Locking device and method for rear door of container of self-discharging trailer

Abstract

The invention provides a self-discharging trailer container rear door locking device and method, and belongs to the technical field of self-discharging trailers, the self-discharging trailer container rear door locking device comprises a locking handle and a locking mechanism matched with the locking handle, the locking handle is rotationally connected to the two side walls of a container body, a locking hook is arranged on the locking handle, and the locking mechanism is connected with the locking handle. The locking mechanism comprises a locking seat, the locking seat is welded and fixed to the container body at the bottom of the container rear door, a limiting pin is arranged at the bottom of the container rear door, and the lock hook and the locking seat are both matched with the limiting pin. Bumping and vibration in the vehicle running process can be effectively resisted, and it is ensured that the cargo tank rear door is always kept in a reliable locking state.

Description

Technical Field

[0001] The present invention belongs to the technical field of dump trailers, and in particular relates to a device and method for locking a rear door of a dump trailer cargo box. Background Art

[0002] Dump trucks, also known as tipping trucks, consist of a vehicle body and a cargo box. The cargo box is installed on the vehicle body in a flippable manner. Automatic unloading can be achieved by driving the cargo box to flip through a hydraulic lifting system. They are widely used in engineering construction, agricultural logistics and other fields.

[0003] The rear of the cargo box is equipped with a rear door, which is pivotally connected to the cargo box. When not unloading, the rear door remains closed. During unloading, the rear door opens. The rear door must remain securely locked during transportation to prevent spillage or accidental detachment.

[0004] Traditional dump truck rear door locking devices all use a double-lock hook structure, that is, two lock hooks are installed on both sides of the rear door, which are used to hook the cargo box rear door and lock it. However, the vehicle is prone to bumps and vibrations during driving, causing the cargo box rear door to shake and become unhooked, making it impossible to ensure that the cargo box rear door always remains reliably locked. Summary of the Invention

[0005] In response to the defects or shortcomings in the prior art, the present invention provides a locking device and method for the rear door of a dump trailer cargo box, which can effectively resist bumps and vibrations during vehicle driving and ensure that the rear door of the cargo box always remains in a reliably locked state.

[0006] To achieve the above object, the present invention adopts the following technical solutions: In the first aspect, an embodiment of the present invention provides a locking device for the rear door of a dump trailer cargo box, comprising a locking handle and a locking mechanism matched therewith, wherein the locking handle is rotatably connected to the side walls on both sides of the cargo box body, the locking handle is provided with a locking hook, and the locking mechanism includes a locking seat, which is welded and fixed to the cargo box body at the bottom of the cargo box rear door, and a limit pin is provided at the bottom of the cargo box rear door, and the locking hook and the arc-shaped inner concave surface are both adapted to the limit pin.

[0007] Furthermore, the locking handle is overall in an "L" shape, including a vertically arranged operating portion and a horizontally arranged locking portion, and the bottom end of the operating portion is bent inward and connected to the locking portion.

[0008] Furthermore, the locking hook is arranged at an end of the locking portion away from the operating portion, the top of the locking hook is arc-shaped, and the bottom is provided with an opening.

[0009] Furthermore, an arc-shaped inner concave surface is provided on the upper portion of the locking seat, and the arc-shaped inner concave surface is adapted to the limiting pin.

[0010] Furthermore, one end of the limit pin close to the locking handle protrudes from the side wall of the rear door of the cargo box and is arranged corresponding to the lock hook.

[0011] Furthermore, the locking mechanism also includes a support seat, which is a circular pin shaft, one end of which is welded and fixed to the side wall of the cargo box body.

[0012] Furthermore, a fixing hole is provided at one end of the locking portion close to the operating portion, and the fixing hole is adapted to the support seat.

[0013] Furthermore, a locking pin hole is provided at one end of the locking portion away from the operating portion. The locking pin hole is located below the lock hook, corresponds to the positioning hole on the cargo box body, and a locking pin is inserted into the locking pin hole.

[0014] Furthermore, a limit pull ring is provided on the side wall of the cargo box body, and the limit pull ring is welded and fixed to one side of the top end of the locking handle operating part.

[0015] In a second aspect, an embodiment of the present invention provides a method for locking a dump trailer cargo box rear door, using the dump trailer cargo box rear door locking device as described above, comprising the following steps: When the rear door of the cargo box needs to be closed, close the rear door of the cargo box, place the limit pin on the arc-shaped inner concave surface of the locking seat, rotate the locking handle clockwise, hook the limit pin with the lock hook, and use the lock hook and the locking seat to fix the limit pin to achieve a fixed connection between the rear door of the cargo box and the cargo box body, and insert the locking pin into the locking pin hole and the positioning hole of the cargo box body to prevent the locking handle from rotating under vibration and causing disengagement; When the rear door of the cargo box needs to be opened, pull out the locking pin from the locking pin hole and the positioning hole of the cargo box body, rotate the locking handle counterclockwise, and the lock hook will move away from the limit pin. The bottom of the rear door of the cargo box can be opened to achieve the top-up opening of the rear door of the cargo box. Put the top of the locking handle operating part into the limit pull ring to fix the rotation angle of the locking handle to prevent the locking handle from rotating and interfering with the opening and closing of the rear door of the cargo box.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention rotates and connects a locking handle on the side wall of the cargo box body, and provides a lock hook on the locking handle. At the same time, a locking seat is provided on the cargo box body at the bottom of the cargo box rear door, and a limit pin is provided at the bottom of the cargo box rear door. The lock hook and the locking seat are both adapted to the limit pin. When the cargo box rear door is closed, the limit pin is placed on the locking seat, and the lock hook hooks the limit pin from above. The lock seat supports the limit pin to prevent the cargo box rear door from shaking when the vehicle is bumpy or vibrating during driving, thereby preventing the cargo box rear door from being unhooked and unable to ensure that the cargo box rear door always remains in a reliably locked state.

[0017] 2. The present invention provides a locking pin hole on the locking handle, which corresponds to the positioning hole on the cargo box body. By inserting the locking pin into the locking pin hole and the positioning hole, the locking handle is locked, effectively preventing loosening and slipping, thereby playing a role of multiple protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram showing the position relationship between the cargo box and the locking device in the first embodiment of the present invention; Figure 2 This is a structural diagram of a locking handle in Embodiment 1 of the present invention; Figure 3 This is a schematic diagram of the locking mechanism in Example 1 of the present invention; Figure 4 This is a diagram showing the locking handle in the open state in the first embodiment of the present invention; Figure 5 This is a diagram of the cargo box rear door flipped up in the first embodiment of the present invention; Figure 6 This is a diagram of the cargo box rear door in the downward folded state in the first embodiment of the present invention; Among them, 1. Locking handle; 101. Operating part; 102. Locking part; 103. Lock hook; 104. Fixing hole; 105. Locking pin hole; 2. Cargo box body; 3. Cargo box rear door; 4. Support seat; 5. Locking seat; 6. Limit pin; 7. Locking pin; 8. Limit pull ring. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Example 1 A typical embodiment of the present invention is as follows Figure 1 As shown, a locking device for the rear door of a dump trailer cargo box includes a locking handle 1 and a locking mechanism that cooperates therewith. There are two locking handles 1 and two locking mechanisms. The two locking handles 1 are rotatably connected to the side walls of the cargo box body 2, and the two locking mechanisms are respectively arranged corresponding to the two locking handles 1.

[0021] like Figure 2 As shown, the locking handle 1 is overall in an "L" shape, including a vertically arranged operating portion 101 and a horizontally arranged locking portion 102. The surface of the operating portion 101 is provided with an anti-slip texture to facilitate the operator to hold and apply force, and prevent slipping due to sweating of the hands and other reasons, which affects the smoothness of operation.

[0022] The bottom end of the operating part 101 is bent inward and connected to the locking part 102, so that the operating part 101 and the locking part 102 are no longer in the same plane. When the locking handle 1 is connected to the cargo box body 2, the locking part 102 is close to the side wall of the cargo box body 2, and the operating part 101 is separated from the side wall of the cargo box body 2 by a set distance, so that it is convenient for the operator to hold the operating part 101 and operate the locking handle 1.

[0023] A lock hook 103 is provided at one end of the locking portion 102 away from the operating portion 101. The top of the lock hook 103 is arc-shaped and the bottom is provided with an opening. By providing the lock hook 103, it can cooperate with the locking mechanism provided on the rear door 3 of the cargo box to achieve locking and fixing of the rear door 3 of the cargo box.

[0024] Specifically, the locking structure includes a support seat 4 and a locking seat 5, such as Figure 3 As shown, the support seat 4 is a circular pin shaft, one end of which is welded and fixed to the side wall of the cargo box body 2, and a fixing hole 104 is provided at the end of the locking portion 102 close to the operating portion 101, and the fixing hole 104 is adapted to the support seat 4, and the support seat 4 can be inserted into the fixing hole 104, and a pin hole is opened and closed at the end of the support seat 4 away from the cargo box body 2, and the axis of the pin hole is perpendicular to the axis of the support seat 4, and an O-shaped pin shaft is inserted in the pin hole. By setting the O-shaped pin shaft, the locking handle 1 can be effectively prevented from moving out of the support range of the support seat 4.

[0025] The fixing hole 104 and the support seat 4 are clearance-fitted, so that the locking handle 1 can rotate around the support seat 4, thereby realizing a rotational connection between the locking handle 1 and the side wall of the cargo box body 2. At the same time, there is a certain damping effect between the fixing hole 104 and the support seat 4, so that the locking handle 1 will not suddenly fall due to the action of gravity when the locking handle 1 is rotated.

[0026] like Figure 5 When the cam 1 is unlocked, the locking handle 1 is rotated clockwise to hook the end of the limit pin 6 and fix the limit pin 6 on the locking seat 5, thereby achieving the locking and fixing of the cargo box rear door 3.

[0027] The arc-shaped inner concave surface of the locking seat 5 is adapted to the lock hook 103 on the locking handle 1, ensuring that the contact area with the limit pin 6 is large enough when the two are combined, the force is evenly distributed, and the reliability of the locking is improved.

[0028] A locking pin hole 105 is also provided at the end of the locking portion 102 away from the operating portion 101. The locking pin hole 105 is located below the lock hook 103. A locking pin 7 is inserted into the locking pin hole 105. When the rear door 3 of the cargo box is locked and fixed using the locking handle 1, the locking pin hole 105 corresponds to the positioning hole on the cargo box body 2. By inserting the locking pin 7 into the locking pin hole 105 and the positioning hole, the locking handle 1 is locked, which effectively prevents loosening and slipping, thereby playing a role of multiple protection.

[0029] A limit pull ring 8 is also provided on the side wall of the cargo box body 2. The limit pull ring 8 is welded and fixed to one side of the top of the operating part 101 of the locking handle 1. When the locking handle 1 is rotated counterclockwise, the limit pull ring 8 can be sleeved on the top of the operating part 101 of the locking handle 1, so that when the locking handle 1 is out of the locking seat 5, it can be accurately fixed at the required rotation angle.

[0030] In order to ensure that the rotation of the lock hook 103 does not interfere with the opening and closing of the cargo box rear door 3, it is necessary to determine the distance between the axis of the support base 4 and the center point of the lock hook 103 so that the rotation angle of the locking handle 1 and the opening and closing distance are unified.

[0031] like Figure 4 As shown, assuming that the distance moved between the locked state and the unlocked state of the lock hook 103 is L, and the rotation angle between the locked state and the unlocked state of the lock handle 1 is θ, according to the geometric relationship, the distance d between the axis of the support base 4 and the center point of the lock hook 103 can be expressed as:

[0032] For example, the rotation angle θ between the locking state and the unlocking state of the locking handle 1 is 30°, and the distance L between the locking state and the unlocking state of the lock hook 103 is 40 mm. Then, the distance between the axis of the support base 4 and the center point of the lock hook 103 is , through the distance between the axis of the support seat 4 and the center point of the lock hook 103, it is ensured that the locking handle 1 can be accurately rotated between the locked and unlocked states, thereby achieving a reliable locking function.

[0033] Furthermore, the rear door locking device provided by the present invention can realize multiple opening and closing modes of the cargo box rear door 3. When the cargo box rear door 3 needs to be closed, Figure 1As shown, the cargo box rear door 3 is closed, the limit pin 6 is placed on the arc-shaped inner concave surface of the locking seat 5, the locking handle 1 is rotated clockwise, the limit pin 6 is hooked by the locking hook 103, and the limit pin 6 is fixed by the locking hook 103 and the locking seat 5, thereby realizing a fixed connection between the cargo box rear door 3 and the cargo box body 2, and the locking pin 7 is inserted into the locking pin hole 105 and the positioning hole of the cargo box body 2 to prevent the locking handle 1 from rotating under vibration and causing disengagement, thereby further ensuring the reliability of the locking of the cargo box rear door 3.

[0034] When the cargo box rear door 3 needs to be opened, Figure 5 As shown, the locking pin 7 is pulled out from the locking pin hole 105 and the positioning hole of the cargo box body 2, and the locking handle 1 is rotated counterclockwise, and the lock hook 103 is away from the limit pin 6, so that the bottom of the cargo box rear door 3 can be opened, and the cargo box rear door 3 can be flipped open to facilitate unloading. The top end of the locking handle 1 operating part 101 is sleeved in the limit pull ring 8 to fix the rotation angle of the locking handle 1 to prevent the locking handle 1 from rotating and interfering with the opening and closing of the cargo box rear door 3.

[0035] When the cargo box rear door 3 needs to be opened, Figure 6 As shown, the locking handle 1 is kept in the locked state of the cargo box rear door 3, and the top lock pin of the cargo box rear door 3 is removed. Since the limit pin 6 is welded to both sides of the bottom of the cargo box rear door 3, with the limit pin 6 as the rotation axis, the lock hook 103 of the locking handle 1 and the arc-shaped inner concave surface on the locking seat 5 are combined to form an axis hole, and the cargo box rear door 3 rotates around the limit pin 6 to realize the downward flipping and opening of the cargo box, which is convenient for cleaning the cargo box. The locking pin 7 is inserted into the locking pin hole 105 and the positioning hole of the cargo box body 2, which avoids the locking handle 1 from rotating when the cargo box rear door 3 is flipped down, thereby ensuring the reliability of the connection.

[0036] Example 2 This embodiment provides a method for locking the rear door of a dump trailer cargo box, using the dump trailer cargo box rear door locking device as described in Example 1, including the following steps: When the rear door of the cargo box needs to be closed, the rear door of the cargo box is closed, the limit pin is placed on the arc-shaped inner concave surface of the locking seat, and the locking handle is rotated clockwise to hook the limit pin through the lock hook. The limit pin is fixed by the lock hook and the locking seat, thereby achieving a fixed connection between the rear door of the cargo box and the cargo box body. The locking pin is inserted into the locking pin hole and the positioning hole of the cargo box body to prevent the locking handle from rotating under vibration and causing disengagement, thereby further ensuring the reliability of the locking of the cargo box door. When the rear door of the cargo box needs to be opened, pull out the locking pin from the locking pin hole and the positioning hole of the cargo box body, rotate the locking handle counterclockwise, and the lock hook will move away from the limit pin, so that the bottom of the rear door of the cargo box can be opened, and the rear door of the cargo box can be flipped open to facilitate unloading. The top of the locking handle operating part is placed in the limit pull ring to fix the rotation angle of the locking handle to prevent the locking handle from rotating and interfering with the opening and closing of the rear door of the cargo box.

[0037] By rotating the locking handle on the side wall of the cargo box body, and arranging a lock hook on the locking handle, a locking seat is arranged on the cargo box body at the bottom of the cargo box rear door, and a limit pin is arranged at the bottom of the cargo box rear door, and the lock hook and the locking seat are adapted to the limit pin. When the cargo box rear door is closed, the limit pin is placed on the locking seat, and the lock hook hooks the limit pin from above, and the locking seat is used to support the limit pin to prevent the cargo box rear door from shaking when the vehicle is bumpy or vibrating during driving, thereby preventing the cargo box rear door from being unhooked, and it is impossible to ensure that the cargo box rear door always remains in a reliably locked state.

[0038] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A dump trailer cargo box rear door locking device, characterized in that: It includes a locking handle and a locking mechanism that matches it. The locking handle is rotatably connected to the side walls on both sides of the cargo box body. The locking handle is provided with a locking hook. The locking mechanism includes a locking seat. The locking seat is welded and fixed to the cargo box body at the bottom of the cargo box rear door. A limit pin is provided at the bottom of the cargo box rear door, and the lock hook and the locking seat are both adapted to the limit pin.

2. The rear door locking device of a dump trailer cargo box according to claim 1, characterized in that: The locking handle is in an "L" shape as a whole, including a vertically arranged operating portion and a horizontally arranged locking portion, and the bottom end of the operating portion is bent inward and connected to the locking portion.

3. The rear door locking device of a dump trailer cargo box according to claim 2, characterized in that: The lock hook is arranged at one end of the locking portion away from the operating portion, the top of the lock hook is arc-shaped, and the bottom is provided with an opening.

4. The rear door locking device of a dump trailer cargo box according to claim 1, characterized in that: An arc-shaped inner concave surface is provided on the upper portion of the locking seat, and the arc-shaped inner concave surface is adapted to the limiting pin.

5. The rear door locking device of a dump trailer cargo box according to claim 1, characterized in that: One end of the limit pin close to the locking handle protrudes from the side wall of the rear door of the cargo box and is arranged corresponding to the lock hook.

6. The rear door locking device of a dump trailer cargo box according to claim 2, characterized in that: The locking mechanism also includes a support seat, which is a circular pin shaft, one end of which is welded and fixed to the side wall of the cargo box body.

7. The rear door locking device of a dump trailer cargo box according to claim 6, characterized in that: One end of the locking portion close to the operating portion is provided with a fixing hole, which is adapted to the supporting seat.

8. The rear door locking device of a dump trailer cargo box according to claim 2, characterized in that: A locking pin hole is further provided at one end of the locking portion away from the operating portion. The locking pin hole is located below the lock hook, corresponds to the positioning hole on the cargo box body, and a locking pin is inserted into the locking pin hole.

9. The rear door locking device of a dump trailer cargo box according to claim 2, characterized in that: A limit pull ring is also provided on the side wall of the cargo box body, and the limit pull ring is welded and fixed to one side of the top end of the locking handle operating part.

10. A method for locking a dump trailer cargo box rear door, using a dump trailer cargo box rear door locking device according to any one of claims 1 to 9, characterized in that: The following steps are involved: When the rear door of the cargo box needs to be closed, close the rear door of the cargo box, place the limit pin on the arc-shaped inner concave surface of the locking seat, rotate the locking handle clockwise, hook the limit pin with the lock hook, and use the lock hook and the locking seat to fix the limit pin to achieve a fixed connection between the rear door of the cargo box and the cargo box body, and insert the locking pin into the locking pin hole and the positioning hole of the cargo box body to prevent the locking handle from rotating under vibration and causing disengagement; When the rear door of the cargo box needs to be opened, pull out the locking pin from the locking pin hole and the positioning hole of the cargo box body, rotate the locking handle counterclockwise, the lock hook moves away from the limit pin, open the bottom of the cargo box rear door, and realize the top flip opening of the cargo box rear door, put the top of the locking handle operating part into the limit pull ring, fix the rotation angle of the locking handle, and prevent the locking handle from rotating and interfering with the opening and closing of the cargo box rear door.

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