditions, and the practicability and application range of the device are improved.

[0022] Compared with the prior art, the device has the following advantages:

[0023] The problem of easy loosening of the connection between the trailer load and the trailer hook ball head is solved by setting the locking member and abutting the locking surface of the circular arc profile on the locking member against the pivotable clamping member to lock the clamping state of the clamping mechanism. By configuring the locking surface of the locking member as a circular arc profile and making the center axis of the circular arc profile coincide with the pivot axis of the locking member, when the pivotable clamping member exerts a force on the locking surface in the clamping state, the direction vector of the force is always directed to the pivot axis of the locking member. Since the force direction passes through the rotation center of the locking member, the net torque acting on the locking member is always zero. This design completely eliminates the phenomenon of accidental rotation unlocking of the locking member caused by vibration impact transmitted from the clamping member to the locking member when the vehicle bounces, and fundamentally solves the problem of loosening of the clamping caused by accumulation of inertial torque in the traditional linkage type locking mechanism.

[0024] The circular arc profile of the locking surface abuts against the clamping member within the range of the center angle to form a dynamically adaptive constraint boundary. When the clamping member produces a slight displacement due to load change, the locking surface automatically compensates for the displacement deviation through the continuous curvature change of the circular arc contact surface, keeps the force exerted by the clamping member on the locking member always directed to the pivot axis of the locking member, and significantly improves the anti-displacement capability of the clamping mechanism in complex road conditions. Compared with the traditional precise angle limiting structure, the tolerance design allows the clamping member to effectively contact the locking surface within a certain angle range, which can absorb the angle deviation of the clamping member during manufacturing and assembly, and avoid locking failure caused by machining errors.

[0025] The device structure is relatively simple, and only through the clever cooperation of the locking member and the clamping member, the stable locking function is realized, the number of parts is reduced, the structural complexity is reduced, not only convenient for production and manufacturing, but also reduce the production cost, at the same time improve the overall reliability of the device, reduce the probability of failure due to too many parts. This structure design makes the operation simple when connecting and separating the trailer load and the trailer hook ball head. When connection is needed, the trailer hook ball head is placed in the openable space formed by the two clamping members, and the locking member is operated to make the locking surface abut against the pivotable clamping member, so that the quick locking is completed; when separation is needed, the locking member is operated in reverse to release the abutting state, so that the clamping mechanism can be easily opened, and the whole operation process does not need complex steps and additional tools, saving operation time and labor cost. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a perspective view of the device for connecting the trailer load and the trailer hook ball head of the utility model in application;

[0027] Figure 2 It is a front view of the device for connecting the trailer load and the trailer hook ball head of the utility model in application in the locking state;

[0028] Figure 3This is a front view of the device of this utility model for connecting trailer loads and trailer hook ball joints in the unlocked state during application;

[0029] Figure 4 for Figure 2 Sectional view of AA;

[0030] Figure 5 This is a perspective view of the device for connecting a trailer load to a trailer hook ball joint in the locked state.

[0031] Figure 6 for Figure 3 BB section view;

[0032] Figure 7 This is a schematic diagram of the utility model device for connecting trailer loads and trailer hook ball joints from a locked state to an unlocked state.

[0033] Figure 8 This is an exploded view of the device for connecting trailer loads to trailer hook ball joints according to this utility model;

[0034] Figure 9 This is a schematic diagram of the locking component in this utility model;

[0035] Figure 10 This is a schematic diagram of the structure of the trailer hook ball head when it enters the openable space in this utility model;

[0036] Figure 11 This is a schematic diagram of the structure of the moving clamping block and the fixed clamping block of this utility model when they clamp the ball head of the trailer hook;

[0037] Figure 12 This is a perspective view of the movable clamping block in this utility model;

[0038] Figure 13 This is a perspective view of the clamping block in this utility model.

[0039] The attached figures are labeled as follows:

[0040] The device includes a main body 100, a base 110, a limiting surface 111, a movable clamping block 120, a clamping curved surface 121, a pushing component 123, a clearance gap 1231, a contact surface 124, a guiding surface 125, a rotating shaft 126, a recessed clearance area 127, a free end 128, a pivot end 129, a clearance structure 1291, a fixed clamping block 130, a locking component 140, a stop component 141, a limiting component 142, a locking surface 143, a guiding surface 144, a rotating handle 150, an operating handle 151, a stop groove 152, an elastic driving component 160, an adjusting seat 170, an adjusting bolt 171, a trailer hook ball head 200, a handle lock assembly 300, a locking tongue 310, and a frame 400. Detailed Implementation

[0041] The device for connecting the trailer load with the trailer hook ball head 200 comprises a base 110 connected to the trailer load, and a clamping mechanism for clamping the trailer hook ball head 200, the clamping mechanism comprising two clamping members, at least one of which is pivotally connected to the base 110, so that the two clamping members form an openable space for receiving the trailer hook ball head 200; the device further comprises at least one locking member 140 pivotally connected to the base 110, the locking member 140 comprising a locking surface 143 with a circular arc profile, the center axis of the circular arc profile coincides with the pivot axis of the locking member 140, allowing the locking surface 143 to abut against the pivotable clamping member within the range of the central angle of the circular arc profile, to lock the clamping state of the clamping mechanism.

[0042] By setting the locking member 140 and abutting the locking surface 143 with a circular arc profile on the locking member 140 against the pivotable clamping member to lock the clamping state of the clamping mechanism, the problem of easy loosening of the existing connection between the trailer load and the trailer hook ball head 200 is solved. By configuring the locking surface 143 of the locking member 140 as a circular arc profile and making its central axis coincide with the pivot axis of the locking member 140 itself, when the pivotable clamping member exerts a force on the locking surface 143 in the clamped state, the direction vector of the force is always directed to the pivot axis of the locking member 140. Since the direction of the force passes through the center of rotation of the locking member 140, the net torque on the locking member 140 is always zero. This design completely eliminates the accidental rotation unlocking phenomenon caused by vibration impact transmitted to the locking member 140 through the clamping member when the vehicle is jolted, and fundamentally solves the clamping loosening problem caused by the accumulation of inertial torque in the traditional linkage locking mechanism.

[0043] The circular arc profile of the locking surface 143 abuts against the clamping member within the range of the central angle, forming a dynamically adaptive constraint boundary. When the clamping member produces a slight displacement due to load changes, the locking surface 143 automatically compensates for the displacement deviation through the continuous curvature change of the circular arc contact surface, keeping the force of the clamping member on the locking member 140 always directed to the pivot axis of the locking member 140, significantly improving the anti-displacement ability of the clamping mechanism in complex road conditions. Compared with the traditional precise angle limiting structure, the clamping member is allowed to effectively contact the locking surface 143 within a certain angle range, and this tolerance design can absorb the angle deviation of the clamping member during manufacturing and assembly, avoiding locking failure caused by machining errors.

[0044] The device structure is relatively simple, and only through the ingenious cooperation of the locking member 140 and the clamping member, the stable locking function is realized, the number of parts is reduced, the structural complexity is reduced, not only the production and manufacturing are facilitated, but also the production cost is reduced, and the overall reliability of the device is improved, and the probability of malfunction due to too many parts is reduced. The structure design makes the operation simple when connecting and separating the trailer load and the trailer hook ball head 200. When connection is needed, the trailer hook ball head 200 is placed in the openable and closable space formed by the two clamping members, and the locking member 140 is operated to make the locking surface 143 abut against the pivotable clamping member, so that the quick locking is completed; when separation is needed, the locking member 140 is operated in reverse to release the abutting state, so that the clamping mechanism can be easily opened, and the whole operation process does not need complex steps and additional tools, and the operation time and labor cost are saved.

[0045] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation of the utility model.

[0046] In the description of the utility model, it is understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model.

[0047] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0048] In the utility model, unless another definite provision and limitation, the terms "mount", "link", "connect", "fix" and so on should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection or each other can communicate;Can be direct connection, also can indirectly connect through the intermediate medium, can be two element inside the communication or two element's interaction relationship, unless another definite limitation. For the ordinary skilled in the art, the above terms can be understood according to the specific meaning in the utility model of specific circumstances.

[0049] Embodiment one:

[0050] Refer to Figures 1 to 10 For the embodiment one of the utility model for trailer load and trailer hook ball head connection device, the device for trailer load and trailer hook ball head connection device includes device body 100, and device body 100 is fixedly connected with trailer load, such as in the embodiment, the trailer load is the frame 400 of trailer, the bottom of the frame 400 of trailer is equipped with the gyro wheel, and the frame 400 can be placed bicycle or other articles;Trailer hook ball head 200 is fixedly connected with vehicle, and the trailer hook ball head 200 includes ball and connecting rod connected with ball, and the ball is fixedly connected with vehicle through connecting rod. Device body 100 and trailer hook ball head 200 are detachably connected to facilitate user use, in order to ensure that trailer hook ball head 200 and device body 100 can be clamped, the diameter of connecting rod is less than the diameter of ball.

[0051] Device body 100 includes base 110, clamping mechanism arranged in base 110, and base is connected with trailer load, and clamping mechanism is used to clamp trailer hook ball head 200. Clamping mechanism includes two clamping members, and at least one clamping member is pivotally connected to base 110, so that the two clamping members form openable and closable space for receiving trailer hook ball head 200. That is, the two clamping members in clamping mechanism can only one can rotate relative to base, or both can rotate relative to base, in order to more conveniently explain, two clamping members are defined as movable clamping block 120 and fixed clamping block 130 in the embodiment, movable clamping block 120 is pivotable clamping member, that is, movable clamping block 120 can rotate relative to base 110, and the rotation of movable clamping block 120 can control the opening and closing of openable and closable space, and movable clamping block 120 is fixedly connected with base, or movable clamping block 120 is basically stationary, and only position fine adjustment is carried out when necessary.

[0052] The base 110 mainly plays a protection and accommodation role. The base 110 in the embodiment is a cuboid structure. The opposite inner walls of the movable clamping block 120 and the fixed clamping block 130 are each provided with a clamping curved surface 121 for cooperating with and clamping the trailer hook ball head 200. For example, the clamping curved surface 121 is provided in a hemispherical shape. In this way, after the movable clamping block 120 and the fixed clamping block 130 are closed, the two clamping curved surfaces 121 can be combined into a spherical openable and closable space for cooperating with the trailer hook ball head 200, wrapping the trailer hook ball head 200, and achieving the fixed connection between the device body 100 and the trailer hook ball head 200.

[0053] The base 110 near the movable clamping block 120 is pivotally connected with a locking member 140. The locking member 140 rotates between a locking position and an unlocking position. When the locking member 140 is in the locking position, the locking member 140 limits the movement of the movable clamping block 120, and keeps the movable clamping block 120 in the position of the openable and closable space. When the locking member 140 is in the unlocking position, the locking member 140 does not limit the movement of the movable clamping block 120. In the embodiment, the locking member 140 is taken as an example in a cuboid structure. The locking member 140 includes a head portion and a tail portion. The tail portion of the locking member 140 is connected with the base 110 through a shaft coupling, so that the locking member 140 is pivotally connected with the base. The head portion of the locking member 140 can abut against the movable clamping block 120, so that the shaft coupling is kept at a distance from the movable clamping block 120, and the movable clamping block 120 has a larger swinging distance to provide sufficient space for cooperating with the trailer hook ball head 200.

[0054] The head portion of the locking member 140 is provided with an arc-shaped locking surface 143. The center axis of the arc-shaped locking surface 143 coincides with the pivot axis of the locking member 140. The locking surface 143 abuts against the movable clamping block 120 within the range of the central angle of the arc-shaped locking surface 143. At this time, the force direction of the movable clamping block 120 acting on the locking member 140 points to the rotation center of the locking member 140, that is, the common normal line direction at the contact point between the movable clamping block 120 and the locking member 140 points to the rotation center of the locking member 140, so that the torque generated by the force of the movable clamping block 120 acting on the locking member 140 is zero. During the movement of the vehicle, when the movable clamping block 120 is subjected to vibration or other external force, the locking member 140 cannot be pushed away from the locking position abutting against the movable clamping block 120, so as to fix the relative position between the movable clamping block 120 and the fixed clamping block 130, avoid the loosening of the connector, ensure that the device body 100 can be long-term and firmly connected with the trailer hook ball head 200, and ensure the safety of the towing.

[0055] In the above embodiments, the locking surface 143 is configured as a partial spherical surface or a partial cylindrical surface, that is, the projection of the locking surface 143 in the rotation plane of the locking member 140 is a circular arc. A larger central angle range can be obtained to accommodate a larger range of impact of the clamping member, ensuring that the force exerted by the movable clamp block 120 on the locking member 140 from multiple angles can be directed to the pivot axis of the locking member 140. In particular, when the trailer hook ball head 200 is laterally displaced due to road bumps, the deflection of the clamping member will drive the contact point to slide along the spherical surface, automatically correcting the contact angle through the spherical curvature, avoiding the edge stress concentration problem caused by the traditional flat locking structure due to the eccentric load.

[0056] For the connection of the movable clamp block 120 and the base 110, the upper end of the movable clamp block 120 is a pivot end, which is pivotally connected to the base 110 through the pivot shaft 126, and the lower end of the movable clamp block 120 is a free end that can rotate relative to the pivot shaft 126. When the free end of the movable clamp block 120 is away from the fixed clamp block 130, the openable and closable space is in an open state, and the trailer hook ball head 200 can be conveniently entered or removed from the openable and closable space; when the free end of the movable clamp block 120 is close to the fixed clamp block 130, the openable and closable space is in a closed state, and the ball head inserted into the openable and closable space can be locked therein to complete the connection of the connector.

[0057] The free end of the movable clamp block 120 is provided with an abutting surface 124, that is, the locking surface 143 of the locking member 140 abuts against the abutting surface 124 of the free end of the movable clamp block 120, and the abutting force generated by the locking member 140 can have a larger force arm relative to the pivot shaft 126 of the movable clamp block 120, which is more conducive to maintaining the locked state of the movable clamp block 120 when the locking member 140 is in the locked position. The guide surface 125 is located on the outer wall of the movable clamp block 120 between the pivot shaft 126 and the abutting surface 124, and when the locking member 140 rotates from the unlocked position to the locked position, it smoothly pushes the movable clamp block 120 to rotate and allows the locking member 140 to abut against the abutting surface 124, thereby completing the locking of the movable clamp block 120.

[0058] On the basis of the above-mentioned embodiments, for the structure of the movable clamp block 120, in order not to affect the connection relationship between the movable clamp block 120 and the trailer hook ball head 200 when the locking member 140 abuts against the abutting surface 124, the abutting surface 124 is generally arranged on the outer wall of the movable clamp block 120 away from the fixed clamp block 130, and a guide surface 125 is further arranged on the outer wall, the guide surface 125 is connected with the abutting surface 124, the locking member 140 pushes the movable clamp block 120 to rotate towards the fixed clamp block 130 along the guide surface 125, the cross section of the guide surface 125 is in the shape of a circular arc, so that when the locking member 140 acts on the guide surface 125, the movable clamp block 120 can be smoothly rotated, and the jamming condition can be avoided. By arranging the guide surface 125, the locking member 140 can also be pushed to rotate the movable clamp block 120 towards the fixed clamp block 130 while being turned from the unlocking position to the locking position, the guide surface 125 precisely guides the movement of the movable clamp block 120, so that the movable clamp block 120 can more accurately approach the fixed clamp block 130 and realize the clamping of the trailer hook ball head 200.

[0059] A stop piece 141 protruding from the locking member 140 is arranged at the tail of the locking member 140, when the locking member 140 is rotated to the locking position, the stop piece 141 abuts against the limiting surface 111 of the base 110 to prevent the locking member 140 from continuing to rotate. In the embodiment, the stop piece 141 is integrally arranged with the locking member 140, when the locking member 140 is rotated from the unlocking position to the locking position, the positioning of the locking member 140 is realized by the abutment between the stop piece 141 and the limiting surface 111, that is, after the abutment between the stop piece 141 and the limiting surface 111, the locking member 140 cannot continue to rotate, at this time, the locking member 140 is located at the locking position, and through the stop piece 141, it is ensured that the locking member 140 can accurately stay at the locking position when the locking member 140 is controlled by rotating the handle 150, and the problem that the locking member 140 cannot be locked to the movable clamp block 120 after rotating through the locking position will not occur. Further, the stop surface can be the side wall of the base 110, so that the stop surface does not need to be formed by additionally arranging components, the rotation radius R of the stop piece 141 is greater than the distance L between the rotation axis of the locking member 140 and the adjacent side wall of the base 110, when the locking member 140 is at the locking position, the stop piece 141 abuts against the side wall of the base 110, so as to ensure that the locking member 140 is accurately located at the locking position.

[0060] In addition to the abutment of the stopper 141 and the side wall of the base 110, a protrusion can be arranged on the side wall of the base 110 towards the rotation axis direction of the locking member 140, and the protrusion and the stopper 141 abut to stop the stopper 141. Since the protrusion protrudes from the side wall of the base 110, the stopper 141 will apply force to the protrusion in a tangent direction. By designing the position of the stopper 141 when the locking member 140 is in the locking position, the force of the stopper 141 on the protrusion can only generate a small component perpendicular to the side wall of the base 110, which reduces the deformation of the base 110 caused by the force of the locking member 140, and allows the locking member 140 to be more accurately stopped at the locking position.

[0061] Further, a guide surface 144 is arranged between the locking surface 143 and the bottom surface of the locking member 140, and the rotation radius of the guide surface 144 is smaller than that of the locking surface 143, so that the locking member 140 rotates to push the movable clamp block 120 to produce one-way displacement. The guide surface 144 can be a slope or an arc surface, and an arc surface is preferred. When the guide surface 144 contacts the movable clamp block and pushes the movable clamp block 120 over the transition locking surface 143 to push the movable clamp block 120, it can ensure the smooth rotation of the movable clamp block 120 and reduce the impact. Moreover, since the rotation radius of the guide surface 144 is smaller than that of the locking surface 143, when the guide surface 144 is switched to the locking surface 143 and contacts the movable clamp block 120, the movable clamp block 120 will not back off, and the movable clamp block 120 will always rotate towards the fixed clamp block 130 during clamping, reducing the loosening of the trailer hook ball head 200 when the locking member 140 is in the locking position.

[0062] On the basis of the above embodiment, in order to more conveniently control the switching of the locking member 140 between the locking position and the unlocking position, a rotating handle 150 is rotatably connected to the outside of the base 110 to drive the movable clamp block 120 to rotate towards the fixed clamp block 130. The rotating handle 150 can control the rotation of the movable clamp block 120 towards the fixed clamp block 130 to realize the convergence of the movable clamp block 120 and the fixed clamp block 130. The rotating handle 150 drives the rotation of the locking member 140, and then the locking member 140 controls the rotation of the movable clamp block 120 towards the fixed clamp block 130. To realize the rotation of the rotating handle 150 driving the locking member 140, the shaft of the locking member 140 and the base 110 can be extended, so that one end of the rotating handle 150 and the locking member 140 are fixed on the same shaft, and the other end of the rotating handle 150 is provided with a handle 151 for convenient operation.

[0063] Further, the locking member 140 is in the unlocking position as long as it is away from the abutting surface 124, but when the device body 100 is assembled with the trailer hook ball head 200, the device body 100 is first too high and then placed downward to be connected with the trailer hook ball head 200, in order to facilitate this moving process, the user will directly hold the rotating handle 150 to pull up the device body 100. In the embodiment, the rotating handle 150 is in the preferred holding and pulling position by limiting the position of the locking member 140 in the unlocking position. Specifically, along the direction of the rotation of the locking member 140 from the locking position to the unlocking position, the end surface of the base 110 is provided with 142, when 142 abuts against the side wall of the base 110, that is, when the movement stroke of the locking member 140 is limited by 142, the operating handle 151 is located on the vertical axis passing through the center of gravity of the device body 100, and in the operation process, the user does not need to deliberately adjust the force direction and intensity to overcome the influence of the imbalance, so that the device body 100 can be more easily and accurately pulled up to be connected with the trailer hook ball head 200, facilitating the user to pull up. And when it is necessary to control the movement position of the locking member 140, the rotating handle 150 is rotated to realize the locking and unlocking actions of the locking member 140, improving the operation efficiency. In addition to setting 142 on the locking member 140, 142 can also be set on the side wall of the base 110, which can also have the same limiting effect.

[0064] On the basis of the above embodiment, the trailer hook ball head connector further comprises a handle lock assembly 300, and the handle lock assembly 300 comprises a lock tongue 310 rotatably arranged on the base 110. The lock tongue 310 comprises a stop position and a release position. When the lock tongue 310 is in the stop position, the lock tongue 310 abuts against the rotating handle 150, preventing the rotating handle 150 from driving the locking member 140 to be away from the locking position, and preventing the rotating handle 150 from being accidentally touched to cause the device body 100 to be unlocked from the trailer hook ball head 200. When the lock tongue 310 is in the release position, the lock tongue 310 moves out of the movement track of the rotating handle 150, so that the rotating handle 150 can be freely rotated. By setting the handle lock assembly 300, it is ensured that the rotating handle 150 will not be accidentally opened during the towing process, improving the safety of the trailer hook ball head connector in the connected state, and ensuring the safe performance of the trailer hook operation.

[0065] Further, the rotating handle 150 is provided with a stop groove 152, when the locking tongue 310 is in the stop position, the locking tongue 310 is located in the stop groove 152, and the locking tongue 310 and the inner side wall of the stop groove 152 form a stop, so that the locking tongue 310 can limit the rotating handle 150 in two directions of rotation, not only can avoid the accidental rotation of the rotating handle 150 in the connected state causing the locking jaw to deviate from the locking position, but also can make the rotating handle 150 always in the locking position of the locking member 140, and the user can also judge whether the locking member 140 is in the locking position through whether the locking tongue 310 can be turned into the stop groove 152, so that the user can better determine the position of the locking member 140.

[0066] When it is necessary to realize the connection of the device body 100 and the trailer hook ball head 200, the movable clamp block 120 will be rotated and swung first, and the distance between the movable clamp block 120 and the fixed clamp block 130 is maximum. Since the device body 100 is connected with the trailer hook ball head 200 by lifting the device body 100 to align and put down the trailer hook ball head 200, the trailer hook ball head 200 will first touch the movable clamp block 120 and drive the movable clamp block 120 to fold towards the fixed clamp block 130. During this process, the trailer hook ball head 200 will generate a large impact on the movable clamp block 120, which is easy to cause damage to the movable clamp block 120 and cannot be normally rotated and folded with the fixed clamp block 130. Therefore, the movable clamp block 120 is provided with a pushing piece 123 for driving the movable clamp block 120 to rotate, and the pushing piece 123 is located above the trailer hook ball head 200. When the trailer hook ball head 200 enters the clamping curved surface 121, the trailer hook ball head 200 abuts against the pushing piece 123, drives the movable clamp block 120 to rotate and clamp with the fixed clamp block 130, that is, the pushing piece 123 absorbs the impulse of the trailer hook ball head 200, plays a buffering role, and also realizes the purpose of driving the movable clamp block 120 to fold with the fixed clamp block 130. When the movable clamp block 120 rotates to the maximum opening angle, the top horizontal height of the pushing piece 123 relative to the movable clamp block 120 is lower, so as to ensure that the trailer hook ball head 200 first contacts the pushing piece 123 after entering the clamping curved surface 121, and avoid the trailer hook ball head 200 directly impacting the movable clamp block 120.

[0067] In the embodiment, the fixed clamp block 130 can also be pivoted on the base through the rotating shaft, but the fixed clamp block 130 is generally stationary when clamping the trailer hook ball head 200. However, due to manufacturing errors or wear after long-term use, the distance between the movable clamp block 120 and the fixed clamp block 130 can be too large or too small after the movable clamp block 120 is abutted by the locking member 140 to the locked position, at which time the fixed clamp block 130 needs to be fine-tuned, therefore, an adjusting seat 170 is arranged on the side wall of the base 110 close to the fixed clamp block 130, and an adjusting bolt 171 is threadedly installed on the adjusting seat 170, one end of the adjusting bolt 171 abuts against the outer wall of the fixed clamp block 130, and the distance between the fixed clamp block 130 and the movable clamp block 120 in the locked position is adjusted by rotating the adjusting bolt 171 relative to the adjusting seat 170. The upper part of the fixed clamp block 130 is also connected to the base 110 through the rotating shaft 126, and one end of the adjusting bolt 171 generally abuts against the bottom of the fixed clamp block 130 to obtain a larger adjusting torque. The position of the fixed clamp block 130 is accurately adjusted by the adjusting bolt 171, so that the trailer hook ball head connector can adapt to trailer hook ball heads 200 of different sizes, improve the versatility and compatibility of the product, meet the diversified use requirements, and the user can flexibly adjust according to the actual situation, thereby improving the practicality and application range of the connector.

[0068] In order to better release the trailer hook ball head 200 after the locking member 140 deviates from the locked position, the movable clamp block 120 can automatically separate from the fixed clamp block 130, on the basis of the above embodiment, an elastic driving member 160 can be arranged in the base 110, the elastic driving member 160 abuts against the movable clamp block 120 to generate a driving force for driving the movable clamp block 120 to rotate away from the fixed clamp block 130. Figure 8 、 Figure 10 As described above, the elastic driving member 160 is fixed in the base 110, the elastic driving member 160 has two elastic legs which respectively abut against the fixed clamp block 130 and the movable clamp block 120, when the movable clamp block 120 rotates towards the fixed clamp block 130, the distance between the two elastic legs becomes smaller, and the elastic driving member 160 is subjected to extrusion to accumulate elastic potential energy; when the locking member 140 is removed, the movable clamp block 120 loses the abutting force of the locking member 140, and the elastic potential energy is released, so that the elastic driving member 160 can drive the movable clamp block 120 to rotate away from the fixed clamp block 130 to open the two clamping curved surfaces 121. In addition to the above-mentioned elastic driving member 160, a torsional spring can also be directly sleeved on the rotating shaft 126 of the movable clamp block 120 to achieve the above-mentioned function.

[0069] In use, according to the size of the trailer ball 200 and the error between the movable clamp block 120 and the fixed clamp block 130, the position of the lower end of the fixed clamp block 130 is adjusted by the adjusting bolt 171, the rotating handle 150 is pulled to drive the locking member 140 to the unlocking position, the operating handle 151 of the rotating handle 150 is located directly above the center of gravity of the device body 100, the device body 100 is lifted by the rotating handle 150, and the movable clamp block 120 is rotated under the driving of the elastic driving member 160, so that the lower end of the movable clamp block 120 is opened to the maximum angle with the lower end of the fixed clamp block 130. The device body 100 is aligned with the trailer ball 200, the device body 100 is lowered, the trailer ball 200 enters the openable and closable space between the movable clamp block 120 and the fixed clamp block 130, the trailer ball 200 abuts against the pushing member 123, the movable clamp block 120 is pushed to rotate, the movable clamp block 120 is closed with the fixed clamp block 130 to clamp the trailer ball 200, and then the rotating handle 150 is pulled downward, the rotating handle 150 drives the locking member 140 to the locking position from the unlocking position, in this process, the locking member 140 moves along the guide surface 125 of the movable clamp block 120 to the abutting surface 124, so that the movable clamp block 120 is in the locked state. When the stopper 141 connected to the locking member 140 abuts against the side wall of the base 110, the rotating handle 150 cannot continue to rotate, which indicates that the locking member 140 is in the locking position, the lock tongue 310 is rotated to the stop position, the rotating handle 150 is locked, and the connection between the device body 100 and the trailer ball 200 is completed. If it is necessary to unlock, the lock tongue 310 is rotated to the release position, the rotating handle 150 is pulled to release the locking of the movable clamp block 120 by the locking member 140, the movable clamp block 120 is rotated to be opened, and the trailer ball 200 is released. When the locking member 140 is in the locking position, the abutting surface 124 of the movable clamp block 120 abuts against the locking member 140, and the tangent of the abutting surface 124 at the position intersects with the rotation axis of the locking member 140, that is, the force of the movable clamp block 120 on the locking member 140 passes through the axis of the locking member 140, the torque generated by the force of the movable clamp block 120 on the locking member 140 is zero, the locking member 140 will not be deflected due to the impact of the movable clamp block 120, the relative position of the movable clamp block 120 and the fixed clamp block 130 is fixed, the connector is prevented from loosening, the device body 100 can be connected with the trailer ball 200 stably for a long time, and the safety of towing is ensured.

[0070] The above embodiment mainly introduces a pivotable clamp member and a substantially fixed clamp member, and of course, both the clamp members can be pivotable clamp members, and the pivotable clamp member and the connecting member thereof in the above embodiment are mirrored along the joint surface between the two clamp members to have the same structure, so that when it is necessary to open the openable and closable space, the two clamp members are controlled to rotate in opposite directions to be opened, and when it is necessary to close the openable and closable space, the two clamp members are controlled to rotate in the opposite direction to be closed.

[0071] Embodiment Two

[0072] This embodiment can be implemented on the basis of Embodiment One, or can be implemented independently. This embodiment is mainly an embodiment for improving the specific structure of the clamping member.

[0073] As shown in Figure 1 , the device for connecting the trailer load and the trailer hook ball head includes a device body 100, which is fixedly connected with the trailer load, such as the frame 400 of the trailer in this embodiment, the bottom of the frame 400 is provided with a roller, and the frame 400 can accommodate a bicycle or other articles; the trailer hook ball head 200 is fixedly connected with the vehicle, and the trailer hook ball head 200 includes a ball and a connecting rod connected with the ball, and the ball is fixedly connected with the vehicle through the connecting rod. The device body 100 and the trailer hook ball head 200 are detachably connected to facilitate user use, and in order to ensure that the trailer hook ball head 200 can be clamped with the device body 100, the diameter of the connecting rod is smaller than the diameter of the ball.

[0074] As shown in Figures 11 to 13 , the device body 100 includes a base 110 and a clamping mechanism arranged in the base 110, the base is connected with the trailer load, and the clamping mechanism is used for clamping the trailer hook ball head 200. The clamping mechanism includes two clamping members, at least one clamping member is pivotally connected to the base 110, so that the two clamping members form an openable and closable space for receiving the trailer hook ball head 200. That is, the two clamping members in the clamping mechanism can only one be rotatable relative to the base, or both can be rotatable relative to the base.

[0075] In order to facilitate the description, the two clamping members are defined as a movable clamping block 120 and a fixed clamping block 130 in this embodiment. The movable clamping block 120 is a pivotable clamping member, that is, the movable clamping block 120 can rotate relative to the base 110, and controlling the rotation of the movable clamping block 120 can control the opening and closing of the openable and closable space, while the movable clamping block 120 is fixedly connected with the base, or the movable clamping block 120 is basically stationary, and only needs to be slightly adjusted in position when necessary.

[0076] The dynamic clamp block 120 and the fixed clamp block 130 are symmetrically arranged and oppositely arranged, and the inner walls of the dynamic clamp block 120 and the fixed clamp block 130 are respectively provided with clamping curved surfaces 121 matched with the surface of the trailer hook ball head 200. When the dynamic clamp block 120 and the fixed clamp block 130 are closed, the two clamping curved surfaces 121 are combined to form an openable and closable space for clamping the trailer hook ball head 200. The clamping curved surfaces 121 on the existing dynamic clamp block 120 and the fixed clamp block 130 are all semispherical grooves, and the two clamping curved surfaces 121 are combined to form a spherical openable and closable space matched with the trailer hook ball head 200. However, the structure causes the stress to be concentrated in the area with the largest radial dimension of the trailer hook ball head 200. If the trailer hook ball head 200 is spherical, the stress is concentrated on the equator of the trailer hook ball head 200, that is, the area with the largest radial profile of the trailer hook ball head 200, so that the clamping of the ball is unstable and the trailer hook ball head 200 shakes during the towing process.

[0077] Therefore, in the embodiment, the clamping curved surface 121 is provided with a recessed avoiding area 127. The recessed avoiding area 127 corresponds to the gap between the profile of the trailer hook ball head 200, that is, the recessed avoiding area 127 is not in contact with the trailer hook ball head 200 after the dynamic clamp block 120 and the fixed clamp block 130 are closed. The clamping force points generated by the dynamic clamp block 120 and the fixed clamp block 130 are transferred to the symmetric areas on both sides of the recessed avoiding area 127, forming a mechanical model similar to “two-point clamping”, so that the clamping of the dynamic clamp block 120 and the fixed clamp block 130 on the trailer hook ball head 200 is more stable.

[0078] In the embodiment, the recessed avoiding areas 127 on the two clamping curved surfaces 121 correspond to the profiles of the two ends of the diameter of the trailer hook ball head, respectively. The maximum length of the horizontal line connecting the clamping curved surface on the dynamic clamp block 120 to the clamping curved surface 121 on the fixed clamp block 130 is less than the diameter of the trailer hook ball head 200, that is, the recessed avoiding area 127 needs to avoid the equator of the trailer hook ball head 200 and expand in the vertical direction by a certain area. Moreover, the joint surface of the dynamic clamp block 120 and the fixed clamp block 130 is a vertical surface, the equatorial surface of the trailer hook ball head 200 is in a horizontal plane, the recessed avoiding areas 127 on the two clamping curved surfaces 121 correspond to the equatorial surface of the trailer hook ball head 200, so that the force of the trailer hook ball head 200 on the clamping curved surface 121 is more evenly distributed to the clamping member, avoiding that the clamping member is locally stressed too much. The recessed avoiding area 127 accounts for about 20% to 40% of the area of the entire clamping curved surface 121. A too small recessed avoiding area 127 cannot play an effective avoiding role, and a too large recessed avoiding area will affect the clamping effect of the dynamic clamp block 120 and the fixed clamp block 130 on the trailer hook ball head 200. Of course, the profiles of the two recessed avoiding areas 127 corresponding to the trailer hook ball head 200 deviate from the equator of the trailer hook ball head 200, and the purpose of the utility model can also be achieved.

[0079] Further, as shown in FIG. 6, the dynamic clamp block 120 and the fixed clamp block 130 are provided with a plurality of clamping curved surfaces 121, and the clamping curved surfaces 121 are arranged in a staggered manner. Figure 12 、 Figure 13As shown, the cross section of the recessed avoidance zone 127 is arc-shaped, which can avoid stress concentration and disperse the local load along the tangent direction when the surface of the trailer hook ball head 200 is fitted. In addition to the arc-shaped cross section, the cross section can also be rectangular, which is equivalent to a straight groove design that can be quickly formed.

[0080] In this embodiment, the recessed avoidance zone 127 is a ring-shaped avoidance groove, that is, a through hole is provided in the center of the recessed avoidance zone 127. Through the ring-shaped avoidance groove, the slot can be adapted to the larger diameter trailer hook ball head 200, and the equator of the trailer hook ball head 200 is avoided. The smaller diameter trailer hook ball head 200 can pass through the avoidance groove center opening to avoid, so as to realize the adaptation to the trailer hook ball head 200 of different diameters, and the avoidance hole can allow the equatorial part of the trailer hook ball head 200 to protrude from the opening to the movable clamp block 120 or the fixed clamp block 130, which is beneficial to reduce the size of the movable clamp block 120 and the fixed clamp block 130 in the depth direction along the clamping curved surface 121. Moreover, the through hole can exhaust the air between the trailer hook ball head 200 and the recessed avoidance zone 127 when the movable clamp block 120 rotates to the fixed clamp block 130 to close the openable space, so that the closure of the openable space is more smooth.

[0081] Based on the above embodiment, as shown in the figure, Figure 11 The movable clamp block 120 in this embodiment is a vertical cuboid structure, the upper left corner of which is connected to the base 110 through the rotating shaft 126 to become the pivot end 129, and the lower part is the free end 128. The swing of the free end 128 controls the opening or closing of the openable space. In addition, the upper part of the movable clamp block 120 is also provided with the pivot end 129. When the free end 128 is opened outward, the upper right corner of the movable clamp block 120 will move downward, which may come into contact with the top of the trailer hook ball head 200, causing the trailer hook ball head 200 to be stuck and unable to exit the openable space. Therefore, it is necessary to avoid the above situation. In this embodiment, the clamping curved surface 121 near the pivot end 129 is provided with an avoidance structure 1291. When the movable clamp block 120 rotates around the rotating shaft 126 from the closed position to the open position, the avoidance structure 1291 is configured to prevent interference with the trailer hook ball head 200 in the disengaged state, so as to avoid the movable clamp block 120 being stuck with the trailer hook ball head 200 when the movable clamp block 120 rotates to the open position. The specific structure of the avoidance structure 1291 is not particularly limited, as long as the movable clamp block 120 does not interfere with the trailer hook ball head 200 when the movable clamp block 120 is opened. The specific shape and size of the avoidance structure 1291 can be determined according to the size of the movable clamp block 120 and the positional relationship between the upper right corner of the movable clamp block 120 and the rotating shaft 126.

[0082] Further, the avoidance structure 1291 is a concave cavity concave towards the openable space, the design of the concave cavity does not increase the size of the movable clamp block 120, and is obtained by cutting on the basis of the original movable clamp block 120, which is relatively simple to process and does not need to change the size of other parts. Even if the trailer hook ball head 200 shakes to a certain extent or is cheap, the concave cavity can effectively accommodate the ball head and ensure that the movable clamp block 120 is smoothly opened.

[0083] On the basis of the above-mentioned embodiments, the movable clamp block 120 needs to be opened first to allow the trailer hook ball head 200 to enter the openable space. When the movable clamp block 120 is opened, the upper right corner of the movable clamp block 120 rotates downward into the openable space. When the trailer hook ball head 200 is pushed into the openable space, it will first abut against the inner side of the movable clamp block 120 close to the pivot end 129, pushing the movable clamp block 120 to rotate. In actual use, the user will lift the device body 100 to move above the trailer hook ball head 200 and then put it down. Therefore, when the trailer hook ball head 200 enters the openable space, it will produce a greater impact on the movable clamp block 120, which may cause damage to the movable clamp block 120 or affect the service life of the movable clamp block 120. In order to solve the above technical problems, a pushing piece 123 is arranged on the movable clamp block 120. When the trailer hook ball head 200 is inserted into the openable space, the trailer hook ball head 200 first contacts the pushing piece 123. By the trailer hook ball head 200 abutting against the pushing piece 123 upward, the movable clamp block 120 is driven to rotate in the closing direction. When the movable clamp block 120 is in the open position, the pushing piece 123 is located directly in front of the trailer hook ball head 200 entering the openable space, and the distance between the pushing piece and the trailer hook ball head 200 is less than the distance between the movable clamp block 120 directly in front of the trailer hook ball head 200 and the trailer hook ball head 200. That is, the pushing piece 123 needs to be deeper into the openable space, and the pushing piece 123 needs to contact the trailer hook ball head 200 first. As the trailer hook ball head 200 enters the openable space, the trailer hook ball head 200 will drive the pushing piece 123 to rotate, gradually closing the openable space. Of course, in order to better realize that the pushing piece 123 can drive the movable clamp block 120 to rotate when the pushing piece 123 is pushed by the trailer hook ball head 200, the pushing piece 123 is located at the end of the pivot end 129, so that the trailer hook ball head 200 can exert a larger torque on the pushing piece 123.

[0084] When the entire movable clamp block 120 is in the closed state, an avoidance gap 1231 is provided between the pushing piece 123 and the trailer hook ball head 200, which is to avoid the pushing piece 123 directly abutting against the trailer hook ball head 200, causing the pushing piece 123 and the trailer hook ball head 200 to be deadlocked when the movable clamp block 120 is opened, affecting the trailer hook ball head 200 to exit the openable space.

[0085] In addition, since the pushing piece 123 needs to bear the impact of the trailer hook ball head 200, the service life of the pushing piece 123 is lower than that of the movable clamp block 120, and therefore, in the embodiment, the pushing piece 123 and the movable clamp block 120 are fixed in a detachable connection mode, for example, the pushing piece 123 is fixed on the movable clamp block 120 by screws or buckles, so that the pushing piece 123 can be conveniently replaced when damaged.

[0086] In the embodiment, the recessed avoidance area 127 is arranged in the clamping curved surface 121, so that the problem that the ball head shakes in the towing process of the existing trailer hook ball head connector is solved. The ball head shape can be better fitted, the local stress concentration is reduced, the stability of the connection is improved, the ability of resisting lateral swing is significantly improved, the clearance of the avoidance area allows the trailer hook ball head 200 to produce limited micro deformation under dynamic working conditions, local stress concentration caused by rigid constraint is avoided, and the risk of fracture is reduced.

[0087] The other contents not described in the embodiment can be referred to the embodiment one.

[0088] The above only describes the specific embodiments of the utility model, but the technical features of the utility model are not limited to this, any person skilled in the art makes changes or modification in the field of the utility model, and the changes or modification are covered in the patent range of the utility model.

Claims

1. A device for connecting a trailer load with a trailer coupling ball, comprising: a base connected to the trailer load; and a clamping mechanism for clamping the trailer coupling ball, the clamping mechanism comprising two clamping members, at least one of which is pivotally connected to the base, such that the two clamping members form an openable space for receiving the trailer coupling ball; characterized in that the device further comprises at least one locking member pivotally connected to the base, the locking member comprising a locking surface having a circular arc profile, the center axis of the circular arc profile coinciding with the pivot axis of the locking member, allowing the locking surface to abut against the pivotable clamping member within the central angle of the circular arc profile to lock the clamping state of the clamping mechanism.

2. The apparatus for connecting a trailer load to a trailer hitch ball head of claim 1, wherein, The locking surface is configured as a partial spherical surface or a partial cylindrical surface.

3. The apparatus for connecting a trailer load to a trailer hitch ball head of claim 1, wherein, The pivotable clamping member comprises a pivot end pivotally connected to the base and a free end away from the pivot end, the locking surface abutting against the free end.

4. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 3, wherein, The pivotable clamping member is provided with a guide surface guiding the locking surface to abut against the free end.

5. The apparatus for connecting a trailer load to a trailer hitch ball head of claim 1, wherein, The locking member comprises a tail portion away from the locking surface, the tail portion of the locking member being provided with a stopper protruding from the locking member, the stopper abutting against a limiting surface of the base when the locking surface abuts against the pivotable clamping member to prevent the locking member from continuing to rotate.

6. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 5, wherein, The radius of rotation of the stopper is greater than the distance between the pivot axis of the locking member and the limiting surface of the base.

7. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 1, wherein, A rotating handle is pivotally connected to the outside of the base, the rotating handle driving the locking member to rotate between a locking position and an unlocking position, the locking member abutting against the pivotable clamping member when the locking member is in the locking position, the clamping mechanism being released from the clamping state when the locking member is in the unlocking position.

8. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 7, wherein, A limiting member is provided on the side wall of the locking member or the base to limit the movement stroke of the locking member from the locking position to the unlocking position.

9. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 8, wherein, The rotating handle comprises a handle knob, the handle knob being located directly above the center of gravity of the device when the movement stroke of the locking member is limited by the limiting member.

10. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 7, wherein, The device further comprises a handle lock assembly, the handle lock assembly comprising a lock tongue pivotally connected to the base, the lock tongue comprising a blocking position and a releasing position, the lock tongue abutting against the rotating handle when the lock tongue is in the blocking position to prevent the rotating handle from driving the locking member out of the locking position, the lock tongue not being in the movement track of the rotating handle when the lock tongue is in the releasing position.

11. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 10, wherein, The rotating handle is provided with a blocking groove, the lock tongue being located in the blocking groove when the lock tongue is in the blocking position, a stop being formed between the lock tongue and the inner side wall of the blocking groove.

12. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 1, wherein, The pivotable clamping member is provided with a pushing member driving the pivotable clamping member to rotate, the pushing member being located in the movement path directly in front of the trailer coupling ball entering the openable space, the distance between the pushing member and the trailer coupling ball being less than the distance between the pivotable clamping member directly in front of the trailer coupling ball entering the openable space and the trailer coupling ball.

13. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 1, wherein, The base is provided with an elastic driving member, the elastic driving member being in contact with the pivotable clamping member to drive the two clamping members to rotate away from each other.

14. The apparatus for connecting a trailer load with a trailer hitch ball head of claim 1, wherein, The two clamping members are pivotally connected to the base, the locking member abuts against one of the pivotable clamping members; the base is threadedly connected with an adjusting bolt, the adjusting bolt abuts against the other pivotable clamping member.

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