Rapidly-assembled trailer ball cover lock

Abstract

The invention relates to the technical field of trailer connectors, in particular to a fast-assembly type trailer ball cover lock which greatly simplifies the operation process, remarkably shortens the operation time and greatly improves the working efficiency and comprises a connecting arm installed on a trailer body, and a connecting piece is arranged on the connecting arm; an inserting hole is formed in the connecting arm, and a locking rod is connected in the inserting hole in an inserting and pulling mode; insertion parts on the two sides of the lock rod penetrate through the insertion hole in the axis direction of the insertion hole. A clamping block is mounted on the insertion part of the lock rod; a locking piece capable of automatically returning is installed in the inserting hole, a through hole allowing the inserting part of the locking rod to penetrate through is formed in the locking piece, and an opening allowing the inserting block to penetrate through is formed in the inner wall of the locking piece; when the inserting parts on the two sides of the lock rod are aligned with the inserting holes and descend, the acting force of descending of the clamping block is applied to the opening, the locking piece with the opening is driven to move, the lock rod continuously descends to enable the clamping block to penetrate through the opening, then the locking piece automatically returns to the original position, the opening and the clamping block are staggered, the lock rod is prevented from ascending, and the lock rod is locked.

Description

Technical Field

[0001] The invention relates to the technical field of trailer connectors, in particular to a quick-install trailer ball cover lock. Background Art

[0002] As we all know, the trailer connector is a key component used to connect the trailer and the tractor. It is mainly made of high-strength metal materials, has excellent toughness and fatigue resistance, and can withstand large tensile and impact forces. Its function is to achieve a stable connection between the trailer and the tractor, ensuring that the two are always reliably connected during transportation.

[0003] The trailer ball cover is a type of trailer connector. The car trailer ball cover lock is a locking device used to fix the trailer ball cover. Existing car 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 matching the nut 17, and the nut 17 is tightened to achieve fixation. During the locking and opening process of the locking rod 3, the nut 17 needs to be rotated several times to complete the operation, and a specific tool, such as a wrench, must be used. The efficiency of unlocking and locking is low, and the whole process is time-consuming and laborious.

[0004] There is also a method on the market that uses a lock core and a 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 specified position, and then perform additional operations on the lock body (inserting and removing the key, turning the key to lock the lock body) to achieve the locking and fixing of the lock rod;

[0005] This design that requires additional operating steps greatly reduces operational efficiency. In the pursuit of an efficient working environment, its limitations become increasingly prominent, and new technical solutions are urgently needed to solve these problems. Summary of the invention

[0006] 1. Technical issues to be resolved

[0007] In view of the deficiencies in the prior art, the present invention provides a quick-install trailer ball cover lock, which solves the problems of too many steps and complicated operation when installing the lock rod in the traditional way.

[0008] (II) Technical solution

[0009] To achieve the above object, the present invention provides the following technical solutions: a quick-install trailer ball cover lock, comprising a connecting arm mounted on a vehicle body, wherein a connecting piece is provided on the connecting arm;

[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 parts on both sides of the locking rod penetrate the insertion hole along the axis direction of the insertion hole;

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

[0013] A locking member that can automatically return to its original position is installed in the socket, a through hole is provided on the locking member for the insertion portion of the locking rod to pass through, and an opening is provided on the inner wall of the locking member for the insertion block to pass through;

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

[0017] This kind of quick-install trailer ball cover lock has a locking piece, a block and an opening that can automatically return to their original position. When locking the lock rod, the user only needs to align the insertion part of the lock rod with the socket and insert it downward. This simple action will allow the locking piece to lock the lock rod as the lock rod descends. No additional operating steps are required throughout the process, and no other complex devices are required, which greatly simplifies the operation process, significantly shortens the operation time, and greatly improves work efficiency. For example, in the trailer connection operation scenario, the quick locking allows the staff to quickly complete the equipment connection, avoiding the time wasted due to the cumbersome traditional locking method.

[0018] When using an external lock body, not only do you need to equip and manage additional keys, but finding the key in an emergency often wastes valuable time, affects the work process, and may even cause safety issues. The nut structure lock requires manual labor to twist, which is slow and cumbersome. The present invention does not require the above-mentioned complicated connection steps, reducing the purchase and management costs of additional equipment, as well as the potential economic losses caused by cumbersome operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of connecting the lock rod through a nut in the prior art;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the present invention, and a first embodiment of installing a protective structure;

[0021] Figure 3 It is a schematic diagram of the explosion structure of the present invention, and a first embodiment of the installation of the protective structure;

[0022] Figure 4 For the present invention Figure 3 A schematic diagram of the structure partially enlarged at position A shown in FIG.

[0023] Figure 5 It is a schematic diagram of the explosion structure of the present invention, and a first embodiment of the installation of the protective structure;

[0024] Figure 6 For the present invention Figure 5 A schematic diagram of the structure of the local enlargement of point B shown in FIG.

[0025] Figure 7 It is a partial cross-sectional three-dimensional structural schematic diagram of the present invention;

[0026] Figure 8 For the present invention Figure 7 A schematic diagram of the structure partially enlarged at C shown in FIG.

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the present invention, wherein a top cover is installed;

[0028] Fig.10 It is a schematic diagram of a cross-sectional three-dimensional structure of the top cover of the present invention;

[0029] Fig.11 For the present invention Fig.10 A schematic diagram of the structure partially enlarged at D shown in FIG.

[0030] Fig.12 It is a schematic diagram of the three-dimensional structure of the present invention, wherein the connecting member is connected to the trailer arm;

[0031] Fig.13 is a schematic diagram of a three-dimensional structure of the present invention, wherein a second embodiment of a protective structure is installed;

[0032] Fig.14 For the present invention Fig.13 A schematic diagram of the structure partially enlarged at E shown in FIG.

[0033] Fig.15 It is a schematic diagram of the three-dimensional structure of the present invention, wherein the card block is fixedly mounted on the locking rod;

[0034] Fig.16 For the present invention Fig.15 A schematic diagram of the structure partially enlarged at F shown in FIG.

[0035] Fig.17 It is a schematic cross-sectional view of the structure of the present invention, wherein the clamping block is adjustably mounted on the locking rod;

[0036] Fig.18 It is a schematic diagram of the explosion structure of the present invention, wherein the clamping block is adjustably mounted on the locking rod;

[0037] Fig.19It is a schematic diagram of the three-dimensional structure of the locking member of the present invention;

[0038] Fig. 20 It is a schematic diagram of the cross-sectional structure of the locking member of the present invention, wherein the opening is arranged as a slope of a plane;

[0039] Fig.21 It is a schematic diagram of the cross-sectional structure of the locking member of the present invention, wherein the force during the descending process of the clamping block acts on the opening to drive the locking member to move;

[0040] Fig. 22 It is a schematic diagram of the three-dimensional structure of the top cover of the present invention.

[0041] In the figure: 1, connecting arm; 2, connecting piece; 3, locking rod; 4, jack; 5, clamping block; 6, bottom cover; 7, locking piece; 8, elastic piece; 9, through hole; 10, opening; 11, dial block; 12, through slot; 13, screw; 14, cavity; 15, notch; 16, top cover; 17, nut; 18, center hole; 19, trailer arm; 20, flange body; 21, limit block; 22, limit slot; 23, A end; 24, B end; 25, screw block; 26, protective piece; 27, connecting sleeve; 28, mounting bracket; 29, screw; 30, screw piece; 31, stopper; 32, convex ring body; 33, hole; 34, mounting piece; 35, screw; 36, screw piece; 37, hole; 38, roller; 301, insertion part; 302, connecting part. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the prior art, Figure 1 As shown, the locking rod 3 and the connecting arm 1 are connected by a nut 17, and a thread matching the nut 17 is arranged on the outer wall of the locking rod 3, and the fixing is achieved by tightening the nut 17.

[0044] See also Figure 2As shown, a quick-install trailer ball cover lock of the present invention comprises a connecting arm 1 mounted on a vehicle body and connected to the vehicle body, the connecting arm 1 and the vehicle body are connected in a fixed manner or in a detachable manner, the fixed connection between the connecting arm 1 and the vehicle body is usually welded or integrally formed, and the detachable connection between the connecting arm 1 and the vehicle body is usually achieved by the cooperation of bolts and nuts to connect the vehicle body and the connecting arm 1; a connecting member 2 is provided on the connecting arm 1, and the connecting member 2 is a spherical structure, but any structure and shape of the connecting member 2 can be applied to the connecting member 2 in the present invention; Fig.12 As shown, a trailer arm 19 matching with the connector 2 is installed on the connector 2, and 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 above-mentioned connecting arm 1 and the vehicle body. After the trailer arm 19 and the connector 2 are connected, the connection between the front and rear vehicles is realized.

[0045] like Fig.12 As shown, the connecting arm 1 and the trailer arm 19 are both made of high-strength materials, such as steel alloy, aluminum alloy and the like, and have good strength and tensile resistance. The connecting arm 1 and the trailer arm 19 are connected by a connecting piece 2 fixedly arranged on the connecting arm 1, and the trailer arm 19 installed on the connecting piece 2 is limited by a locking rod 3 installed on the connecting arm 1 as described in detail below, and the locking rod 3 surrounds the outer side 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 so that the trailer arm 19 can rotate flexibly, that is, the width of both sides of the locking rod 3 is sufficient to meet the angle of rotation of the connecting arm 1 to both sides when the trailer arm 19 and the connecting piece 2 are connected, and the sides of the locking rod 3 will not block the normal rotation of the connecting arm 1, that is, the width of both sides of the locking rod 3 is not limited in the present invention, and can be set arbitrarily according to actual use requirements, but 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 connecting piece 2, and the locking rod 3 prevents the trailer arm 19 from detaching from the connecting piece 2.

[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 portion 301 arranged on both sides and a connecting portion 302 for connecting the insertion portion 301 and formed in one piece. The insertion portions 301 on both sides of the locking rod 3 are vertically arranged, and the connecting portion 302 of the locking rod 3 is bent, but the connecting portion 302 is not limited to the bent arrangement, and can also be horizontally arranged, etc. Plug holes 4 for the insertion portion 301 to pass through are opened on both sides of the connecting arm 1. The locking rod 3 and the plug hole 4 are connected by plugging and pulling. The inner diameter of the plug hole 4 is slightly larger than the diameter of the insertion portion 301, so that the insertion portion 301 on the locking rod 3 can be lifted and lowered along the axial direction of the plug hole 4.

[0047] like Figure 19-21As shown, a block 5 is installed on the insertion portion 301 of the locking rod 3, and a cylindrical locking member 7 is installed in the socket 4. A through hole 9 is provided in the middle position of the locking member 7 for the insertion portion 301 of the locking rod 3 to pass through, and an opening 10 is provided on the inner wall of the locking member 7 for the insertion block 5 to pass through. The minimum width L1 of the opening 10 is greater than the maximum width L2 of the block 5. When the locking rod 3 needs to be locked, the insertion portions 301 on both sides of the locking rod 3 are aligned with the corresponding socket 4 and move downward, and the block 5 begins to descend under the action of external force, and 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 generates relative rotation with 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 potential energy is stored inside the elastic member 8. At the same time, the locking rod 3 can continue to descend until the block 5 successfully passes through the opening 10 of the locking member 7. At this time, the elastic member 8 releases the torque due to the elastic potential energy stored before, driving the locking member 7 to quickly rotate back to the initial position. The locking member 7 automatically returns to the initial position under the action of the elastic member 8, and the bottom of the opening 10 and the top of the block 5 are misaligned. The misaligned block 5 and the opening 10 will restrict 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 , 8, 15, 16, and 19, the elastic member 8 in the present invention plays a role in providing power when the locking member 7 rotates. The elastic member 8 here is a general term. In practical applications, there are many types of elastic members 8 to choose from, and common torsion springs and springs can be used. One end of the elastic member 8 is firmly connected to the locking member 7. The connection method can be selected according to the type of the elastic member 8 and the structural characteristics of the locking member 7, such as welding, riveting, or through a specific slot, connector 2, etc., to ensure that the two are connected reliably and will not fall off or loosen during the operation of the device. The other end of the elastic member 8 is fixedly connected to the connecting arm 1. The fixing method is also selected according to the actual situation, such as bolt tightening, welding forming, etc., to ensure that a stable connection relationship is formed between the elastic member 8 and the connecting arm 1. When the locking member 7 rotates or displaces due to external force, the elastic member 8 will undergo elastic deformation and store energy accordingly. When the external force disappears (the block 5 passes through the opening 10), the elastic member 8 drives the locking member 7 to reset by virtue of the stored elastic potential energy, thereby causing the locking member 7 to automatically return to its initial position.

[0049] like Figure 19-21As shown, in order to enable the block 5 to smoothly pass through the opening 10, the top surface of the opening 10 is designed to be a slope. The slope converts the force of the block 5 moving up and down linearly into the force for providing the locking member 7 to rotate. The slope can be a flat slope or a curved slope. In order to drive the locking member 7 to rotate more smoothly and make it easier for the operator to drive the locking rod 3 to descend, the bottom surface of the block 5 can also be designed to be a slope. The slope at the top of the opening 10 matches the slope at the bottom of the block 5. In the following, for the convenience of description, it is taken as an example that when the insertion portion 301 of the locking rod 3 descends, the force of the block 5 acts on the opening 10 to rotate the locking member 7 clockwise. It can be understood by those skilled in the art that the direction of the slope can be changed, and it can also be set so that when the insertion portion 301 of the locking rod 3 descends, the force of the block 5 acts on the opening 10 to rotate the locking member 7 counterclockwise.

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

[0051] In addition to the flange 20 described above to limit the locking member 7, for example, a mounting groove specifically for the locking member 7 to rotate can also be provided in the jack 4. The shape of this mounting groove is adapted to the locking member 7, allowing the locking member 7 to rotate smoothly therein and limiting the locking member 7 from moving up and down.

[0052] In addition, the movement mode of the locking member 7 of the present invention is not limited to the rotation mode, and the locking member 7 can also be connected to the connecting arm 1 by sliding. When the sliding connection is selected, a slide 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 satisfies the height of the opening 10. The elastic member 8, such as a spring, is used to provide power for the reset of the locking member 7. In actual operation, when the locking member 7 is displaced by the action of the block 5, the spring will be elastically deformed and store energy. Once the external action force is released, the spring drives the locking member 7 to quickly slide and reset by relying on the stored elastic potential energy, and returns to the initial position to lock the block 5.

[0053] In the locking process of the lock rod 3, the lock rod 3 of the present invention greatly simplifies the locking process during the locking process, improves convenience, and is easier to operate. When the lock rod 3 needs to be locked, the user only needs to align the insertion portion 301 of the lock rod 3 with the insertion hole 4 and insert it downward. The lock member 7 can lock the lock rod 3 during the continuous descent of the lock rod 3, and the entire locking process is completed in the process of inserting the lock rod 3 downward. During this entire locking process, no additional operating steps are required, and no other complex devices are required. Compared with traditional locking devices, its limitations are very obvious. Traditional methods often use an external lock body or a nut 17 structure to lock the lock rod 3. When an external lock body is used, not only does it require additional equipment and management of keys, but it is also easy to waste time looking for keys in an emergency. The nut 17 structure needs to be manually twisted, which is a slow and cumbersome process.

[0054] However, the present invention completely abandons these complicated methods. The user only needs to easily insert the lock rod 3 downward, and the various components will cooperate ingeniously. During the insertion, the lock rod 3 is quickly and accurately locked. This design greatly simplifies the operation process and reduces the operation time.

[0055] like Figure 3-4 As shown, in order to realize the unlocking of the lock rod 3 by the locking member 7, so as to ensure that the insertion portion 301 of the lock rod 3 is smoothly pulled out from the insertion hole 4, and the opening 10 of the locking member 7 can be smoothly aligned with the block 5, the present invention has a shifting block 11 firmly fixed on the outer wall of the locking member 7. The shifting block 11 is integrated with the locking member 7 and can transmit the driving force applied from the outside. A through groove 12 adapted to the shifting block 11 is provided on the side wall of the connecting arm 1. The through groove 12 provides a through passage for the shifting block 11, and the shifting block 11 passes through the through groove 12, and there is sufficient space inside the through groove 12 for the shifting block 11 to move. When unlocking is required, the operator can use a tool or manually to shift the shifting block 11 to drive the shifting block 11 to move in the space defined by the through groove 12. As the shifting block 11 moves, the locking member 7 also moves accordingly. In this process, the position of the opening 10 of the locking member 7 moves accordingly until the bottom of the opening 10 is completely aligned with the top of the block 5. At this time, the insertion portion 301 of the locking rod 3 can be smoothly pulled out, completing the unlocking operation of the locking rod 3 .

[0056] In order to further accurately control the rotation angle of the locking member 7, a limit block 21 is fixedly provided on the flange body 20. A limit groove 22 is correspondingly provided on the locking member 7. The limit block 21 and the limit groove 22 cooperate with each other to limit the rotation angle of the locking member 7.

[0057] like Figure 6As shown, when the limit block 21 abuts against one end of the limit slot 22 (the A end 23 of the limit slot 22), the position of the locking member 7 makes the top of the opening 10 and the bottom of the card block 5 to be inserted just in the position to be inserted, which is also the position where the top of the card block 5 and the bottom of the opening 10 are misaligned after the card block 5 passes through the opening 10.

[0058] When unlocking is required, the locking member 7 is operated to rotate by the shifting block 11. As the locking member 7 rotates, when the limiting block 21 abuts against the other end of the limiting groove 22 (the B end 24 of the limiting groove 22), the locking member 7 cannot continue to rotate, and the bottom of the opening 10 of the locking member 7 is precisely aligned with the top of the clamping block 5. At this time, the clamping block 5 can be pulled upward without any obstacles, and the unlocking operation of the lock rod 3 is easily realized.

[0059] The rotation angle of the locking member 7 is limited by the cooperation between the limit block 21 and the limit groove 22, thereby improving the accuracy and stability during the locking and unlocking actions, and the user does not need to worry about operational errors caused by excessive or insufficient rotation of the locking member 7.

[0060] like Figure 2-3 As shown, a bottom cover 6 with a hollow interior is provided on the connecting arm 1 and located at the insertion hole 4 where the locking member 7 is installed. The bottom cover 6 is provided downwardly, and the insertion portion 301 of the locking rod 3 can penetrate the bottom cover 6, ensuring that the locking rod 3 can freely move up and down during normal operation, but the 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 move downward, once the block 5 reaches the position of the bottom cover 6, the bottom cover 6 limits the block 5. Since the block 5 cannot pass through the bottom cover 6, the downward movement of the locking rod 3 is blocked by the bottom cover 6, thereby realizing the precise limitation of the downward position of the locking rod 3.

[0061] Likewise, Figure 10-11 As shown in FIG. 22 , a top cover 16 with a hollow interior is provided on the connecting arm 1 and located at the socket 4 where the locking member 7 is installed. The top cover 16 is arranged upward and has a center hole 18. The size of the center hole 18 is designed to allow the locking rod 3 to pass through smoothly and rotate, that is, the inner diameter of the center hole 18 is slightly larger than the diameter of the locking rod 3. However, the size of the center hole 18 is still not enough to allow the block 5 on the locking rod 3 to pass through, thereby realizing the precise limitation of the upward position of the locking rod 3.

[0062] At the same time Fig.15 As shown, the insertion portion 301 of the locking rod 3 on the side with the locking member 7 is longer, while the insertion portion 301 on the other side is shorter. This design cooperates with the top cover 16, which greatly facilitates the actual operation.

[0063] When the lock rod 3 needs to be pulled out, the top cover 16 will limit the block 5 due to its existence. This limiting function makes it unnecessary to remove the entire lock rod 3 as a whole. The operator only needs to pull the lock rod 3 upward along the center hole 18 and then rotate the lock rod 3. In this way, the lock rod 3 can be flexibly rotated without removing the lock rod 3, which is convenient for 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 lock rod 3 is rotated back to the initial position to realign the lock rod 3 with the socket 4, and the normal plugging and unplugging function of the lock rod 3 can be restored.

[0064] The top cover 16 plays a key role in preventing loss. The top cover 16 connects the locking rod 3 and the connecting arm 1 into an integral structure, avoiding the risk of loss caused by disassembling the locking rod 3, which not only improves the management convenience of the components, but also ensures the integrity of the device during long-term use.

[0065] like Figure 10-11 As shown, the internal fixed setting of the top cover 16 also has a stopper 31. When the lock rod 3 needs to be opened, the lock rod 3 is operated to rotate with the central hole 18 of the top cover 16 as the axis. In this process, the shorter insertion portion 301 on the other side of the lock rod 3 will smoothly escape from the corresponding socket 4. At this time, the lock rod 3 can rotate normally to achieve the opening action of the lock rod 3. When the lock rod 3 needs to be closed after the opening operation is completed, the lock rod 3 is turned back to the initial position. At this time, the stopper 31 plays a key role. Due to the setting of the stopper 31, it can accurately limit the block 5. Under the blocking and limiting action of the stopper 31, the shorter insertion portion 301 on the other side of the lock rod 3 can be accurately positioned with the socket 4, ensuring that the insertion portion 301 is accurately aligned with the socket 4, so as to facilitate the insertion portion 301 to be smoothly and accurately inserted into the socket 4, complete the closing action of the lock rod 3, and ensure the accuracy of the closing of the lock rod 3.

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

[0067] like Figure 17-18As shown, the first embodiment of the connection between the block 5 and the insertion part 301. In the first embodiment, the position of the block 5 at the insertion part 301 is adjustable, and a cavity 14 for installing the lead screw 13 is provided in the insertion part 301 of the locking rod 3. The lead screw 13 and the locking rod 3 are connected by rotation to ensure that the lead screw 13 can rotate flexibly in the locking rod 3. The block 5 and the lead screw 13 are connected by threads, and a notch 15 is provided on the side wall of the insertion part 301 of the locking rod 3. The notch 15 passes through the side wall of the locking rod 3 and has a specific length. The notch 15 defines a motion trajectory for the movement of the block 5, so that it can stably slide in the notch 15 along the length direction of the notch 15. When the locking rod 3 needs to be adjusted, the user rotates the lead screw 13. Due to the threaded connection characteristics of the lead screw 13 and the block 5, the rotation of the lead screw 13 will be converted into a linear motion of the block 5 along the length direction of the notch 15. By controlling the rotation direction and number of turns of the lead screw 13 , the position of the clamping block 5 in the slot 15 can be accurately adjusted.

[0068] The bottom end of the lead screw 13 is provided with a screw block 25 for rotating the lead screw 13. The staff can flexibly select the adjustment method according to actual needs and operating habits. In the case of limited operating space and low adjustment accuracy requirements, the screw block 25 can be directly rotated manually. Hold the screw block 25 by hand and apply force to rotate it clockwise or counterclockwise, thereby driving the lead screw 13 to rotate synchronously. Because the lead screw 13 is connected to the clamping block 5 through a threaded connection, the rotation of the lead screw 13 will be converted into the up and down movement of the clamping block 5 along the notch 15 of the locking rod 3, thereby realizing the adjustment of the height of the clamping block 5.

[0069] If the adjustment resistance is large or more precise fine-tuning is required, the staff can also use tools to assist the operation. For example, using a wrench or other tools to match the screw block 25, through the leverage of the tool, the lead screw 13 can be easily rotated with less force to achieve a more precise adjustment of the height of the clamping block 5.

[0070] Since the insertion portion 301 of the lock 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 downward to a certain length. The significance of this design is that even after the lock rod 3 is locked by the locking member 7, the bottom cover 6 limits the lock rod 3 while not hindering the adjustment operation of the lead screw 13, and the lead screw 13 can be directly rotated and adjusted through the bottom of the bottom cover 6.

[0071] The forces acting on the block 5 and the lead screw 13 are further described in detail. When the lead screw 13 is rotated, the rotational motion of the lead screw 13 generates a circumferential driving force. The spiral structure of the thread is like an inclined plane wound around a cylinder. According to the principle of spiral transmission, 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 enables the lead screw 13 to maintain a stable rotation center in the cavity 14 of the locking rod 3, while the axial force is the key to driving the block 5 to move. Since the block 5 and the lead screw 13 are threaded together, the axial force acts on the thread surface of the block 5 in the axial direction of the lead screw 13. The block 5 cannot follow the lead screw 13 to make a circular motion, and can only convert the axial force transmitted by the lead screw 13 into a linear motion along the length direction of the slot 15 under the constraint of the side wall slot 15 of the locking rod 3. By controlling the rotation direction of the lead screw 13, the moving direction of the block 5 can be accurately controlled. For example, if the lead screw 13 is rotated clockwise, the block 5 will move in a specific (upward) direction along the axial direction; if it is rotated counterclockwise, the block 5 will move in the opposite direction. The opposite setting is also possible. In addition, the number of turns of the lead screw 13 directly determines the distance the block 5 moves. For example, every time the lead screw 13 rotates one circle, the block 5 will move a corresponding distance according to the pitch of the thread. If the pitch is 5 mm, the lead screw 13 rotates two circles, and the block 5 will move 10 mm in the slot 15.

[0072] Therefore, when installing trailer arms 19 of different models in actual use, the advantages of this force conversion are fully demonstrated, especially when there are trailer arms 19 with different heights, the position of the block 5 can be adjusted by rotating the lead screw 13, thereby changing the reserved height above and below the lock rod 3. The reserved height is adjusted steplessly (linearly) by the lead screw 13 and the block 5. For example, in the case of a higher trailer arm 19, the block 5 can be adjusted upward to increase the reserved length above the lock rod 3; for a lower trailer arm 19, the block 5 can be adjusted downward to reserve a suitable height below the lock rod 3. In this way, the device can adapt to trailer arms 19 of various heights, improve the adaptability to different trailer arms 19, and enhance its practicality.

[0073] like Figure 15-16As shown, the second embodiment of the connection between the block 5 and the insertion part 301. In the second embodiment, the block 5 and the insertion part 301 are fixedly connected, usually by welding or one-piece casting process, so that the block 5 and the insertion part 301 of the locking rod 3 are firmly combined into a whole, thereby playing a stable limiting effect on the locking position of the locking member 7 acting on the block 5. When the locking member 7 performs the locking action, the locked position of the block 5 is fixed, so that the reserved space on the insertion part 301 cannot be changed under this fixed connection mode. This feature is particularly advantageous when adapting to a specific trailer arm 19, for example, when connecting the same model of trailer arms 19. Since there is no need to design a complex adjustment structure, the overall structure of the product is greatly simplified. The number of parts is reduced, and the manufacturing process is also simplified, which directly reduces the purchase cost.

[0074] like Figure 10-11 As shown in FIG. 22 , in the first embodiment in which the card block 5 is connected to the inserting portion 301, since the position of the card block 5 has an adjustable feature, in order to ensure that the card block 5 can move freely during the adjustment process without being restricted by the top cover 16, the height of the top cover 16 is set relatively high. This forms a large hollow space inside the top cover 16. This large space provides a sufficient range for the up and down movement of the card block 5. No matter how the position of the card block 5 is adjusted on the locking rod 3, it can move freely inside the top cover 16 without being hindered by insufficient space in the top cover 16, thereby ensuring the adjustment function of the card block 5.

[0075] In the second embodiment where the block 5 is connected to the insertion portion 301, the block 5 is fixedly connected to the insertion portion 301 of the locking rod 3. In this case, the block 5 does not need to be adjusted on the insertion portion 301 of the locking rod 3, and its movement form and range are relatively fixed. Therefore, the top cover 16 does not need to be set too high. The relatively short top cover 16 design has an internal hollow space sufficient to meet the movement requirements of the block 5. This can not only effectively reduce material costs, but also make the overall structure of the product more compact, and improve the aesthetics and space utilization of the product while ensuring the function.

[0076] The present invention provides two embodiments of protective structures for protecting the connector 2, the protective structure includes a protective member 26 installed on the connecting arm 1. In the actual process of connecting the trailer arm 19 and the connector 2, due to factors such as the complex working environment and negligence of the staff, the trailer arm 19 may directly hit or scratch the connector 2 during the connection. This impact or scratch will cause serious damage to the smooth surface of the connector 2, greatly reducing its original smoothness, and in the subsequent towing process, the friction loss between the two connecting parts (trailer arm 19 and connector 2) will be aggravated. In the long run, the service life of the connector 2 and the trailer arm 19 will be severely shortened, and frequent maintenance and replacement will increase the subsequent use cost.

[0077] When the trailer arm 19 approaches the connecting piece 2 and is ready for connection, the staff will make the protective piece 26 intervene in advance to form a stable protective barrier between the connecting piece 2 and the trailer arm 19. Once the trailer arm 19 is accidentally hit or scratched, the protective piece 26 can first withstand the impact force to avoid direct rigid contact between the trailer arm 19 and the connecting piece 2, thereby effectively protecting the connecting piece 2 from damage.

[0078] The protective member 26 can be moved according to the use requirements. When the connector 2 needs to be protected, the protective member 26 can be moved to a designated protective position. The protective member 26 in this position can completely block the trailer arm 19 from the connector 2 when it is close to the trailer arm 19. Once the trailer arm 19 is accidentally hit, the protective member 26 will first bear the impact force to prevent the connector 2 from being damaged, thereby playing an effective protective role for the connector 2. When the connector 2 and the trailer arm 19 need to be connected normally and the protective member 26 is not needed for protection, the protective member 26 only needs to be moved away from the protective position and moved to other positions that do not hinder the connection between the connecting arm 1 and the connector 2.

[0079] like Figure 2-12 As shown, the first embodiment of the protective structure of the present invention is shown. In the first embodiment, by driving the protective member 26 to move upward or downward, the protective and non-protective states of the connecting member 2 are switched by the protective member 26. A connecting sleeve 27 is provided on the side wall of the connecting arm 1, and the protective member 26 passes through the interior of the connecting sleeve 27. The inner wall of the connecting sleeve 27 provides a guide for the up and down displacement of the protective member 26. The protective member 26 can move up and down along the inner wall of the connecting sleeve 27, ensuring that the protective member 26 always maintains a stable trajectory during the movement, and will not deviate or shake, while improving the stability and anti-collision performance of the protective member 26.

[0080] A stable mounting frame 28 is installed at the bottom of the connecting arm 1, and a vertically arranged screw rod 29 is rotatably connected to the mounting frame 28, and the screw rod 29 can be rotatably connected through a precision bearing. The screw rod 29 and the protective member 26 are connected by a thread. When the screw rod 29 rotates, the rotational motion of the thread can be accurately converted into the linear up and down motion of the protective member 26. The protective member 26 is driven to move up and down by thread transmission. The working principle can be referred to above, and the principle of using the screw 13 to drive the block 5 to move.

[0081] Protection state switching: When the connector 2 needs to be protected, the screw 29 is rotated manually by operating a tool (such as a wrench). Due to the threaded connection between the screw 29 and the protective member 26, the positive rotation of the screw 29 drives the protective member 26 to move upward along the inner wall of the connecting sleeve 27. When the protective member 26 rises to the specified position, it can form a reliable protective barrier between the trailer arm 19 and the connector 2, effectively preventing the trailer arm 19 from accidentally hitting the connector 2 during the connection process.

[0082] Non-protective state switching: When the connector 2 and the trailer arm 19 need to be connected normally without the intervention of the protective member 26, the screw rod 29 is rotated in the opposite direction. Driven by the screw rod 29, the protective member 26 will move downward along the connecting sleeve 27 until it completely breaks away from the obstruction of the connection path of the connector 2, and reaches the non-protective position that does not hinder the connection between the connecting arm 1 and the connector 2.

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

[0084] The end of the screw rod 29 is fixedly connected with a screw member 30, which is a regular polygonal structure, and its diameter is larger than the diameter of the screw rod 29, so that the operator can apply force to rotate the screw rod 29. The screw member 30 and the screw rod 29 are connected by high-strength welding or threaded fastening, and the screw member 30 can also ensure that the screw rod 29 will not move upward. A hole 33 is provided on the screw member 30, and the diameter of the hole 33 is compatible with the size of a common plug rod. When the screw rod 29 needs to be rotated, the plug rod can be inserted into the hole 33 of the screw member 30, and the screw member 30 and the screw rod 29 can be driven to rotate together by rotating the plug rod, which is more convenient to operate and also increases the torque transmission efficiency, so that the operator can control the rotation of the screw rod 29 more easily and accurately.

[0085] In addition to the above-described method of driving the protective member 26 to move linearly up and down along the inner wall of the connecting sleeve 27 by the screw rod 29 to protect the connecting member 2, the protective member 26 can also be moved up and down in the connecting sleeve 27 by other methods, and the position of the protective member 26 can be fixed after the protective member 26 moves into place. For example, the protective member 26 and the connecting sleeve 27 are connected by sliding, and the protective member 26 can be directly driven manually to move up and down along the inner wall of the connecting sleeve 27. A top screw is installed on the connecting sleeve 27 by threading, and the screwed-in end of the top screw can be abutted against the outer wall of the protective member 26. When the top screw is tightened, the top screw can fix the position of the protective member 26, and a positioning hole for inserting the top screw can be opened on the outer wall of the protective member 26. When the top screw is inserted into the positioning hole, its stability is significantly improved. When the top screw is screwed out, the protective member 26 can continue to move up and down.

[0086] like Figure 13-14 As shown, a second embodiment of the protective structure of the present invention is shown. In the second embodiment, by driving the protective member 26 to move left and right, the protective and non-protective states of the connecting member 2 are switched by the protective member 26. Mounting members 34 are provided on both sides of the connecting arm 1, and a horizontally arranged screw rod 35 is rotatably mounted on the mounting member 34, and the screw rod 35 can be rotatably connected through a precision bearing. The screw rod 35 and the protective member 26 are connected by a threaded connection. When the screw rod 35 rotates, the rotational movement of its thread can be accurately converted into the left and right movement of the protective member 35. The threaded transmission is used to drive the protective member 26 to move left and right. Its working principle can be referred to the above-mentioned principle of using the screw 13 to drive the block 5 to move.

[0087] The side walls of the protective member 26 and the connecting arm 1 are against each other, and the protective member 26 can be displaced in the horizontal direction of the connecting arm 1, ensuring that the protective member 26 always maintains a stable track during the movement, and will not deviate or shake, while improving the stability and anti-collision performance of the protective member 26. A slide groove for the horizontal movement of the protective member 26 can also be provided on the connecting arm 1, or a guide rail protruding outward is provided on the connecting arm 1, and a guide groove matching the guide rail is provided on the protective member 26, and the guide groove on the protective member 26 slides along the guide rail.

[0088] Protection state switching: When the connector 2 needs to be protected, the screw rod 35 is rotated manually by operating a tool (such as a wrench). Due to the threaded connection between the screw rod 35 and the protective member 26, the positive rotation of the screw rod 35 drives the protective member 26 to move horizontally along the outer wall of the connecting arm 1. When the protective member 26 moves to the specified position, it can form a reliable protective barrier between the trailer arm 19 and the connector 2, effectively preventing the trailer arm 19 from accidentally hitting the connector 2 during the connection process.

[0089] Non-protective state switching: When the connecting member 2 and the trailer arm 19 need to be connected normally without the intervention of the protective member 26, the screw rod 35 is rotated in the opposite direction. Driven by the screw rod 35, the protective member 26 will move sideways along the outer wall of the connecting arm 1 until it completely breaks away from the obstruction of the connection path of the connecting member 2, reaching a non-protective position that does not hinder the connection between the connecting arm 1 and the connecting member 2. The position where the protective member 26 moves to both sides makes the protective member 26 not hinder the rotation of the trailer arm 19.

[0090] In order to reduce the friction between the guard 26 and the trailer arm 19 when the guard 26 moves horizontally, and to prevent the guard 26 from causing wear to the trailer arm 19, a rotatable roller 38 is provided on the top of the guard 26. When the guard 26 moves horizontally, the roller 38 is in direct contact with the surface of the trailer arm 19. Compared with the sliding friction between the traditional guard 26 and the trailer arm 19, the rolling friction of the roller 38 greatly reduces the friction between the two. Since the roller 38 can roll freely, when the guard 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 the friction, thereby preventing the guard 26 from causing unnecessary wear to the trailer arm 19 during the movement, and extending the service life of the trailer arm 19.

[0091] Since a rotatable roller 38 is provided on the guard member 26, in order to improve the stability of the guard member 26 supporting the trailer arm 19 at the top, two guard members 26 are provided, and the screw rod 35 is a bidirectional screw rod. The threads on both sides of the screw rod 35 have opposite rotation directions, and the corresponding threads on both sides of the guard member 26 and the screw rod 35 are connected by threads. When the screw rod 35 is rotated, the guard members 26 on both sides can be driven to move closer to or away from each other at the same time. Since two guard members 26 are provided, the stability of the guard member 26 in supporting the trailer arm 19 supported by the top thereof is significantly improved. When the trailer arm 19 and the connecting member 2 are aligned up and down, the guard member 26 is driven to move to both sides by rotating the screw rod 35. When the trailer arm 19 falls, it directly falls on the connecting member 2 to achieve connection, and the width of the guard members 26 on both sides will not hinder the rotation angle of the trailer arm 19 during normal towing.

[0092] Both ends of the screw rod 35 are fixedly connected with a screw 36, which is a regular polygonal structure, and its diameter is larger than the diameter of the screw rod 35, so that the operator can apply force to rotate the screw rod 35. The screw 36 and the screw rod 35 are connected by high-strength welding or threaded fastening, and the screw 36 can also ensure that the screw rod 35 will not move left and right. A hole 37 is provided on the screw 36, and the diameter of the hole 37 is compatible with the size of a common plug. When the screw rod 35 needs to be rotated, the plug can be inserted into the hole 37 of the screw 36, and the screw 36 and the screw rod 35 can be driven to rotate together by rotating the plug, which is more convenient to operate and also increases the torque transmission efficiency, so that the operator can control the rotation of the screw rod 35 more easily and accurately.

[0093] In addition to the above-described method of driving the protective member 26 to move horizontally along the outer wall of the connecting arm 1 by the screw rod 35 to protect the connecting member 2, the protective member 26 can also be moved horizontally along the outer wall of the connecting arm 1 by other methods. When the protective member 26 moves into place, the position of the protective member 26 is fixed. For example, a slide bar is installed on the mounting member 34. The protective member 26 and the slide bar are connected by sliding. The protective member 26 can be directly driven manually to move horizontally along the length direction of the slide bar. A top screw is installed on the protective member 26 by thread. The screwed-in end of the top screw can be against the outer wall of the slide bar. When the top screw is tightened, the top screw is against the outer wall of the slide bar. The top screw can fix the position of the protective member 26, and a positioning hole for inserting the top screw can be opened on the outer wall of the slide bar. When the top screw is inserted into the positioning hole, its stability is significantly improved. When the top screw is screwed out, the protective member 26 can continue to move horizontally along the length direction of the slide bar.

[0094] In order to further prevent the lock rod 3 from being stolen, a lock hole is provided on the shift block 11, and a metal lock nose is fixedly provided on the connecting arm 1, which is shaped like a "U", or a perforation is provided on the block, and the lock nose and the lock hole on the shift block 11 work together, and the user needs to equip a common lock, such as a padlock, etc. The anti-theft function can be achieved by passing the lock body through the lock hole and lock nose of the shift block 11.

[0095] The user can selectively lock the door for anti-theft. If frequent locking is not required, the lock can be omitted. The lock can be used when locking is required.

[0096] Use in non-anti-theft state (suitable for safe areas): In safe environments such as parks, factories, and your own courtyards where frequent locking is not required, there is no need to use the lock body. At this time, the shift block 11 can move freely, which is convenient for disassembly and installation of the lock rod 3. When frequently changing the connected vehicle body, this non-locking state can greatly improve work efficiency and reduce the time wasted by repeatedly unlocking and locking the traditional built-in lock body.

[0097] Use in anti-theft state (suitable for unfamiliar environments): When the vehicle needs to be towed to an unfamiliar environment (when going out), it needs to be locked for safety reasons. Insert the lock rod 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 shift block 11 in sequence, lock the lock body, complete the locking of the equipment, and play an anti-theft role.

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

[0099] Protection preparation: Before the trailer arm 19 is connected to the connector 2, the protective member 26 is moved to a position that can effectively protect the connector 2 according to the driving method of the protective member 26. If the screw rod 29, 35 is used for driving, the screw rod 29, 35 is driven to rotate by tools or hands to move the protective member 26 to the predetermined protection position; if manual driving is used, the protective member 26 is directly held by hand and moved to the designated position in the designated direction, and then the top screw is tightened to fix the protective member 26. At this time, the protective member 26 will form a protective barrier for the connector 2 to prevent the subsequent hard contact between the trailer arm 19 and the connector 2 from causing damage to the connector 2.

[0100] Unlocking operation: open the locking rod 3, completely pull the locking rod 3 out of the insertion hole 4, or pull out the shorter insertion portion 301 on one side of the locking rod 3, and then rotate the locking rod 3 as a whole, and now the trailer arm 19 is ready for installation.

[0101] After the trailer arm 19 is in place, move the trailer arm 19 to a suitable position (so that it can move to a position where it can be smoothly docked with the connector 2). During this process, pay attention to the relative positions of the trailer arm 19, the protective member 26, and the connector 2 to avoid collision. Even if a collision occurs, the protective member 26 will not cause the trailer arm 19 and the connector 2 to collide. When the trailer arm 19 reaches a suitable position, release the fixed state of the protective member 26. If it is driven by the lead screw 29, 35, turn the lead screw 29, 35 in the opposite direction to remove the protective member 26; if it is manually driven, loosen the top screw and manually remove the protective member 26 to ensure that it does not hinder 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 that the two are accurately connected.

[0103] Locking limit: After completing the connection between the trailer arm 19 and the connecting piece 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 hole 4 and move downward, the block 5 begins to descend under the action of external force, and this force is precisely applied to the opening 10 of the locking piece 7. When the locking bar 3 is in a state of being moved upward, the locking bar 3 is locked and the locking bar 3 is in a state of being moved downward.

[0104] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention 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 a vehicle body, the connecting arm (1) being provided with a connecting piece (2), and the connecting arm (1) being provided with a plug hole (4); The locking rod (3) comprises an inserting portion (301) arranged on both sides, the locking rod (3) is connected to the plug hole (4) by plugging and pulling, and the inserting portions (301) on both sides of the locking rod (3) penetrate the plug hole (4) along the axial direction of the plug hole (4); Features: A clamping block (5) is installed on the insertion portion (301) of the locking rod (3); The locking member (7) comprises a locking member (7) which can automatically return to its original position, the locking member (7) being installed in the insertion hole (4), the locking member (7) being provided with a through hole (9) for the insertion portion (301) of the locking rod (3) to pass through, and the inner wall of the locking member (7) being provided with an opening (10) for the insertion block (5) to pass through; When the insertion portions (301) on both sides of the locking rod (3) are aligned with the insertion hole (4) and move downward, the downward force of the clamping 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 clamping block (5) passes through the opening (10), the locking member (7) automatically returns to its original position to misalign the opening (10) and the clamping block (5), thereby preventing the locking rod (3) from moving upward and locking the locking rod (3).

2. The quick-install trailer ball cover 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 block (5).

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

4. The quick-install trailer ball cover lock according to claim 1, characterized in that: The top of the opening (10) is arranged in a slope.

5. The quick-install trailer ball cover lock according to claim 1, characterized in that: A lead screw (13) is installed inside the locking rod (3), and the lead screw (13) is rotated to adjust the position of the clamping block (5) so as to adjust the reserved height when the locking rod (3) is locked by the locking member (7).

6. The quick-install trailer ball cover lock according to claim 5, characterized in that: A cavity (14) for mounting a lead screw (13) is provided in the insertion portion (301) of the locking rod (3); the lead screw (13) and the locking rod (3) are rotatably connected; the clamping block (5) and the lead screw (13) are threadedly connected; a slot (15) for the clamping block (5) to pass through is provided on the side wall of the insertion portion (302) of the locking rod (3); the slot (15) has a certain length; the lead screw (13) is rotated to drive the clamping block (5) to adjust its position along the length direction of the slot (15).

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

8. The quick-install trailer ball cover lock according to claim 1, characterized in that: It also comprises a protective member (26) arranged on the connecting arm (1) for protecting the connecting member (2), and the protective member (26) is driven to move so as to switch between a protective state and a non-protective state of the connecting member (2).

9. The quick-install trailer ball cover lock according to claim 8, characterized in that: Mounting parts (34) are arranged on both sides of the connecting arm (1), and the mounting parts (34) are rotatably mounted on a screw rod (35) arranged horizontally, and the screw rod (35) is connected to the protective part (26) by a threaded connection, and the protective part (26) is driven to move left and right along the horizontal direction of the connecting arm (1) by rotating the screw rod (35).

10. The quick-install trailer ball cover lock according to claim 8, characterized in that: The side wall of the connecting arm (1) is provided with a connecting sleeve (27), the protective member (26) passes through the interior of the connecting sleeve (27), and the inner wall of the connecting sleeve (27) provides a guide for the upward and downward displacement of the protective member (26); a mounting frame (28) is firmly installed at the bottom of the connecting arm (1), the mounting frame (28) is rotatably connected to a vertically arranged screw rod (29), the screw rod (29) and the protective member (26) are connected by threads, and the protective member (26) is driven to move up and down along the inner wall of the connecting sleeve (27) by the rotation of the screw rod (29).

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