A semi-trailer foldable ramp locking device

Abstract

This application relates to the field of cargo transportation equipment technology, specifically a foldable ramp locking device for a semi-trailer. The device includes a ramp support A, a front ramp B, and a rear ramp C. A front hydraulic cylinder and a rear hydraulic cylinder for controlling folding are respectively installed on the front ramp B and rear ramp C. The left end of the front ramp B is hinged to the ramp support A, and the left end of the rear ramp C is hinged to the right end of the front ramp B. A linkage device is rotatably connected to the front end of the outer side of the front ramp B near the rear ramp C. An adjustable hook device is installed at the end of the linkage device. This application achieves rigid mechanical locking in the folded state through the coordinated design of the adjustable hook device and the locking pin device. The hook and the safety locking pin form a physical interlock, which, combined with the fixing pin device and the spherical bearing, effectively prevents the ramp from accidentally unfolding, completely solving the safety hazards in the folded state.

Description

Technical Field

[0001] This application relates to the field of cargo transportation equipment technology, specifically a foldable ramp locking device for a semi-trailer. Background Technology

[0002] Most semi-trailer ramps on the market are one-piece designs, which cannot be segmented or folded. The ramps often have a steep incline, making loading and unloading cargo difficult.

[0003] For oversized and overweight cargo, the steeper the ramp slope, the higher the initial crawling speed and the greater the frictional resistance during loading. At the critical point between climbing and smooth driving, the impact load of the cargo on the chassis platform is also very large. During unloading, due to the steep slope, it is necessary to slow down the descent speed and increase rolling friction to maintain a stable state, so that the ground does not exert a large instantaneous reverse impact force on the cargo and cause damage.

[0004] To avoid the ramp being too long and affecting the vehicle's driving stability and passability, the ramp adopts a foldable structure design. However, the safety and reliability of the ramp when folded up are currently poor. Utility Model Content

[0005] This application provides a locking device for a foldable ramp of a semi-trailer, which can effectively ensure the safety and reliability of the ramp when it is folded up, and can effectively solve the problems in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a foldable ramp locking device for a semi-trailer, comprising a ramp support A, a front ramp B, and a rear ramp C, wherein a front hydraulic cylinder and a rear hydraulic cylinder for controlling their folding are respectively installed on the front ramp B and the rear ramp C, the left end of the front ramp B is hinged to the ramp support A, and the left end of the rear ramp C is hinged to the right end of the front ramp B.

[0007] A linkage device is rotatably connected to the front end of the outer side of the front ramp B near the rear ramp C, and an adjustable hook device is installed at the end of the linkage device.

[0008] The connecting rod assembly includes a nut, an annular sealing plug, a connecting rod holder, a rod body, a bearing mounting seat, a tube cap, and a spherical bearing.

[0009] The adjustable hook device includes a control handle, a hook, and a screw.

[0010] A screw is fitted onto the inner side of the rod, and a nut is provided at the end of the rod. The nut is threadedly connected to the screw and hooked to the end of the screw. A bearing mounting seat is provided at the right end of the rod.

[0011] The right end face of the linkage device is fixed to the outer side of the front ramp B by a fixing pin device, and the left end of the outer side of the ramp support A is provided with a locking pin device for the hook.

[0012] The locking pin device includes a locking pin support seat welded to the outer side of the scaffold support seat A. A safety locking pin is welded to the outer side of the locking pin support seat, and the safety locking pin is correspondingly set with the hook and buckle.

[0013] Preferably, the annular sealing plug and the tube cap are located at the left and right ends of the inner side of the rod, respectively.

[0014] Preferably, the outer side of the front ramp B is provided with a connecting rod holder, and the rod is engaged with the connecting rod holder.

[0015] Preferably, the fixing pin device includes a fixing pin support seat, on which a fixing pin is provided. The fixing pin passes through the mounting hole on the bearing mounting seat, and a baffle is engaged with the outer edge of the fixing pin.

[0016] Preferably, the bearing mounting base is provided with a spherical bearing, and the fixing pin passes through the spherical bearing.

[0017] Preferably, the hook has an operating handle on its outer left side.

[0018] Compared with the prior art, the beneficial effects of this application are:

[0019] 1. This application achieves rigid mechanical locking in the folded state through the coordinated design of the adjustable hook device and the locking pin device; the hook and the safety locking pin form a physical interlock, which, combined with the fixing pin device and the spherical bearing, effectively prevents the plank from being accidentally unfolded and completely solves the safety hazards in the folded state.

[0020] 2. The adjustable hook body device that matches the screw and nut allows for fine adjustment of the hook body position to adapt to the locking requirements under different working conditions and ensure that the locking force is always reliable; the spherical bearing in the bearing mounting seat allows the rod body to deflect within a small range, offsetting stress concentration caused by vehicle bumps or assembly errors and extending the service life of the component. Attached Figure Description

[0021] Figure 1 This is a structural diagram of a semi-trailer trailer with its foldable ramps unfolded.

[0022] Figure 2 for Figure 1 Enlarged view of a portion of point I in the middle;

[0023] Figure 3 This is a schematic diagram of the structure of a semi-trailer trailer with its foldable ramp in the folded state.

[0024] In the diagram: A - Plank support base, B - Front plank, C - Rear plank;

[0025] 1 Locking pin device, 11 Safety locking pin, 12 Locking pin support seat, 2 Adjustable hook device, 21 Operating handle, 22 Hook, 23 Screw, 3 Linkage device, 31 Nut, 32 Annular sealing plug, 33 Linkage bracket, 34 Rod body, 35 Bearing mounting seat, 36 Pipe cap, 37 Spherical bearing, 4 Fixing pin device, 41 Fixing pin, 42 Baffle, 43 Fixing pin support seat, 5 Front hydraulic cylinder, 6 Rear hydraulic cylinder. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] In the description of this application, if directional descriptions are involved, such as "up," "down," "front," "back," "left," "right," etc., indicating directional or positional relationships, they are based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this application and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. When a feature is referred to as "set", "fixed", or "connected" to another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, or connected to the other feature.

[0028] Please see Figure 1-3 This application provides the following technical solution: a foldable ramp locking device for a semi-trailer, including a ramp support A, a front ramp B and a rear ramp C, with a front hydraulic cylinder 5 and a rear hydraulic cylinder 6 respectively installed on the front ramp B and the rear ramp C to control their folding. The left end of the front ramp B is hinged to the ramp support A, and the left end of the rear ramp C is hinged to the right end of the front ramp B.

[0029] A connecting rod device 3 is rotatably connected to the front end of the outer side of the front ramp B near the rear ramp C, and an adjustable hook device 2 is installed at the end of the connecting rod device 3.

[0030] Specifically, the linkage device 3, as a connecting and force-transmitting component, positions the adjustable hook device 2 in a suitable position, ensuring that it can move with the ramp and ultimately reliably hook onto the locking pin device 1. It is the key connection for realizing the locking function in the folded state.

[0031] The connecting rod assembly 3 includes a nut 31, an annular sealing plug 32, a connecting rod holder 33, a rod body 34, a bearing mounting seat 35, a tube cap 36, and a spherical bearing 37.

[0032] The adjustable hook device 2 includes a control handle 21, a hook 22, and a screw 23.

[0033] A screw 23 is sleeved on the inner side of the rod 34, and a nut 31 is provided at the end of the rod 34. The nut 31 is threadedly connected to the screw 23. A hook 22 is welded to the end of the screw 23. A bearing mounting seat 35 is provided at the right end of the rod 34.

[0034] Specifically, the threaded pair of screw 23 and nut 31 provides precise length adjustment capability, enabling hook 22 to be accurately aligned and securely hooked onto safety locking pin 11; bearing mounting base 35 provides a supporting foundation for subsequent rotational connection with fixing pin device 4.

[0035] The right end face of the linkage device 3 is fixed to the outer side of the front jump plate B by the fixing pin device 4, and the left end of the outer side of the jump plate support A is provided with a locking pin device 1 for the hook 22.

[0036] Specifically, the fixing pin device 4 reliably installs the entire locking mechanism on the front ramp B, allowing it to move with the ramp; the locking pin device 1 is fixed to the vehicle body as a fixed anchor point for locking. The two are positioned correspondingly to ensure that when the ramp is folded into place, the hook 22 can accurately and reliably hook the safety locking pin 11, which is the key arrangement for achieving safe locking.

[0037] The locking pin device 1 includes a locking pin support 12 welded to the outer side of the scaffold support A. A safety locking pin 11 is welded to the outer side of the locking pin support 12. The safety locking pin 11 is correspondingly set to be fastened to the hook 22.

[0038] Specifically, the device has a compact and rigid structure. The locking pin support 12 provides a stable mounting base, and the safety locking pin 11 serves as a locking point, forming a direct and rigid mechanical connection with the hook 22 of the adjustable hook device 2. The welding connection method ensures high strength and reliability, effectively preventing the plank from being accidentally unfolded in the folded state or during transportation, and significantly improving safety.

[0039] Furthermore, the annular sealing plug 32 and the cap 36 are located at the left and right ends of the inner side of the rod body 34, respectively.

[0040] Specifically, the annular sealing plug 32 and the tube cap 36 can effectively prevent dust from entering the interior of the rod body 34.

[0041] Furthermore, the outer side of the front ramp B is provided with a connecting rod holder 33, and the rod 34 is engaged with the connecting rod holder 33.

[0042] Specifically, the linkage bracket 33 is fixed to the front ramp B, providing additional support and positioning points for the rod 34 of the linkage device 3. The locking method facilitates the fixation of the position of the rod 34 when the ramp is deployed, while limiting unnecessary shaking or displacement of the rod 34.

[0043] Furthermore, the fixing pin device 4 includes a fixing pin support 43, on which a fixing pin 41 is provided. The fixing pin 41 passes through the mounting hole on the bearing mounting seat 35, and a baffle 42 is engaged on the outer edge of the fixing pin 41.

[0044] Specifically, the fixing pin device 4 enables a reliable hinge connection between the connecting rod device 3 and the front ramp B. The fixing pin 41 is the core pivot, the fixing pin support 43 provides the mounting base, and the baffle 42 is a simple and effective axial limiting component that prevents the fixing pin 41 from accidentally coming out, ensuring the long-term safe and reliable operation of the hinge point.

[0045] Furthermore, the bearing mounting base 35 is provided with a spherical bearing 37, and the fixing pin 41 is disposed through the spherical bearing 37.

[0046] Specifically, the spherical bearing 37 is installed in the bearing mounting seat 35, allowing the connecting rod device 3 to automatically self-align and swing relative to the fixed pin 41 within a certain angle range. This can effectively compensate for manufacturing and installation errors as well as slight deformations or vibrations generated during vehicle operation, avoid excessive stress concentration at the hinge point, and improve the adaptability and service life of the mechanism.

[0047] Furthermore, the hook 22 has an operating handle 21 on the left side of its outer surface.

[0048] Specifically, the operating handle 21 is directly mounted on the hook 22, providing the operator with a convenient and effortless point of force application. By operating the handle 21, the hook 22 can be easily rotated around its axis to achieve engagement or disengagement with the safety locking pin 11, simplifying the locking and unlocking operation process and improving operational efficiency and safety.

[0049] In use: With the ramp extended (loading / unloading cargo): the front hydraulic cylinder 5 extends, controlling the front ramp B to slowly descend; simultaneously, the rear hydraulic cylinder 6 extends, controlling the rear ramp C to open at a uniform speed. When the bottom of the ramp fully contacts the ground, the hydraulic cylinder action ends. At this point, the operating handle 21 places the linkage device 3 into the linkage holder 33, allowing for normal loading and unloading of cargo.

[0050] In the folded state of the scaffold (loading completed or transported): the front and rear hydraulic cylinders retract synchronously, controlling the front scaffold B to stand up and the rear scaffold C to fold. The operating handle engages the hook 22 of the linkage device with the locking pin 11 on the scaffold support A, thus safely locking the foldable scaffold device.

[0051] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foldable ramp locking device for a semi-trailer includes a ramp support A, a front ramp B and a rear ramp C, wherein a front hydraulic cylinder (5) and a rear hydraulic cylinder (6) for controlling their folding are respectively installed on the front ramp B and the rear ramp C, the left end of the front ramp B is hinged to the ramp support A, and the left end of the rear ramp C is hinged to the right end of the front ramp B; Its features are: A linkage device (3) is rotatably connected to the front end of the outer side of the front ramp B near the rear ramp C, and an adjustable hook device (2) is installed at the end of the linkage device (3). The connecting rod assembly (3) includes a nut (31), an annular sealing plug (32), a connecting rod holder (33), a rod body (34), a bearing mounting seat (35), a tube cap (36), and a spherical bearing (37). The adjustable hook device (2) includes a control handle (21), a hook (22) and a screw (23). The inner side of the rod (34) is fitted with a screw (23), and the end of the rod (34) is provided with a nut (31). The nut (31) is threadedly connected to the screw (23), and a hook (22) is welded to the end of the screw (23). The right end of the rod (34) is provided with a bearing mounting seat (35). The right end face of the linkage device (3) is fixed to the outer side of the front jump plate B by the fixing pin device (4), and the left end of the outer side of the jump plate support A is provided with a locking pin device (1) for the hook (22). The locking pin device (1) includes a locking pin support (12) welded to the outer side of the springboard support A. A safety locking pin (11) is welded to the outer side of the locking pin support (12). The safety locking pin (11) is correspondingly set to be fastened to the hook (22).

2. The foldable ramp locking device for a semi-trailer according to claim 1, characterized in that: The annular sealing plug (32) and the cap (36) are located at the left and right ends of the inner side of the rod (34), respectively.

3. The foldable ramp locking device for a semi-trailer according to claim 1, characterized in that: The outer side of the front ramp B is provided with a connecting rod holder (33), and the rod (34) is engaged with the connecting rod holder (33).

4. The foldable ramp locking device for a semi-trailer according to claim 1, characterized in that: The fixing pin device (4) includes a fixing pin support (43), a fixing pin (41) is provided on the fixing pin support (43), the fixing pin (41) passes through the mounting hole on the bearing mounting seat (35), and a baffle (42) is engaged on the outer side edge of the fixing pin (41).

5. The foldable ramp locking device for a semi-trailer according to claim 4, characterized in that: The bearing mounting base (35) is provided with a spherical bearing (37), and a fixing pin (41) is set through the spherical bearing (37).

6. The foldable ramp locking device for a semi-trailer according to claim 1, characterized in that: The hook (22) has an operating handle (21) on the left side of its outer surface.

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