Quick-mounting trailer ball cover lock

Abstract

The application relates to the technical field of trailer connector, in particular to a quick-mounting trailer ball cover lock which greatly simplifies the operation process, significantly shortens the operation time, greatly improves the work efficiency, and is provided with a connecting arm mounted on a vehicle body, the connecting arm is provided with a connecting piece, a socket is formed in the connecting arm, a lock rod is connected to the socket in a plug-in manner, the insertion parts on the two sides of the lock rod penetrate the socket along the axial direction of the socket, a clamping block is mounted on the insertion part of the lock rod, a locking piece capable of automatically returning to the original position is mounted in the socket, a through hole is formed in the locking piece for the insertion part of the lock rod to pass through, and an opening is formed in the inner wall of the locking piece for the clamping block to pass through; when the insertion parts on the two sides of the lock rod are aligned with the socket and are subjected to a descending movement, the descending force of the clamping block is applied to the opening, the locking piece with the opening is driven to move, after the clamping block continuously descends and passes through the opening, the locking piece automatically returns to the original position to make the opening and the clamping block dislocated, the ascending movement of the lock rod is prevented, and the lock rod is locked.

Description

Technical Field

[0001] This invention relates to the field of trailer connector technology, specifically a quick-release trailer ball cover lock. Background Technology

[0002] As is well known, a trailer connector is a key component used to connect a trailer to a tractor. It is primarily made of high-strength metal materials, possessing excellent toughness and fatigue resistance, and can withstand significant tensile and impact forces. Its function is to achieve a secure connection between the trailer and the tractor, ensuring that they maintain a reliable connection throughout transportation.

[0003] Trailer ball cover is a type of trailer hitch connector. A trailer ball cover lock is a locking device used to secure the trailer ball cover. Existing trailer ball cover locks are as follows: Figure 1 As shown, the locking rod 3 and the connecting arm 1 are connected by a nut 17. The outer wall of the locking rod 3 is provided with a thread that matches the nut 17. The locking rod 3 is fixed by tightening the nut 17. During the locking and unlocking process of the locking rod 3, the nut 17 needs to be rotated several times to complete the operation. Moreover, a specific tool, such as a wrench, is required. The efficiency of locking and unlocking is low, and the whole process is time-consuming and laborious.

[0004] Another method on the market uses a lock cylinder and lock body to lock the lock rod, but this design still has obvious defects in actual operation. When installing the lock rod, the operator must first accurately insert the lock rod into the hole at the designated position, and then perform additional operations on the lock body (inserting and removing the key, turning the key to lock the lock body) in order to lock and fix the lock rod.

[0005] This design, which requires additional steps, significantly reduces operational efficiency. In environments that demand high-efficiency operations, its limitations become increasingly apparent, and new technological solutions are urgently needed to address these issues. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides a quick-install trailer ball cover lock, which solves the problems of excessive steps and complex operation when installing traditional lock bars.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the present invention provides the following technical solution: a quick-install trailer ball cover lock, which is mounted on a connecting arm on the vehicle body, and the connecting arm is provided with a connector;

[0010] The connecting arm is provided with a socket, and a locking rod is connected to the socket by plugging and unplugging.

[0011] The insertion portions on both sides of the locking rod penetrate the insertion hole along the axial direction of the insertion hole;

[0012] A locking block is installed on the insertion part of the locking rod;

[0013] The insertion hole is equipped with a locking component that can automatically return to its original position. The locking component has a through hole through which the insertion part of the locking rod passes, and the inner wall of the locking component has an opening for the card block to pass through.

[0014] When the insertion parts on both sides of the locking rod are aligned with the insertion holes and move downwards, the downward force of the locking block is applied to the opening, driving the locking member with the opening to move. After the locking rod continues to descend and the locking block passes through the opening, the locking member automatically returns to its original position, causing the opening and the locking block to misalign, preventing the locking rod from moving upwards and locking the locking rod.

[0015] (III) Beneficial Effects

[0016] Compared with the prior art, the present invention provides a quick-install trailer ball cover lock, which has the following advantages:

[0017] This quick-install trailer ball cover lock, through its automatically repositioning locking element, latch, and opening, allows the user to simply align the insertion part of the locking rod with the insertion hole and insert it downwards. The locking element then locks the rod as it descends. No additional steps or complex devices are required, greatly simplifying the operation process, significantly reducing operation time, and significantly improving work efficiency. For example, in trailer connection operations, the rapid locking allows workers to quickly complete equipment connection, avoiding the time wasted due to the cumbersome nature of traditional locking methods.

[0018] When using an external lock body, not only are additional keys required for operation and management, but searching for these keys in emergencies often wastes valuable time, impacts work progress, and may even lead to security issues. Nut-based locking requires manual, laborious tightening, a slow and cumbersome process. This invention eliminates the aforementioned complex connection steps, reducing the cost of purchasing and managing additional equipment, as well as potential economic losses due to cumbersome operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the existing technology that connects the locking rod via a nut;

[0020] Figure 2 This is a three-dimensional structural diagram of the present invention, showing the first embodiment of the protective structure.

[0021] Figure 3 This is a schematic diagram of the exploded structure of the present invention, showing the first embodiment of the protective structure installation;

[0022] Figure 4 For the present invention Figure 3 A partially enlarged structural diagram of point A shown in the image;

[0023] Figure 5 This is a schematic diagram of the exploded structure of the present invention, showing the first embodiment of the protective structure installation;

[0024] Figure 6 For the present invention Figure 5 A partially enlarged structural diagram of point B shown in the image;

[0025] Figure 7 This is a partial cross-sectional perspective view of the three-dimensional structure of the present invention;

[0026] Figure 8 For the present invention Figure 7 A partially enlarged structural diagram of point C shown in the image;

[0027] Figure 9 This is a three-dimensional structural diagram of the present invention, in which a top cover is installed;

[0028] Figure 10 This is a cross-sectional perspective view of the top cover portion of the present invention.

[0029] Figure 11 For the present invention Figure 10 A partially enlarged structural diagram of point D shown in the image;

[0030] Figure 12 This is a three-dimensional structural diagram of the present invention, in which the connector and the trailer arm are connected;

[0031] Figure 13 This is a three-dimensional structural diagram of the present invention, showing a second embodiment of the installation of the protective structure;

[0032] Figure 14 For the present invention Figure 13 A magnified structural diagram of point E shown in the figure;

[0033] Figure 15 This is a three-dimensional structural diagram of the present invention, in which the locking block is fixedly mounted on the locking rod;

[0034] Figure 16 For the present invention Figure 15 A magnified structural diagram of point F shown in the figure;

[0035] Figure 17 This is a cross-sectional structural diagram of the present invention, wherein the locking block is adjustablely mounted on the locking rod;

[0036] Figure 18 This is an exploded structural diagram of the present invention, wherein the locking block is adjustablely mounted on the locking rod;

[0037] Figure 19This is a three-dimensional structural diagram of the locking component of the present invention;

[0038] Figure 20 This is a cross-sectional view of the locking member of the present invention, wherein the opening is a ramp forming a plane;

[0039] Figure 21 This is a cross-sectional structural schematic diagram of the locking member of the present invention, wherein the force exerted by the block during its descent acts on the opening to drive the locking member to move;

[0040] Figure 22 This is a three-dimensional structural diagram of the top cover of the present invention.

[0041] In the diagram: 1. Connecting arm; 2. Connecting component; 3. Locking rod; 4. Insertion hole; 5. Locking block; 6. Bottom cover; 7. Locking component; 8. Elastic component; 9. Through hole; 10. Opening; 11. Pulling block; 12. Through groove; 13. Lead screw; 14. Cavity; 15. Groove; 16. Top cover; 17. Nut; 18. Center hole; 19. Trailer arm; 20. Flange body; 21. Limiting block; 22. Limiting groove; 23. End A; 24. End B; 25. Tightening block; 26. Protective component; 27. Connecting sleeve; 28. Mounting bracket; 29. ​​Lead screw; 30. Tightening component; 31. Stop block; 32. Convex ring body; 33. Hole; 34. Mounting component; 35. Lead screw; 36. Tightening component; 37. Hole; 38. Roller; 301. Insertion part; 302. Connecting part. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In existing technologies, such as Figure 1 As shown, the locking rod 3 and the connecting arm 1 are connected by a nut 17. The outer wall of the locking rod 3 is provided with threads that match the nut 17, and the locking rod is fixed by tightening the nut 17.

[0044] Please see Figure 2As shown, a quick-install trailer spherical cover lock of the present invention includes a connecting arm 1 installed on and connected to the vehicle body. The connecting arm 1 and the vehicle body are connected by a fixed method or a detachable method. The fixed connection between the connecting arm 1 and the vehicle body is usually achieved by welding or integral molding. The detachable connection between the connecting arm 1 and the vehicle body is usually achieved by bolts and nuts. A connector 2 is provided on the connecting arm 1. The connector 2 has a spherical structure, but any structure and shape of connector 2 can be used in the connector 2 of the present invention. Figure 12 As shown, a matching trailer arm 19 is installed on the connector 2. The trailer arm 19 is installed on another vehicle body (trailer, front vehicle, tractor, etc.). The connection method between the trailer arm 19 and the vehicle body can refer to the connection method between the connecting arm 1 and the vehicle body described above. After the trailer arm 19 and the connector 2 are connected, the connection between the front and rear vehicles is realized.

[0045] like Figure 12 As shown, both the connecting arm 1 and the trailer arm 19 are made of high-strength materials, such as steel alloy and aluminum alloy, possessing good strength and tensile strength. The connecting arm 1 and the trailer arm 19 are connected by a connector 2 fixedly mounted on the connecting arm 1. The trailer arm 19 mounted on the connector 2 is limited by a locking rod 3 mounted on the connecting arm 1 in detail below. The locking rod 3 surrounds the outside of the trailer arm 19, and gaps are reserved on both sides of the locking rod 3 and the sides of the trailer arm 19 to allow the trailer arm 19 to rotate flexibly. That is, the width of the locking rod 3 is sufficient to allow the connecting arm 1 to rotate to both sides normally when the trailer arm 19 and the connector 2 are connected. The locking rod 3 will not obstruct the normal rotation of the connecting arm 1. In other words, the present invention does not impose any limitation on the width of the locking rod 3, and it can be arbitrarily set according to actual usage requirements. However, the distance between the top of the locking rod 3 and the top of the trailer arm 19 is less than the height of the connector 2, and the locking rod 3 prevents the trailer arm 19 and the connector 2 from detaching.

[0046] like Figure 3 , 5 As shown in Figures 7 and 9, a locking rod 3 is installed on the connecting arm 1. The locking rod 3 has an insertion part 301 on both sides and a connecting part 302 integrally formed for connecting the insertion part 301. The insertion parts 301 on both sides of the locking rod 3 are vertically arranged, and the connecting part 302 of the locking rod 3 is curved. However, the connecting part 302 is not limited to being curved and can also be horizontal, etc. Insertion holes 4 are opened on both sides of the connecting arm 1 for the insertion part 301 to pass through. The locking rod 3 and the insertion hole 4 are connected by insertion and removal. The inner diameter of the insertion hole 4 is slightly larger than the diameter of the insertion part 301, so that the insertion part 301 on the locking rod 3 can move up and down along the axial direction of the insertion hole 4.

[0047] like Figure 19-21As shown, a locking block 5 is installed on the insertion part 301 of the locking rod 3, and a cylindrical locking member 7 is installed in the insertion hole 4. A through hole 9 is opened in the middle of the locking member 7 for the insertion part 301 of the locking rod 3 to pass through. An opening 10 is opened on the inner wall of the locking member 7 for the locking block 5 to pass through. The minimum width L1 of the opening 10 is greater than the maximum width L2 of the locking block 5. When it is necessary to lock the locking rod 3, the insertion parts 301 on both sides of the locking rod 3 are aligned with the corresponding insertion holes 4 and move downward. The locking block 5 begins to descend under the action of external force. This force is precisely applied to the opening 10 of the locking member 7. Driven by this force, the locking member 7 with the opening 10 rotates relative to the inner wall of the insertion hole 4. During the rotation of the locking member 7, the elastic member 8 connected to the locking member 7 is twisted and deformed due to the rotation of the locking member 7. The elastic member 8 stores elastic potential energy. At the same time, the locking rod 3 continues to descend until the locking block 5 passes smoothly through the opening 10 of the locking member 7. At this time, the elastic member 8 releases torque due to the previously stored elastic potential energy, driving the locking member 7 to quickly return to the initial position. The locking member 7 automatically returns to the initial position under the action of the elastic member 8. The bottom of the opening 10 and the top of the locking block 5 form a misaligned state. The misaligned locking block 5 and the opening 10 will restrain each other, thereby firmly locking the locking rod 3 to prevent the locking rod 3 from moving upward.

[0048] like Figure 4 , 6 As shown in Figures 8, 15, 16, and 19, the elastic element 8 in this invention provides power during the rotation of the locking element 7. The term "elastic element 8" is a general term; in practical applications, various types can be selected, including common torsion springs and clockwork mechanisms. One end of the elastic element 8 is securely connected to the locking element 7. The connection method can be welding, riveting, or using specific slots or connecting parts 2, depending on the type of elastic element 8 and the structural characteristics of the locking element 7, to ensure a reliable connection and prevent detachment or loosening during device operation. The other end of the elastic element 8 is fixedly connected to the connecting arm 1. The fixing method is also selected based on the actual situation, such as bolt tightening or welding, to ensure a stable connection between the elastic element 8 and the connecting arm 1. When the locking element 7 rotates or displaces due to external forces, the elastic element 8 undergoes corresponding elastic deformation and stores energy. When the external force disappears (the locking block 5 passes through the opening 10), the elastic element 8 drives the locking element 7 to reset by the stored elastic potential energy, thereby automatically restoring the locking element 7 to its initial position.

[0049] like Figure 19-21As shown, to allow the locking block 5 to pass smoothly through the opening 10, the top surface of the opening 10 is designed as a ramp. The ramp converts the force of the locking block 5's linear up-and-down movement into a force that provides rotation for the locking member 7. The ramp can be a planar ramp or a curved ramp. To make the rotation of the locking member 7 smoother and to make it easier for the operator to drive the locking lever 3 downwards, the bottom surface of the locking block 5 can also be designed as a ramp. The ramp at the top of the opening 10 and the ramp at the bottom of the locking block 5 are matched. In the following description, for ease of description, the example is taken as when the insertion part 301 of the locking lever 3 descends, the force of the locking block 5 acts on the opening 10, causing the locking member 7 to rotate clockwise. Those skilled in the art will understand that by changing the direction of the ramp, it can also be set so that when the insertion part 301 of the locking lever 3 descends, the force of the locking block 5 acts on the opening 10, causing the locking member 7 to rotate counterclockwise.

[0050] like Figure 4 , 6 As shown in Figures 8, 15, 16, and 19, a flange 20 is fixedly installed on the inner wall of the insertion hole 4. The flange 20 is located at the upper and lower parts of the locking member 7, respectively, and the flange 20 plays a limiting role. The upper flange 20 restricts the upward displacement of the locking member 7, while the lower flange 20 restricts the downward movement of the locking member 7, ensuring that the locking member 7 is always within the predetermined working range inside the insertion hole 4, allowing the locking member 7 to rotate smoothly within this working range. The locking member 7 will not move up and down during rotation, ensuring the stability and reliability of the movement.

[0051] In addition to the flange 20 described above limiting the locking member 7, a mounting groove specifically for the locking member 7 to rotate can also be provided in the insertion hole 4. The shape of this mounting groove is adapted to the locking member 7, allowing the locking member 7 to rotate smoothly within it and limiting the up-and-down movement of the locking member 7.

[0052] Furthermore, the movement of the locking member 7 in this invention is not limited to rotation; the locking member 7 can also be slidably connected to the connecting arm 1. When a slidable connection is selected, a groove for the locking member 7 to slide is provided in the connecting arm 1, and the locking member 7 is a long strip with a certain thickness. An opening 10 is provided on the locking member 7, and the thickness of the locking member 7 is sufficient to meet the height of the opening 10. An elastic member 8, such as a spring, provides the power for the locking member 7 to reset. In actual operation, when the locking member 7 undergoes sliding displacement due to the force of the locking block 5, the spring will undergo elastic deformation and store energy. Once the external force is released, the spring, relying on the stored elastic potential energy, drives the locking member 7 to quickly slide and reset, returning to the initial position and locking the locking block 5.

[0053] In the locking process of the locking rod 3, the locking rod 3 of the present invention greatly simplifies the locking process, improves convenience, and makes operation simpler. When it is necessary to lock the locking rod 3, the user only needs to align the insertion part 301 of the locking rod 3 with the insertion hole 4 and insert it downwards. As the locking rod 3 continues to descend, the locking member 7 locks the locking rod 3. The entire locking process is completed smoothly during the downward insertion of the locking rod 3. In this entire locking process, no additional operation steps are required, nor is it necessary to rely on other complex devices. Compared with traditional locking devices, its limitations are very obvious. Traditional methods often rely on an external lock body or a nut 17 structure to lock the locking rod 3. When using an external lock body, not only is it necessary to carry and manage the key, but finding the key in an emergency can easily cause delays. As for locking with a nut 17 structure, it requires manual and laborious turning, which is slow and cumbersome.

[0054] However, this invention completely eliminates these complex methods. Users simply need to insert the locking lever 3 downwards, and the various components will cleverly cooperate, quickly and accurately locking the lever 3 during the smooth insertion motion. This design greatly simplifies the operation process and reduces operation time.

[0055] like Figure 3-4 As shown, to further enable the locking member 7 to unlock the locking rod 3, ensuring that the insertion part 301 of the locking rod 3 can be smoothly pulled out from the insertion hole 4, and that the opening 10 of the locking member 7 can be smoothly aligned with the locking block 5, the present invention provides a lever 11 firmly fixed on the outer wall of the locking member 7. This lever 11 is integral with the locking member 7 and can transmit externally applied driving force. A through groove 12 adapted to the lever 11 is provided on the side wall of the connecting arm 1. The through groove 12 provides a through channel for the lever 11, allowing it to pass through the through groove 12, which has sufficient space for movement. When unlocking is required, the operator can use a tool or manually move the lever 11, driving it to move within the space defined by the through groove 12. As the lever 11 moves, the locking member 7 also moves accordingly. During this process, the position of the opening 10 of the locking member 7 moves until the bottom of the opening 10 is completely aligned with the top of the locking block 5. At this point, the insertion part 301 of the locking lever 3 can be pulled out smoothly, completing the unlocking operation of the locking lever 3.

[0056] To further precisely control the rotation angle of the locking element 7, a limiting block 21 is fixedly installed on the flange body 20. A corresponding limiting groove 22 is provided on the locking element 7. The limiting block 21 and the limiting groove 22 cooperate with each other to limit the rotation angle of the locking element 7.

[0057] like Figure 6As shown, when the limiting block 21 abuts against one end of the limiting groove 22 (end A 23 of the limiting groove 22), the position of the locking member 7 is such that the top of the opening 10 and the bottom of the insertable block 5 are exactly in the insertion position, which is also the position where the top of the block 5 and the bottom of the opening 10 are misaligned after the block 5 passes through the opening 10.

[0058] When unlocking is required, the locking member 7 is rotated by operating the lever 11. As the locking member 7 rotates, when the limiting block 21 abuts against the other end of the limiting groove 22 (end B 24 of the limiting groove 22), the locking member 7 can no longer rotate, and the bottom of the opening 10 of the locking member 7 is precisely aligned with the top of the locking block 5. At this time, the locking block 5 can be pulled upwards without obstruction, easily unlocking the locking lever 3.

[0059] By using the limit block 21 and the limit groove 22 to limit the rotation angle of the locking component 7, the accuracy and stability of the locking and unlocking processes are improved, and users do not need to worry about operational errors caused by excessive or insufficient rotation of the locking component 7.

[0060] like Figure 2-3 As shown, a hollow bottom cover 6 is provided on the connecting arm 1 at the insertion hole 4 where the locking element 7 is installed. The bottom cover 6 is set downward, and the insertion part 301 of the locking rod 3 can pass through the bottom cover 6, ensuring that the locking rod 3 can move freely up and down during normal operation. However, the locking block 5 on the locking rod 3 cannot pass through the bottom cover 6. When the locking rod 3 moves downward, as the locking rod 3 continues to descend, once the locking block 5 reaches the position of the bottom cover 6, the bottom cover 6 limits the locking block 5. Since the locking block 5 cannot pass through the bottom cover 6, the downward movement of the locking rod 3 is thus prevented by the bottom cover 6, thereby achieving precise limitation of the downward position of the locking rod 3.

[0061] Similarly, as Figure 10-11 As shown in Figure 22, a hollow top cover 16 is provided on the connecting arm 1 at the insertion hole 4 where the locking element 7 is installed. The top cover 16 is set upward and has a central hole 18. The size of the central hole 18 is designed to allow the locking rod 3 to pass through smoothly and rotate. That is, the inner diameter of the central hole 18 is slightly larger than the diameter of the locking rod 3. However, the size of the central hole 18 is still not large enough to allow the locking block 5 on the locking rod 3 to pass through, so as to accurately limit the upward position of the locking rod 3.

[0062] At the same time, such as Figure 15 As shown, the insertion portion 301 of the locking lever 3 on the side with the locking member 7 is longer, while the insertion portion 301 on the other side is shorter. This design, in conjunction with the top cover 16, greatly facilitates actual operation.

[0063] When it is necessary to remove the locking rod 3, the top cover 16 will limit the locking block 5 due to its presence. This limiting function allows the entire locking rod 3 to be removed without disassembling it. The operator only needs to pull the locking rod 3 upward along the center hole 18 and then rotate it. In this way, the locking rod 3 can be rotated flexibly without disassembling it, facilitating the installation of the trailer arm 19 and the connector 2. After the installation of the trailer arm 19 and the connector 2 is completed, the locking rod 3 is rotated back to its initial position so that it is realigned with the insertion hole 4, thus restoring the normal insertion and removal function of the locking rod 3.

[0064] The top cover 16 plays a crucial role in preventing loss. It connects the locking rod 3 and the connecting arm 1 into a single structure, avoiding the risk of loss due to disassembly of the locking rod 3. This not only improves the convenience of component management but also ensures the integrity of the device during long-term use.

[0065] like Figure 10-11 As shown, a stop 31 is also fixedly installed inside the top cover 16. When it is necessary to open the locking lever 3, the locking lever 3 is rotated around the central hole 18 of the top cover 16. During this process, the shorter insertion part 301 on the other side of the locking lever 3 will smoothly disengage from the corresponding insertion hole 4. At this time, the locking lever 3 can rotate normally, realizing the opening action of the locking lever 3. When it is necessary to close the locking lever 3 after the opening operation is completed, the locking lever 3 is rotated back to the initial position. At this time, the stop 31 plays a key role. Due to the setting of the stop 31, it can accurately limit the locking block 5. Under the blocking and limiting action of the stop 31, the shorter insertion part 301 on the other side of the locking lever 3 can be accurately positioned with the insertion hole 4, ensuring that the insertion part 301 and the insertion hole 4 are precisely aligned, so that the insertion part 301 can be smoothly and accurately inserted into the insertion hole 4, completing the closing action of the locking lever 3 and ensuring the accuracy of the closing of the locking lever 3.

[0066] The present invention provides two embodiments of the connection method of the insertion part 301 of the locking block 5 and the locking rod 3. In the first embodiment, the position of the locking block 5 on the insertion part 301 is adjustable; in the second embodiment, the locking block 5 and the insertion part 301 are fixedly connected, and the position of the locking block 5 on the insertion part 301 is not adjustable.

[0067] like Figure 17-18The diagram shows a first embodiment of the connection between the locking block 5 and the insertion part 301. In this first embodiment, the position of the locking block 5 at the insertion part 301 is adjustable. A cavity 14 for mounting the lead screw 13 is formed within the insertion part 301 of the locking rod 3. The lead screw 13 and the locking rod 3 are connected by a rotatable connection, ensuring that the lead screw 13 can rotate flexibly within the locking rod 3. The locking block 5 and the lead screw 13 are connected by a thread. A slot 15 is formed on the side wall of the insertion part 301 of the locking rod 3. This slot 15 penetrates the side wall of the locking rod 3 and has a specific length. The slot 15 defines the movement trajectory of the locking block 5, allowing it to slide stably along the length direction of the slot 15 within the slot 15. When adjustment of the locking rod 3 is required, the user rotates the lead screw 13. Due to the threaded connection between the lead screw 13 and the locking block 5, the rotation of the lead screw 13 is converted into linear movement of the locking block 5 along the length direction of the slot 15. By controlling the rotation direction and number of turns of the lead screw 13, the position of the locking block 5 within the slot 15 can be precisely adjusted.

[0068] The bottom end of the lead screw 13 is equipped with a turning block 25 for rotating the lead screw 13. Operators can flexibly choose the adjustment method according to actual needs and operating habits. When operating space is limited and adjustment precision requirements are not particularly high, the turning block 25 can be rotated manually. By holding the turning block 25 and applying force, it can be rotated clockwise or counterclockwise, thereby driving the lead screw 13 to rotate synchronously. Because the lead screw 13 and the locking block 5 are connected by threads, the rotation of the lead screw 13 is converted into the up-and-down movement of the locking block 5 along the groove 15 of the locking rod 3, thus achieving adjustment of the height of the locking block 5.

[0069] If the adjustment resistance is high, or if more precise fine-tuning is required, the operator can also use tools to assist in the operation. For example, by using a wrench or other tools that are compatible with the screw block 25, the lever action of the tool can easily turn the lead screw 13 with less force, achieving a more precise adjustment of the height of the locking block 5.

[0070] Since the insertion part 301 of the locking rod 3 can pass through the bottom cover 6, the lead screw 13 can also pass through the bottom cover 6, and the lead screw 13 can extend downwards by a certain length. The significance of this design is that even after the locking rod 3 is locked by the locking member 7, while the bottom cover 6 limits the locking rod 3, it does not hinder the adjustment operation of the lead screw 13. The lead screw 13 can be directly rotated and adjusted from below the bottom cover 6.

[0071] The forces acting on the locking block 5 and the lead screw 13 are further described in detail. When the lead screw 13 rotates, its rotational motion generates a circumferential driving force. The helical structure of the thread is like an inclined plane wrapped around a cylinder. According to the principle of screw drive, when the lead screw 13 rotates, the circumferential force on the thread surface can be decomposed into axial force and radial force. The radial force keeps the lead screw 13 at a stable center of rotation within the cavity 14 of the locking rod 3, while the axial force is the key to driving the movement of the locking block 5. Because the locking block 5 is threadedly engaged with the lead screw 13, this axial force acts on the thread surface of the locking block 5, and its direction is along the axial direction of the lead screw 13. The locking block 5 cannot follow the lead screw 13 in circumferential motion; it can only convert the axial force transmitted by the lead screw 13 into linear motion along the length of the slot 15 under the constraint of the slot 15 on the side wall of the locking rod 3. By controlling the rotation direction of the lead screw 13, the movement direction of the locking block 5 can be precisely controlled. For example, rotating the lead screw 13 clockwise will cause the locking block 5 to move axially in a specific (upward) direction; rotating it counterclockwise will cause the locking block 5 to move in the opposite direction. The reverse is also possible. Furthermore, the number of rotations of the lead screw 13 directly determines the distance the locking block 5 moves. For example, for every rotation of the lead screw 13, the locking block 5 will move a corresponding distance according to the thread pitch. If the thread pitch is 5 mm, two rotations of the lead screw 13 will cause the locking block 5 to move 10 mm within the slot 15.

[0072] Therefore, this force conversion advantage is fully demonstrated when installing different models of trailer arms 19 in actual use, especially when trailer arms 19 have different heights. The position of the locking block 5 can be adjusted by rotating the lead screw 13, thereby changing the reserved height above and below the locking rod 3. This reserved height is infinitely (linearly) adjusted through the cooperation of the lead screw 13 and the locking block 5. For example, for a taller trailer arm 19, the locking block 5 can be adjusted upward to increase the reserved length above the locking rod 3; for a shorter trailer arm 19, the locking block 5 can be adjusted downward to provide a suitable reserved height below the locking rod 3. In this way, this device can adapt to trailer arms 19 of various heights, improving its adaptability to different trailer arms 19 and enhancing its practicality.

[0073] like Figure 15-16The diagram shows a second embodiment of the connection between the locking block 5 and the insertion part 301. In this second embodiment, the locking block 5 and the insertion part 301 are fixedly connected, typically by welding or integral casting, ensuring a stable integration of the locking block 5 and the insertion part 301 of the locking rod 3 into a single unit. This provides a stable and limited effect on the locking position of the locking member 7 acting on the locking block 5. When the locking member 7 performs the locking action, the locked position of the locking block 5 remains unchanged, preventing any alteration of the reserved space on the insertion part 301 under this fixed connection method. This feature is particularly advantageous when adapting to a specific trailer arm 19, such as connecting trailer arms 19 of the same model. The elimination of the need for complex adjustment structures greatly simplifies the overall product structure. The reduced number of parts simplifies the manufacturing process, directly lowering the purchase cost.

[0074] like Figure 10-11 As shown in Figure 22, in the first embodiment where the locking block 5 and the insertion part 301 are connected, since the position of the locking block 5 is adjustable, the height of the top cover 16 is set relatively high to ensure that the locking block 5 can move freely during adjustment without being restricted by the top cover 16. This creates a large hollow space inside the top cover 16. This large space provides ample range for the up-and-down movement of the locking block 5. No matter how the locking block 5 is positioned on the locking rod 3, it can move freely inside the top cover 16 without being obstructed by insufficient space in the top cover 16, thus ensuring the adjustment function of the locking block 5.

[0075] In the second embodiment, where the locking block 5 and the insertion part 301 are connected, the locking block 5 and the insertion part 301 of the locking rod 3 are fixedly connected. In this case, the locking block 5 does not need to be positioned on the insertion part 301 of the locking rod 3, and its movement pattern and range are relatively fixed. Therefore, the top cover 16 does not need to be set too high. The lower top cover 16 design, with its hollow interior space, is sufficient to meet the movement requirements of the locking block 5. This not only effectively reduces material costs but also makes the overall structure of the product more compact, improving the product's aesthetics and space utilization while ensuring functionality.

[0076] This invention provides embodiments of two protective structures for protecting the connector 2. Each protective structure includes a protective element 26 mounted on the connecting arm 1. During the actual connection process between the trailer arm 19 and the connector 2, due to complex operating environments and worker negligence, the trailer arm 19 may directly impact or scrape against the connector 2. This impact or scraping will cause severe damage to the smooth surface of the connector 2, significantly reducing its original smoothness. During subsequent towing, this will exacerbate frictional wear between the two connecting components (trailer arm 19 and connector 2). Over time, the service life of the connector 2 and the trailer arm 19 will be severely shortened, and frequent maintenance and replacement will increase subsequent operating costs.

[0077] Before the trailer arm 19 approaches the connector 2 for connection, the protective component 26 is pre-intervened to form a stable protective barrier between the connector 2 and the trailer arm 19. In the event of an accidental impact or scrape to the trailer arm 19, the protective component 26 can absorb the impact force first, preventing direct rigid contact between the trailer arm 19 and the connector 2, thereby effectively protecting the connector 2 from damage.

[0078] The protective component 26 can be moved according to usage requirements. When protection of the connecting member 2 is needed, the protective component 26 can be moved to a designated protective position. In this position, the protective component 26 can completely block the trailer arm 19 from approaching the connecting member 2. In the event of an accidental impact by the trailer arm 19, the protective component 26 will first absorb the impact force, preventing damage to the connecting member 2, thus effectively protecting the connecting member 2. When the connecting member 2 and the trailer arm 19 need to be connected normally and the protective component 26 is no longer needed, simply remove the protective component 26 from its protective position and move it to another position that does not obstruct the connection between the connecting arm 1 and the connecting member 2.

[0079] like Figure 2-12 The diagram shows a first embodiment of the protective structure of the present invention. In this first embodiment, the protective member 26 is driven to move up or down, thereby switching between a protective and non-protective state for the connecting member 2. A connecting sleeve 27 is provided on the side wall of the connecting arm 1, through which the protective member 26 passes. The inner wall of the connecting sleeve 27 provides guidance for the vertical displacement of the protective member 26, allowing it to move up and down along the inner wall of the connecting sleeve 27. This ensures that the protective member 26 maintains a stable trajectory during movement, preventing deviation or swaying, and simultaneously improving the stability and impact resistance of the protective member 26.

[0080] A stable mounting bracket 28 is installed at the bottom of the connecting arm 1. A vertically mounted lead screw 29 is rotatably connected to the mounting bracket 28, and the lead screw 29 is rotatably connected via precision bearings. The lead screw 29 and the protective component 26 are connected by a thread. When the lead screw 29 rotates, its threaded rotational motion can be precisely converted into the linear up-and-down motion of the protective component 26. The lifting and lowering motion of the protective component 26 is driven by the threaded transmission, and its working principle can be found above in the principle of using the lead screw 13 to drive the movement of the locking block 5.

[0081] Protection State Switching: When protection of connector 2 is required, the screw 29 can be turned manually using a tool (such as a wrench). Due to the threaded connection between the screw 29 and the protective component 26, the forward rotation of the screw 29 will cause the protective component 26 to move upward along the inner wall of the connecting sleeve 27. When the protective component 26 rises to the designated position, a reliable protective barrier can be formed between the trailer arm 19 and connector 2, effectively preventing accidental impacts that the trailer arm 19 may cause to connector 2 during the connection process.

[0082] Switching to non-protected state: When connector 2 and trailer arm 19 need to be connected normally without the intervention of protective component 26, rotate screw 29 in the reverse direction. Under the action of screw 29, protective component 26 will move downward along connecting sleeve 27 until it completely disengages from the connection path of connector 2, reaching a non-protected position that does not hinder the connection between connecting arm 1 and connector 2.

[0083] A convex ring 32 is provided on the outer wall of the lead screw 29. The convex ring 32 and the lead screw 29 are integrally formed, possessing high strength and stability. The main function of the convex ring 32 is to cooperate with the connection position on the mounting bracket 28 to form an effective limiting structure, preventing the lead screw 29 from moving downward on the mounting bracket 28. When the lead screw 29 is subjected to external force and undergoes axial displacement, the convex ring 32 will make tight contact with the mounting bracket 28, thereby preventing the lead screw 29 from moving downward and ensuring that the lead screw 29 is always in a stable working position, thus ensuring the accuracy and stability of the protective component 26 during the lifting process.

[0084] A screw-operated component 30 is fixedly connected to the end of the lead screw 29. This component 30 is a regular polygonal structure with a diameter larger than that of the lead screw 29 to facilitate rotation of the lead screw 29 by the operator. The connection between the screw-operated component 30 and the lead screw 29 is achieved through high-strength welding or threaded fastening, ensuring that the lead screw 29 does not shift upwards. A hole 33 is provided on the screw-operated component 30, the diameter of which is compatible with common insert rod sizes. When rotation of the lead screw 29 is required, the insert rod can be inserted into the hole 33 of the screw-operated component 30. Rotating the insert rod causes the screw-operated component 30 and the lead screw 29 to rotate together, making operation more convenient and increasing torque transmission efficiency, allowing the operator to control the rotation of the lead screw 29 more easily and precisely.

[0085] Besides the method described above, where the protective component 26 is driven to move linearly up and down along the inner wall of the connecting sleeve 27 via the lead screw 29 to protect the connecting component 2, other methods can also be used to move the protective component 26 up and down within the connecting sleeve 27. Once the protective component 26 has reached its designated position, its position can be fixed. For example, the protective component 26 and the connecting sleeve 27 can be slidably connected, allowing the protective component 26 to move up and down along the inner wall of the connecting sleeve 27 directly by manual drive. A set screw is threaded onto the connecting sleeve 27. The screw-in end of the set screw abuts against the outer wall of the protective component 26. Tightening the set screw fixes the position of the protective component 26. A positioning hole for inserting the set screw can be provided on the outer wall of the protective component 26. Inserting the set screw into the positioning hole significantly improves its stability. After the set screw is unscrewed, the protective component 26 can continue to move up and down.

[0086] like Figure 13-14 The diagram shows a second embodiment of the protective structure of the present invention. In this second embodiment, the protective member 26 is driven to move left and right, thereby switching between the protective and non-protective states of the connecting member 2. Mounting members 34 are provided on both sides of the connecting arm 1, and a horizontally mounted lead screw 35 is rotatably mounted on the mounting member 34. The lead screw 35 is rotatably connected via precision bearings. The lead screw 35 and the protective member 26 are connected by a threaded connection. When the lead screw 35 rotates, its threaded rotational motion is precisely converted into the left and right movement of the protective member 35. The left and right movement of the protective member 26 is driven by a threaded transmission; its working principle is the same as that described above, which uses the lead screw 13 to drive the movement of the locking block 5.

[0087] The protective component 26 and the connecting arm 1 abut against each other on their sidewalls. The protective component 26 can be translated horizontally along the connecting arm 1, ensuring that the protective component 26 maintains a stable trajectory during movement without deviation or swaying, thus improving the stability and impact resistance of the protective component 26. Alternatively, a sliding groove for horizontal movement of the protective component 26 can be provided on the connecting arm 1, or an outwardly protruding guide rail can be provided on the connecting arm 1, with a guide groove on the protective component 26 matching the guide rail, allowing the guide groove on the protective component 26 to slide along the guide rail.

[0088] Protection State Switching: When protection of connector 2 is required, the screw 35 is turned manually using a tool (such as a wrench). Due to the threaded connection between screw 35 and protective component 26, forward rotation of screw 35 will cause protective component 26 to move horizontally along the outer wall of connecting arm 1. When protective component 26 moves to the designated position, a reliable protective barrier is formed between trailer arm 19 and connector 2, effectively preventing accidental impacts that trailer arm 19 may cause to connector 2 during the connection process.

[0089] Switching to non-protected state: When the connector 2 and trailer arm 19 need to be connected normally without the intervention of the protective component 26, rotate the screw 35 in the opposite direction. Driven by the screw 35, the protective component 26 will move to the side along the outer wall of the connector arm 1 until it completely disengages from the connection path of the connector 2, reaching a non-protected position that does not hinder the connection between the connector arm 1 and the connector 2. The position of the protective component 26 moving to both sides ensures that the protective component 26 does not obstruct the rotation of the trailer arm 19.

[0090] To reduce friction between the protective component 26 and the trailer arm 19 during horizontal movement and prevent wear, a rotatable roller 38 is provided on the top of the protective component 26. When the protective component 26 moves horizontally, the roller 38 directly contacts the surface of the trailer arm 19. Compared to the traditional sliding friction between the protective component 26 and the trailer arm 19, the rolling friction of the roller 38 significantly reduces the frictional force between them. Because the roller 38 can roll freely, as the protective component 26 moves, the roller 38 rolls on the surface of the trailer arm 19, converting the original sliding friction into rolling friction. This conversion effectively reduces the magnitude of friction, thereby preventing unnecessary wear on the trailer arm 19 during movement and extending the service life of the trailer arm 19.

[0091] Because the protective component 26 is equipped with a rotatable roller 38, in order to improve the stability of the top of the protective component 26 supporting the trailer arm 19, there are two protective components 26, and the lead screw 35 is a two-way lead screw with opposite threads on both sides. The threads on both sides of the protective component 26 and the lead screw 35 are connected by threads. When the lead screw 35 is rotated, the protective components 26 on both sides can be driven to move closer or further away from each other at the same time. Because there are two protective components 26, the stability of the protective components 26 supporting the trailer arm 19 on its top is significantly improved. When the trailer arm 19 and the connecting piece 2 are aligned vertically, the protective components 26 are driven to move to both sides by rotating the lead screw 35. When the trailer arm 19 falls, it falls directly onto the connecting piece 2 to achieve connection. Moreover, the width of the protective components 26 on both sides will not hinder the rotation angle of the trailer arm 19 during normal towing.

[0092] Both ends of the lead screw 35 are fixedly connected to a screw-operated component 36. This component 36 is a regular polygonal structure with a diameter larger than that of the lead screw 35, facilitating the operator's application of force to rotate the lead screw 35. The connection between the screw-operated component 36 and the lead screw 35 is achieved through high-strength welding or threaded fastening, ensuring that the lead screw 35 does not shift laterally. A hole 37 is provided on the screw-operated component 36, the diameter of which is compatible with common insert rod sizes. When rotation of the lead screw 35 is required, the insert rod can be inserted into the hole 37 of the screw-operated component 36. Rotating the insert rod causes the screw-operated component 36 and the lead screw 35 to rotate together, making operation more convenient and increasing torque transmission efficiency, allowing the operator to more easily and precisely control the rotation of the lead screw 35.

[0093] Besides the aforementioned method of driving the protective component 26 to move left and right along the outer wall of the connecting arm 1 via the lead screw 35 to protect the connecting component 2, other methods can also be used to move the protective component 26 left and right. Once the protective component 26 is in position, its position can be fixed. For example, a sliding rod can be installed on the mounting component 34, and the protective component 26 and the sliding rod can be slidably connected. The protective component 26 can be manually driven to move horizontally along the length of the sliding rod. A set screw is threaded onto the protective component 26. The screw-in end of the set screw abuts against the outer wall of the sliding rod. When the set screw is tightened, it abuts against the outer wall of the sliding rod, fixing the position of the protective component 26. A positioning hole can be provided on the outer wall of the sliding rod for inserting the set screw. Inserting the set screw into the positioning hole significantly improves its stability. After the set screw is unscrewed, the protective component 26 can continue to move left and right.

[0094] To further enhance the anti-theft function of the lock rod 3, a keyhole is provided on the lever 11, and a metal lock lug, shaped like a "U," is fixedly installed on the connecting arm 1, or a through hole is provided on the block. The lock lug and the keyhole on the lever 11 work together, allowing the user to use common locks such as padlocks. By passing the lock body through the keyhole and lock lug of the lever 11, the anti-theft function is achieved.

[0095] Users can choose to lock the device for security purposes; if frequent locking is not required, the lock can be left unused. The lock should only be used when necessary.

[0096] Non-anti-theft mode (suitable for secure areas): In secure environments such as parks, factories, or private yards where frequent locking is not required, no lock body is needed. In this mode, the lever 11 can move freely, facilitating the disassembly and installation of the lock rod 3. This unlocked mode significantly improves work efficiency when frequently changing connected vehicle bodies, reducing the time wasted on repeated unlocking and locking using traditional built-in lock bodies.

[0097] Anti-theft mode (suitable for unfamiliar environments): When towing a vehicle to an unfamiliar environment (when going out), it is necessary to lock it for safety reasons. Insert the lock bar 3 into the socket 4, and then use the prepared lock body to pass the lock beam part of the lock body through the lock hole and lock nose on the lever 11 in sequence to lock the lock body and complete the locking of the equipment, which can play the role of anti-theft.

[0098] In summary, when using this quick-install trailer ball cover lock, to ensure a safe and reliable connection between the trailer arm 19 and the connector 2 during trailer connection operations, please strictly follow the following usage steps:

[0099] Protection Preparation: Before connecting the trailer arm 19 and the connector 2, move the protective component 26 to a position that effectively protects the connector 2, depending on the driving method used. If using lead screws 29 and 35, rotate the lead screws 29 and 35 using a tool or by hand to move the protective component 26 to the predetermined protective position. If using manual drive, hold the protective component 26 directly by hand and move it to the designated position in the specified direction, then tighten the set screw to secure the protective component 26. At this time, the protective component 26 will form a protective barrier for the connector 2, preventing damage to the connector 2 from any subsequent hard contact between the trailer arm 19 and the connector 2.

[0100] Unlocking operation: Open the locking rod 3, pull the locking rod 3 completely out of the socket 4, or pull out the shorter insertion part 301 on one side of the locking rod 3, and then rotate the locking rod 3 as a whole. This prepares for the installation of the trailer arm 19.

[0101] After the trailer arm 19 is in place, move it to a suitable position (so that it can smoothly align with the connector 2). During this process, carefully observe the relative positions of the trailer arm 19, the protective member 26, and the connector 2 to avoid collisions. Even if a collision occurs, the protective member 26 will prevent the trailer arm 19 and the connector 2 from colliding. Once the trailer arm 19 reaches the suitable position, release the locking mechanism of the protective member 26. If driven by lead screws 29 and 35, rotate them in the opposite direction to move the protective member 26 away. If manually driven, loosen the set screw and manually move the protective member 26 away, ensuring it does not obstruct the connection between the trailer arm 19 and the connector 2.

[0102] Connection operation: Connect the trailer arm 19 to the connector 2 to ensure accurate docking.

[0103] Locking limit: After the trailer arm 19 is connected to the connector 2, when it is necessary to lock the locking rod 3, when the insertion parts 301 on both sides of the locking rod 3 are aligned with the insertion holes 4 and move downward, the locking block 5 begins to descend under the action of external force. This force is precisely applied to the opening 10 of the locking member 7. Driven by this force, the locking member 7 with the opening 10 moves relative to the inner wall of the insertion hole 4. During the movement of the locking member 7, the elastic member 8 connected to the locking member 7 deforms due to the movement of the locking member 7. The elastic member 8 stores elastic potential energy. At the same time, the locking rod 3 continues to descend until the locking block 5 passes smoothly through the opening 10 of the locking member 7. At this time, the elastic potential energy stored in the elastic member 8 is released, driving the locking member 7 to quickly return to the initial position. The locking member 7 automatically returns to the initial position under the action of the elastic member 8. The bottom of the opening 10 and the top of the locking block 5 form a misaligned state. The misaligned locking block 5 and the opening 10 will restrain each other, thereby firmly locking the locking rod 3 to prevent the locking rod 3 from moving upward. At this time, the locking rod 3 limits the upward movement of the trailer arm 19, effectively preventing the trailer arm 19 from separating from the connecting member 2, thereby achieving a safe and stable connection.

[0104] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quick-install trailer ball cover lock, comprising a connecting arm (1), the connecting arm (1) being mounted on the vehicle body, and a connector (2) being provided on the connecting arm (1), and a socket (4) being provided on the connecting arm (1); Includes a locking rod (3), the locking rod (3) includes an insertion part (301) provided on both sides, the locking rod (3) is connected to the insertion hole (4) by a plugging and unplugging method, and the insertion parts (301) on both sides of the locking rod (3) penetrate the insertion hole (4) along the axial direction of the insertion hole (4); Its features are: A locking block (5) is installed on the insertion part (301) of the locking rod (3); Includes a locking member (7), which can automatically return to its original position. The locking member (7) is installed in the insertion hole (4). The locking member (7) is provided with a through hole (9) through which the insertion part (301) of the locking rod (3) passes. The inner wall of the locking member (7) is provided with an opening (10) through which the locking block (5) passes. When the insertion parts (301) on both sides of the locking rod (3) are aligned with the insertion holes (4) and move downward, the downward force of the locking block (5) is applied to the opening (10), driving the locking member (7) with the opening (10) to move. After the locking rod (3) continues to descend and the locking block (5) passes through the opening (10), the locking member (7) automatically returns to its original position, causing the opening (10) and the locking block (5) to be misaligned, preventing the locking rod (3) from moving upward, so as to lock the locking rod (3); the top of the opening (10) is set with a slope; The locking rod (3) is equipped with a lead screw (13). Rotating the lead screw (13) adjusts the position of the locking block (5) to adjust the reserved height when the locking rod (3) is locked by the locking member (7). The insertion part (301) of the locking rod (3) is provided with a cavity (14) for installing the lead screw (13). The lead screw (13) and the locking rod (3) are rotatably connected. The locking block (5) and the lead screw (13) are connected by threads. The side wall of the insertion part (302) of the locking rod (3) is provided with a slot (15) for the locking block (5) to pass through. The slot (15) has a certain length. Rotating the lead screw (13) drives the locking block (5) to adjust its position along the length direction of the slot (15).

2. The quick-install trailer ball lock according to claim 1, characterized in that: The minimum width (L1) of the opening (10) is greater than the maximum width (L2) of the card block (5).

3. The quick-install trailer ball cover lock according to claim 2, characterized in that: The locking member (7) is connected to a spring member (8), which provides power for the locking member (7) to automatically return to its original position.

4. The quick-install trailer ball lock according to any one of claims 1-3, characterized in that: The top of the connecting arm (1) is provided with a hollow top cover (16), which has a central hole (18) through which the insertion part (301) passes. The locking block (5) installed on the insertion part (301) is located in the hollow cavity inside the top cover (16), and the locking block (5) on the insertion part (301) cannot pass through the central hole (18) on the top cover (16).

5. The quick-install trailer ball cover lock according to claim 1, characterized in that: It also includes a protective element (26) set on the connecting arm (1) for protecting the connecting member (2). By driving the protective element (26) to move, the protective element (26) can switch between the protective and non-protective states of the connecting member (2).

6. The quick-install trailer ball cover lock according to claim 5, characterized in that: Mounting components (34) are provided on both sides of the connecting arm (1). The mounting components (34) are rotatably mounted with a horizontally mounted lead screw (35). The lead screw (35) and the protective component (26) are connected by a thread. By rotating the lead screw (35), the protective component (26) is driven to move left and right along the horizontal direction of the connecting arm (1).

7. The quick-install trailer ball cover lock according to claim 5, characterized in that: The connecting arm (1) has a connecting sleeve (27) on its side wall. The protective component (26) passes through the inside of the connecting sleeve (27). The inner wall of the connecting sleeve (27) provides guidance for the vertical displacement of the protective component (26). The bottom of the connecting arm (1) is stably mounted with a mounting bracket (28). The mounting bracket (28) is rotatably connected to a vertically arranged lead screw (29). The lead screw (29) and the protective component (26) are connected by a thread. The rotation of the lead screw (29) drives the protective component (26) to move up and down along the inner wall of the connecting sleeve (27).

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