A towing vehicle hook anti-falling locking device

Abstract

The utility model discloses a towing vehicle hook anti -drop locking device, including fixed plate and clamping plate, the utility model discloses a fixed plate is set up in trailer hook rod body, and the both sides of fixed plate are provided with clamping plate, and the motor connection of clamping plate and fixed plate side wall, after trailer hook is fixed with motor vehicle screw hole through screw rod, and through the starting motor drives two clamping plates to be far away from each other, and the clamping plate is unfolded and is abutted to the frame near motor vehicle connecting screw hole, can assist the fixed of trailer hook, effectively prevent the drop of the loosening of screw rod when using trailer hook, reduce the potential safety hazard.

Description

Technical Field

[0001] This utility model relates to the field of tractor hook technology, specifically a tractor hook anti-detachment locking device. Background Technology

[0002] A trailer hitch, also known as a trailer ball, ball-type rear tow hook, or drawbar, typically consists of two parts: a fixed bracket that is attached to the rear or front bumper of the vehicle, and a high-strength trailer ball or clip. In some regions, in addition to these two parts, the trailer hitch also needs to be equipped with a power harness (power control unit) to provide power to the rear indicator lights and braking system of towed vehicles such as caravans, and to control the towed equipment.

[0003] Existing trailer hitches have the following problems when in use: 1. Existing trailer hitches are usually fixed by connecting a screw to the dedicated screw hole of the vehicle's trailer hitch using a screw rod. However, they lack a protective structure, and if the trailer hitch falls off, the tow rope may pop out, causing safety hazards; 2. Existing trailer hitches lack a buffer mechanism. When the trailer hitch detaches, it may hit the vehicle frame near the connection screw hole, causing damage to the frame. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0005] Therefore, the purpose of this utility model is to provide a tow hook anti-detachment locking device. By setting a fixing plate on the tow hook rod, and setting a locking plate on both sides of the fixing plate, the locking plate is connected to a motor on the side wall of the fixing plate. After the tow hook is fixed to the screw hole of the motor vehicle by the screw, the motor is started to drive the two locking plates to move away from each other. The locking plates unfold and abut against the frame near the screw hole of the motor vehicle, which can assist in fixing the tow hook and effectively prevent it from falling off due to the screw loosening during use, thus reducing safety hazards.

[0006] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: A tractor hook anti-detachment locking device, comprising: A fixed plate, which is a rectangular plate structure, is provided with a trailer hook on the front side wall of the fixed plate. The trailer hook is circular, and a connecting rod is provided on the outer wall of the trailer hook. The front end of the connecting rod is welded to the outer wall of the trailer hook, and the tail end of the connecting rod is welded to the front side wall of the fixed plate and located at the center of the front side wall of the fixed plate. A screw is welded to the rear side wall of the fixed plate. The screw is coaxial with the connecting rod. Horizontal plates are installed at the top and bottom of the fixed plate. Two horizontal plates are symmetrically located on the front side wall of the fixed plate. A threaded rod with positive and negative threads is rotatably connected between the two horizontal plates. A motor is installed at the top of the upper horizontal plate. The output end of the motor extends between the two horizontal plates and is connected to the threaded rod with positive and negative threads. The clamping plates are two in number and symmetrically located on the front side wall of the fixing plate. The connecting rod is located between the two clamping plates. Each of the two clamping plates has a sliding plate installed on a section close to each other. The top of the sliding plate has a threaded hole, and the positive and negative threaded rod rotates through the threaded hole.

[0007] As a preferred embodiment of the anti-detachment locking device for a tractor hook described in this utility model, a guide rod is installed between the two horizontal plates, and a guide hole is provided at the top of the sliding plate, with the guide rod passing through the guide hole.

[0008] As a preferred embodiment of the anti-detachment locking device for a tractor hook described in this utility model, a baffle is installed at one end of the two locking plates that are far apart from each other.

[0009] As a preferred embodiment of the anti-detachment locking device for a tractor hook according to the present invention, it further includes a buffer plate, which is located on the side wall of the baffle. A rubber pad is installed on the side wall of the buffer plate, and a spring is installed on the other side wall of the buffer plate, with the other end of the spring abutting against the side wall of the baffle.

[0010] As a preferred embodiment of the anti-detachment locking device for a tractor hook described in this utility model, a transverse baffle is installed on the side wall of the baffle, a limiting plate is installed at the other end of the transverse baffle, and a limiting hole is formed on the side wall of the limiting plate.

[0011] As a preferred embodiment of the anti-detachment locking device for a tractor hook according to the present invention, a sliding rod is installed on the side wall of the buffer plate, and the other end of the sliding rod passes through the limiting hole and is fitted with a second limiting plate, the diameter of the second limiting plate being larger than the diameter of the limiting hole.

[0012] Compared with existing technologies, this tractor hook anti-detachment locking device effectively solves the problems of detachment risk and impact damage in the use of existing trailer hooks through the synergistic effect of various technical features. The specific technical effects are as follows: 1. Significant Anti-Loss Effect: The device uses a fixed plate, trailer hook, connecting rod, and screw to form a basic connection structure. The screw connects to the screw hole of the vehicle for initial fixation. Simultaneously, the horizontal plates at the top and bottom of the fixed plate, the threaded rods (both positive and negative threads), and the motor form a drive mechanism. Combined with the threaded transmission structure of the clamping plate and sliding plate, the motor drives the two clamping plates to move away from each other and abut against the vehicle frame. This dual-fixing method (main screw fixation + auxiliary clamping plate contact) effectively addresses situations where the screw may loosen. Even if a gap appears between the screw and the screw hole, the contact between the clamping plate and the frame prevents the trailer hook from detaching entirely, significantly reducing safety hazards such as the tow rope popping out or the towed object becoming uncontrollable due to the hook detaching during towing.

[0013] 2. Improved operational stability: The matching structure of the guide rod and guide hole provides precise guidance for the movement of the clamping plate, avoiding offset, jamming or tilting caused by the radial force generated by the rotation of the positive and negative threaded rod during the expansion or contraction of the clamping plate. This ensures that the two clamping plates always move smoothly in a symmetrical direction, ensuring uniform force when abutting the frame, and further enhancing the reliability of auxiliary fixing.

[0014] 3. Comprehensive cushioning protection: The combined structure of the baffle, buffer plate, rubber pad, and spring transforms the rigid contact between the tow hook and the frame into an elastic contact. When the tow hook tends to detach and causes the tow hook to impact the frame, the rubber pad first contacts the frame for initial cushioning. Subsequently, the spring absorbs the impact force through compression, reducing the instantaneous force on the frame and tow hook, preventing the frame from deforming or scratching due to the impact, while also protecting the device itself from damage and extending its service life.

[0015] 4. Reliable buffer structure with precise positioning: The cooperation of the transverse baffle, limiting plate, limiting hole, slide rod, and limiting plate effectively limits the movement range of the buffer plate. When the slide rod slides along the limiting hole, the limiting plate prevents the buffer plate from deviating from the preset trajectory due to spring rebound or excessive external force, ensuring that the spring always functions within its effective extension range, avoiding buffer structure failure, and guaranteeing the stability and consistency of the buffering effect. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them: Figure 1 This is an overall structural diagram of a tractor hook anti-detachment locking device according to the present invention; Figure 2 This is a structural diagram of the fixing plate of the anti-detachment locking device for a tractor hook according to the present invention; Figure 3 This is a structural diagram of a locking plate for an anti-detachment locking device for a tractor hook according to this utility model; Figure 4 This is a structural diagram of the buffer plate of the anti-detachment locking device for a tractor hook according to the present invention. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views showing the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, in actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0020] This utility model provides a tow hook anti-detachment locking device. By setting a fixing plate on the tow hook rod, and setting a locking plate on both sides of the fixing plate, the locking plate is connected to a motor on the side wall of the fixing plate. After the tow hook is fixed to the screw hole of the vehicle by the screw, the motor is started to drive the two locking plates to move away from each other. The locking plates unfold and abut against the frame near the connection screw hole of the vehicle, which can assist in fixing the tow hook and effectively prevent it from falling off due to the screw loosening during use, thus reducing safety hazards.

[0021] Example 1 This solution discloses a tractor hook anti-detachment locking device, which mainly includes: a fixing plate 100, a trailer hook 110, a connecting rod 120, a screw 130, a cross plate 140, a threaded rod with positive and negative threads 150, a motor 160, a locking plate 200, a sliding plate 210, and a threaded hole 220.

[0022] Solution Analysis: The fixing plate 100 is a rectangular plate structure. A connecting rod 120 connects to the trailer hook 110 at the center of its front sidewall. The trailer hook 110 is annular. The front end of the connecting rod 120 is welded to the outer wall of the trailer hook 110, and the rear end is welded to the front sidewall of the fixing plate 100. This ensures that when the trailer hook 110 is under stress, the force is evenly transmitted to the fixing plate 100 through the connecting rod 120. The screw 130 welded to the rear sidewall of the fixing plate 100 is coaxial with the connecting rod 120. This ensures that when the screw 130 is connected to the bolt hole of the vehicle, the direction of force on the trailer hook 110 is consistent with the axis of the screw 130, reducing loosening of the screw due to eccentric force. A horizontal plate 140 is symmetrically mounted on the top and bottom of the fixed plate 100. A threaded rod 150 with opposite threads is rotatably connected between the two horizontal plates 140. The output end of a motor 160 on the top of the upper horizontal plate 140 is connected to the threaded rod 150, forming the drive core. Two clamping plates 200 are symmetrically located on the front sidewall of the fixed plate 100 and on both sides of the connecting rod 120. A sliding plate 210 mounted at one end of the plate 200 engages with the threaded rod 150 through a threaded hole 220 at the top. The innovation of this structure lies in using a motor to drive the threaded rod to rotate, achieving synchronous reverse movement of the two clamping plates through screw drive. This replaces the traditional manual fixing method, making operation not only convenient but also allowing precise control of the clamping plate unfolding range, ensuring a tight fit with the vehicle frame. This solves the problem of existing trailer hooks relying solely on screw fixation being prone to loosening and detachment.

[0023] Technical Effects: After the trailer hook is fixed to the vehicle's bolt hole via screw 130, the starter motor 160 drives the threaded rod 150 to rotate. Because the two sections of the threaded rod 150 have opposite thread directions, the two sliding plates 210 cause the clamping plate 200 to move in opposite directions and move away from each other, eventually abutting against the vehicle frame near the bolt hole. At this point, screw 130 provides the main fixing force, and the abutment between the clamping plate 200 and the frame provides auxiliary fixing. Even if the screw 130 loosens due to vibration or uneven force during towing, the clamping plate 200 can prevent the trailer hook 110 and fixing plate 100 from falling off as a whole through its abutment against the frame, significantly reducing the accident rate. Simultaneously, the automated operation driven by the motor reduces the tediousness of manual fixing, improves the ease of use of the device, and is suitable for rapid installation and fixing under various working conditions.

[0024] Example 2 This solution discloses a tractor hook anti-detachment locking device, which, based on embodiment 1, further includes: a guide rod 170 and a guide hole 230.

[0025] Solution Analysis: A guide rod 170 is installed between the two horizontal plates 140. A guide hole 230 is opened at the top of the slide plate 210, and the guide rod 170 passes through the guide hole 230. The guide rod 170 is set parallel to the threaded rod 150, and its length is adapted to the distance between the two horizontal plates 140. The diameter of the guide hole 230 is slightly larger than the diameter of the guide rod 170 to ensure that the slide plate 210 can slide smoothly along the guide rod 170. The innovation of this structure lies in supplementing the guide constraint, solving the problem that the slide plate is prone to displacement due to thread clearance or radial force when relying solely on the threaded rod for transmission. The guide rod 170 provides rigid support for the movement of the slide plate 210, ensuring that the two clamping plates 200 always move in the preset direction (perpendicular to the direction of the fixed plate 100), avoiding the clamping plates tilting, jamming, or interference with the connecting rod 120.

[0026] Technical Effects: The cooperation between the guide rod 170 and the guide hole 230 significantly improves the stability and accuracy of the movement of the clamping plate 200. When the motor 160 drives the threaded rod 150 to rotate, the slide plate 210 slides along the guide rod 170 during threaded transmission, effectively counteracting the radial force generated during thread engagement and preventing the clamping plate 200 from swaying left and right or tilting forward and backward. This ensures that the two clamping plates 200 always maintain a symmetrical state, resulting in more precise contact with the frame after unfolding, more even force distribution, and avoiding auxiliary fixing failure caused by misalignment of one side of the clamping plate. At the same time, the guide structure reduces wear between the slide plate and the threaded rod, extends the service life of the threaded transmission components, and improves the overall reliability of the device, making it particularly suitable for scenarios with long-term and frequent use.

[0027] Example 3 This solution discloses a tractor hook anti-detachment locking device, which, based on embodiment 2, also includes a baffle 240.

[0028] Solution Analysis: A baffle 240 is installed at the far end of the two clamping plates 200. The baffle 240 is a rectangular plate structure with an area larger than the cross-sectional area of ​​the end of the clamping plate 200, and is welded perpendicularly to the clamping plate 200. The innovation of this structure lies in increasing the contact area between the clamping plate 200 and the vehicle frame, solving the problems of excessive local stress on the frame (easily causing frame dents) and the clamping plate easily sinking into frame gaps when the clamping plate ends directly abut against the frame. The baffle 240 disperses the abutting force of the clamping plate 200 to a larger area of ​​the frame, while enhancing the structural strength of the clamping plate ends and preventing the clamping plate from bending or breaking due to long-term abutment.

[0029] Technical Effects: When the pallet 200 unfolds and abuts against the frame, the baffle 240 contacts the frame first. Its larger contact area disperses and transfers the thrust of the pallet to the frame, reducing the pressure per unit area on the frame and effectively preventing deformation or damage to the frame due to excessive local stress. Simultaneously, the baffle 240 enhances the rigidity of the end of the pallet 200. Even when the tow hook experiences significant tension during traction, increasing the stress on the pallet, the baffle 240 can stably withstand the force, preventing the end of the pallet from bending and ensuring reliable contact between the pallet and the frame. This further improves the stability of the auxiliary fixation and reduces the risk of anti-detachment failure due to pallet deformation.

[0030] Example 4 This solution discloses a tractor hook anti-detachment locking device, which, based on embodiment 3, further includes: a buffer plate 300, a rubber pad 310, and a spring 320.

[0031] Solution Analysis: The buffer plate 300 is located on the side wall of the baffle 240, and its shape is adapted to the baffle 240. A rubber pad 310 (made of highly elastic and wear-resistant rubber) is attached to the side wall. Multiple springs 320 (compression springs, initially slightly compressed) are evenly distributed on the other side wall, with the other end of each spring abutting against the side wall of the baffle 240. The innovation of this structure lies in introducing an elastic buffering mechanism, solving the problem of impact damage easily caused when the baffle plate makes rigid contact with the frame. The rubber pad 310 absorbs the initial impact force and increases friction with the frame, while the springs 320 absorb subsequent impact forces through elastic deformation, forming a dual protection of "initial rubber buffering + secondary spring buffering." Simultaneously, the buffer plate 300 acts as an intermediate carrier, ensuring the even transmission of buffering force.

[0032] Technical Effect: When the trailer hitch tends to detach and causes the clamping plate 200 to move towards the chassis, the rubber pad 310 on the buffer plate 300 first contacts the chassis, using the elastic deformation of the rubber to absorb part of the impact force and reduce the severity of the initial impact. Subsequently, the reaction force of the chassis on the buffer plate 300 compresses the spring 320, and the spring 320 further absorbs energy through deformation, converting the instantaneous impact force into elastic potential energy, significantly reducing the force transmitted to the baffle 240, clamping plate 200, and chassis. This buffering effect not only protects the chassis from impact damage (such as scratches and dents) but also reduces the vibration and wear of the device itself (clamping plate, baffle) caused by impact, extending the service life of the device. Especially under conditions such as rough roads or emergency braking, it can effectively mitigate the impact between the trailer hitch and the chassis.

[0033] Example 5 This solution discloses a tractor hook anti-detachment locking device, which, based on embodiment 4, further includes: a transverse baffle 250, a limiting plate 260, and a limiting hole 270.

[0034] Solution Analysis: A transverse baffle 250 is welded to the side wall of baffle 240. The transverse baffle 250 is a long strip plate, and a limiting plate 260 (circular or rectangular) is welded to its other end. A limiting hole 270 (circular, with a diameter adapted to the subsequent sliding rod) is formed on the side wall of the limiting plate 260. The innovation of this structure lies in providing lateral constraint for the movement of the buffer plate 300, solving the problem of tilting and displacement caused by uneven force when the buffer plate relies solely on spring support. The transverse baffle 250 and the limiting plate 260 form a stable limiting frame, while the limiting hole 270 provides trajectory guidance for the movement of the subsequent sliding rod, ensuring that the buffer plate always moves in a preset direction (perpendicular to the direction of baffle 240).

[0035] Technical Effects: The transverse baffle 250 and the limiting plate 260 restrict the horizontal displacement of the buffer plate 300, preventing it from shifting or tilting during buffering due to the lateral force of the spring 320 or unevenness of the frame surface. This ensures that the contact between the buffer plate 300 and the frame is always surface contact rather than point contact, guaranteeing that the buffering effect of the rubber pad 310 and the spring 320 is evenly exerted. Simultaneously, the limiting hole 270 provides a precise movement trajectory for the slide rod, laying the foundation for subsequently limiting the maximum compression of the buffer plate and ensuring the stability and reliability of the buffer structure.

[0036] Example 6 This solution discloses a tractor hook anti-detachment locking device, which, based on embodiment 5, further includes: a slide bar 330 and a second limiting plate 340.

[0037] Solution Analysis: A sliding rod 330 (cylindrical in shape, slightly longer than the distance between the transverse baffle 250 and the buffer plate 300) is welded to the side wall of the buffer plate 300. The other end of the sliding rod 330 passes through the limiting hole 270 and is welded with a second limiting plate 340 (circular in shape, with a diameter larger than the diameter of the limiting hole 270). The innovation of this structure lies in the precise limitation of the maximum movement distance of the buffer plate through the cooperation of the sliding rod and the limiting hole, and the blocking effect of the limiting plate. This solves the problems of spring over-compression leading to elastic failure or the buffer plate being too close to the baffle 240 causing structural interference. When the sliding rod 330 slides along the limiting hole 270, the second limiting plate 340 can abut against the limiting plate 260 when the buffer plate moves to its limit position, preventing it from moving further.

[0038] Technical Effect: The cooperation between the slide rod 330 and the limiting hole 270 ensures that the buffer plate 300 always moves in a straight line during the buffering process, avoiding jamming or displacement due to uneven deformation of the spring 320. The diameter of the second limiting plate 340 is larger than that of the limiting hole 270. When the buffer plate 300 moves to the maximum distance towards the baffle 240 (when the spring 320 is compressed to its safe limit), the second limiting plate 340 abuts against the limiting plate 260, preventing the spring 320 from being over-compressed and losing its elasticity or being damaged, while also preventing direct collision between the buffer plate 300 and the baffle 240. This limiting function ensures that the buffer structure always operates within a safe range, ensuring the stability and consistency of the buffering effect, and further improving the reliability and service life of the device.

[0039] Specifically, a comparison of relevant test data and practical application data for this solution.

[0040] Data Description Continuous traction 100-times detachment rate: Under the same road conditions (asphalt road surface, including a 500-meter bumpy section) and the same traction weight (2 tons), the conventional trailer hook and this device were each tested 100 times, and the percentage of times detachment (complete separation of the screw from the screw hole) was counted.

[0041] Stability of the pallet unfolding / retracting: Test the pallet unfolding and retracting process 100 times, and count the percentage of times the pallet has no obvious displacement (displacement <1mm).

[0042] Impact force on the frame during detachment: The average impact force at the contact point between the frame and the device (or conventional trailer hitch) during simulated detachment is measured by sensors.

[0043] Device lifespan: The average time it takes for the device to experience structural damage (such as screw breakage or plate deformation) under a frequency of 2 hours of daily use.

[0044] Data Validity Sufficient experimental sample size: Each test group used 10 traditional trailer hooks of the same specifications and 10 devices of this utility model, and the average value was taken to reduce the influence of individual differences.

[0045] The experimental conditions were kept consistent: the test vehicle, traction weight, road conditions, and operating procedures were all kept consistent to ensure the comparability of the data.

[0046] Precise measuring tools: Impact force is measured by a pressure sensor with an accuracy of 0.1kN, and offset is measured by a laser displacement sensor with an accuracy of 0.01mm, ensuring high data accuracy.

[0047] Data repeatability: The data deviation was less than 5% when the test was repeated 3 times under the same conditions, indicating that the data has good repeatability and reliability.

[0048] Working Principle: This solution primarily utilizes a collaborative mechanism of "main fixing + auxiliary fixing + buffer protection" to prevent the tow hook from detaching. First, the screw on the rear wall of the fixing plate connects to the dedicated screw hole of the vehicle trailer hook, forming the main fixing structure between the trailer hook and the vehicle. The connecting rod transmits the force of the trailer hook to the fixing plate and the screw, ensuring a basic connection during towing. Second, the horizontal plates at the top and bottom of the fixing plate, the threaded rods, and the motor constitute the drive system. After the motor starts, it drives the threaded rods to rotate. Because the two ends of the threaded rods have opposite thread directions, the two mating slides (mounted on the clamping plate) move the clamping plate away from each other along the guide rod (through the guide hole in the slide), causing the baffle and buffer plate at the end of the clamping plate to abut against the vehicle frame, forming auxiliary fixing. When the screw and screw hole become loose, the abutment between the clamping plate and the frame prevents the trailer hook from detaching entirely. Finally, when the trailer hitch tends to detach and generates an impact force, the rubber pad on the buffer plate first contacts the frame for initial cushioning. Then, the spring absorbs the impact force through compression, while the slide bar slides along the limiting hole. The limiting plate restricts the movement range of the buffer plate, ensuring the stable operation of the buffer structure and reducing impact damage.

[0049] Technical benefits of implementing this solution: After implementation, the safety and reliability of the towing hook are significantly improved. Regarding anti-detachment, the dual protection of the main screw fixation and the auxiliary fixation of the clamping plate effectively solves the problem of existing towing hooks relying solely on screw fixation, which are prone to loosening and detachment due to vibration and uneven force. Actual testing shows that the detachment rate of the towing hook is reduced by more than 90%, significantly reducing safety accidents caused by hook detachment during towing. In terms of operational stability, the cooperation between the guide rod and guide hole ensures smooth movement of the clamping plate, avoiding jamming or offset, making the contact between the clamping plate and the vehicle frame more precise, and improving the reliability of auxiliary fixation by 80%. Regarding cushioning protection, the dual cushioning structure of rubber pads and springs reduces the impact force when the towing hook detaches by 60%-70%, effectively protecting the vehicle frame and the device's own structure, reducing maintenance costs caused by impacts. Furthermore, the limiting structure ensures that the cushioning system always operates within a safe range, improving the stability of the cushioning effect by 75% and extending the device's service life (3-5 years longer than traditional towing hooks). Overall, this solution comprehensively addresses the pain points of existing trailer hitches and has high practical value.

[0050] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A locking device for preventing the hook from falling off a tractor, characterized in that, include: A fixed plate (100) is a rectangular plate structure. A trailer hook (110) is provided on the front side wall of the fixed plate (100). The trailer hook (110) is annular. A connecting rod (120) is provided on the outer wall of the trailer hook (110). The front end of the connecting rod (120) is welded to the outer wall of the trailer hook (110), and the tail end of the connecting rod (120) is welded to the front side wall of the fixed plate (100) and located at the center of the front side wall of the fixed plate (100). A screw is welded to the rear side wall of the fixed plate (100). (130), the screw (130) is coaxial with the connecting rod (120), and the top and bottom of the fixing plate (100) are both equipped with horizontal plates (140). The two horizontal plates (140) are symmetrically located on the front side wall of the fixing plate (100). A positive and negative thread rod (150) is rotatably connected between the two horizontal plates (140). A motor (160) is installed on the top of the upper horizontal plate (140). The output end of the motor (160) extends between the two horizontal plates (140) and is connected to the positive and negative thread rod (150). The clamping plate (200) consists of two symmetrically located on the front side wall of the fixing plate (100). The connecting rod (120) is located between the two clamping plates (200). Each of the two clamping plates (200) has a sliding plate (210) installed on a section close to each other. The top of the sliding plate (210) has a threaded hole (220). The positive and negative threaded rod (150) rotates through the threaded hole (220).

2. The anti-detachment locking device for a tractor hook according to claim 1, characterized in that, A guide rod (170) is installed between the two horizontal plates (140), and a guide hole (230) is provided on the top of the slide plate (210), through which the guide rod (170) passes.

3. The anti-detachment locking device for a tractor hook according to claim 2, characterized in that, A baffle (240) is installed at one end of each of the two card plates (200) that are far apart from each other.

4. The anti-detachment locking device for a tractor hook according to claim 3, characterized in that, It also includes a buffer plate (300), which is located on the side wall of the baffle (240). A rubber pad (310) is installed on the side wall of the buffer plate (300), and a spring (320) is installed on the other side wall of the buffer plate (300). The other end of the spring (320) abuts against the side wall of the baffle (240).

5. The anti-detachment locking device for a tractor hook according to claim 4, characterized in that, A transverse baffle (250) is installed on the side wall of the baffle (240), and a limiting plate (260) is installed at the other end of the transverse baffle (250). A limiting hole (270) is opened on the side wall of the limiting plate (260).

6. The anti-detachment locking device for a tractor hook according to claim 5, characterized in that, The buffer plate (300) is equipped with a slide rod (330) on its side wall. The other end of the slide rod (330) passes through the limiting hole (270) and is equipped with a second limiting plate (340). The diameter of the second limiting plate (340) is larger than the diameter of the limiting hole (270).

Images