Dumper rear tail door locking device and dumper

Abstract

The dumper rear tail door locking device comprises a shell, one side wall of the shell is fixed to a dumper frame, the left side and the right side of the shell are open, and the interior of the shell is hollow; the rotary fixing seat comprises a shaft and a pull ring fixed at one end of the shaft, the shaft penetrates through the two side walls of the shell and can rotate on the shell, and a through hole is formed in the shaft; one end of the screw penetrates through the through hole in the shaft and is fixed through limiting nuts, the limiting nuts comprise the first limiting nut located on the left side of the through hole and the second limiting nut located on the right side of the through hole, and the other end of the screw is connected with the container through a tail hook assembly; when the container is in a completely falling state or a semi-lifting state, the first limiting nut is in contact and fixed with the left side of the through hole; when the container is in a completely-lifted state, the second limiting nut makes contact with and is fixed to the right side of the through hole. The problem of breakage of the iron chain can be effectively solved, safety accidents caused by rapid descending of a container due to sudden failure of the lifting oil cylinder are prevented, and the whole vehicle backward turning accident caused by excessive lifting is avoided.

Description

Technical Field

[0001] The invention relates to a rear door locking device of a dump truck and the dump truck, belonging to the technical field of vehicle rear door locking. Background Art

[0002] The rear doors of existing dump trucks are mostly locked with iron chains / chain rings, such as an efficient rear door opening and closing mechanism for a mining engineering dump truck (CN201646499U), which includes: a locking plate, a locking plate support, a pin shaft II, a chain ring, a forked adjustment member, an adjusting nut, and a frame connecting seat. The screw portion at the lower end of the forked adjustment member passes through the through hole of the frame connecting seat and is fastened with the adjusting nut. One end of the chain ring is inserted into the circle hole at the upper end of the forked adjustment member, and the other end of the chain ring is hinged to the locking plate through the pin shaft II; the locking plate support is welded to the lower part of the cargo box body of the dump truck, located below the rear door of the cargo box, and the locking plate is hinged to the locking plate support through the pin shaft I. There is also a vehicle trunk tailgate locking system (CN210760404U), which includes a manual power arm, a torque transmission shaft, a connecting lever, a rotating hinge block, an iron chain and a lock hook; two groups of torque transmission shafts are arranged in parallel, and the middle part of the torque transmission shaft is driven and connected by a connecting lever; a manual power arm is radially arranged at one end of the first torque transmission shaft for rotating the torque transmission shaft, and both ends of the second torque transmission shaft are respectively fixedly connected to the rotating hinge blocks, and the two rotating hinge blocks are respectively driven and connected to the lock hook arranged under the tailgate through an iron chain; the rotating hinge block is driven by the second torque transmission shaft to form a self-locking.

[0003] When using the above locking scheme, there are the following problems: 1. The iron chain used to lock the rear tailgate is easy to break. 2. The iron chain frame fixing seat is easy to crack. 3. Lifting the cargo box too far will cause the whole vehicle to roll over. 4. When the cargo box is lifted for maintenance, a sudden failure of the lifting cylinder will cause the cargo box to fall rapidly. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a rear tailgate locking device for a dump truck and a dump truck.

[0005] In order to achieve the above object, the present invention adopts a dump truck tailgate locking device, comprising:

[0006] The shell has one side wall fixed on the frame, and the left and right sides of the shell are open and hollow inside;

[0007] The rotating fixed seat comprises a shaft and a pull ring fixed to one end of the shaft, wherein the shaft passes through two side walls of the housing and can rotate on the housing, and a through hole is opened on the shaft;

[0008] A screw rod, one end of which passes through a through hole on the shaft and is fixed by a limit nut, wherein the limit nut includes a first limit nut located on the left side of the through hole and a second limit nut located on the right side of the through hole, and the other end of the screw rod is connected to the cargo box through a tail hook assembly;

[0009] When the cargo box is in a completely dropped state or a half-lifted state, the first limit nut is fixed in contact with the left side of the through hole; when the cargo box is in a completely lifted state, the second limit nut is fixed in contact with the right side of the through hole.

[0010] In some embodiments, countersunk surfaces are respectively provided on the left and right sides of the through hole.

[0011] In some embodiments, an anti-lateral displacement plate is installed on the shell, and the anti-lateral displacement plate is installed in the pull ring, and both ends of the anti-lateral displacement plate are respectively fixed to the shell.

[0012] In some embodiments, a bottom plate is fixed on the side wall of the shell, the bottom plate is welded to the frame, a rotating hole is opened on the bottom plate, and one end of the shaft passes through the shell and extends into the rotating hole of the bottom plate.

[0013] In some embodiments, the first limiting nut and the second limiting nut each include two nuts.

[0014] In some embodiments, the tail hook assembly includes a tail hook fixing seat fixed on the cargo box, a tail hook hinged to the tail hook fixing seat, and the tail hook is hinged to one end of the screw rod.

[0015] In some embodiments, the tail hook fixing seat and the tail hook are respectively provided with limit blocks.

[0016] In some embodiments, the diameter of the screw is 36 mm.

[0017] In some embodiments, the pull ring is in the shape of a circular ring and is welded on the shaft.

[0018] A second aspect of the present invention further provides a dump truck, on which the dump truck tailgate locking device is installed.

[0019] Compared with the prior art, the locking device for the tailgate of a dump truck of the present invention solves the problems of broken iron chains and cracked iron chain frame fixing seats by replacing the traditional iron chains with screws and changing the frame-welded iron chain fixing seats with assembled rotating fixing seats; the screw is fixed by the first limiting nut to achieve the purpose of the screw holding the cargo box, thus solving the problem of the cargo box falling rapidly due to a sudden failure of the lifting cylinder when the cargo box is lifted for maintenance; the screw is fixed by the second limiting nut to achieve the purpose of the screw holding the cargo box, thus avoiding the accident of the whole vehicle overturning caused by over-lifting of the cargo box. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of the locking device for the rear tailgate of a dump truck of the present invention;

[0022] Figure 2 It is a front view of the installation structure of the rotating fixing seat and the housing of the present invention;

[0023] Figure 3 for Figure 2 Left view of

[0024] Figure 4 for Figure 2 Right view of;

[0025] Figure 5 It is a front view of the rotating fixing seat of the present invention;

[0026] Figure 6 for Figure 5 Left view of

[0027] Figure 7 This is a schematic diagram of the installation structure of the rear tailgate locking device of a dump truck of the present invention (the cargo box is completely dropped);

[0028] Figure 8 It is a schematic diagram of the dump truck of the present invention in a state where the cargo box is fully lifted;

[0029] Fig. 9 It is a schematic diagram of the dump truck of the present invention in a state where the cargo box is half-lifted;

[0030] In the figure: 1, first limiting nut, 2, anti-lateral shift plate, 3, shell, 3-1, bottom plate, 4, rotating fixed seat, 4-1, pull ring, 4-2, shaft, 4-3, through hole, 4-4, countersink, 5, second limiting nut, 6, screw, 7, second rotating shaft, 8, tail hook fixing seat, 8-1, tail hook fixing seat limiting block, 9, tail hook, 9-1, tail hook limiting block, 10, first rotating shaft, 11, articulated shaft, 12, frame, 13, cargo box. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear, the technical solutions of the present application are described in detail below with the help of accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0032] In the description of the present invention, it should be understood that the terms "left", "right", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the protection content of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0033] like Figure 1-Figure 9 As shown, a locking device for the rear door of a dump truck includes a housing 3, a rotating fixing seat 4 and a screw 6;

[0034] One side wall of the housing 3 is fixed on the vehicle frame 12, and the left and right sides of the housing 3 are open, and the interior is hollow, so as to facilitate the installation of the rotating fixing seat 4 and the screw 6;

[0035] The rotating fixed seat 4 includes a shaft 4-2 and a pull ring 4-1 fixed to one end of the shaft 4-2. The shaft 4-2 passes through two side walls of the housing 3 and can rotate on the housing 3. A through hole 4-3 is opened on the shaft 4-2.

[0036] One end of the screw rod 6 passes through the through hole 4-3 on the shaft 4-2 and is fixed by a limit nut, the limit nut includes a first limit nut 1 located on the left side of the through hole 4-3 and a second limit nut 5 located on the right side of the through hole 4-3, the other end of the screw rod 6 is connected to the tail hook assembly, and the tail hook assembly is connected to the cargo box 13; by replacing the traditional iron chain with the screw 6, the frame welded iron chain fixing seat is changed to an assembled rotating fixing seat 4, the problem of iron chain breakage and cracking of the iron chain frame fixing seat is solved;

[0037] When the cargo box 13 is in a completely dropped state or a half-lifted state, the first limiting nut 1 is fixed in contact with the left side of the through hole 4-3; when the cargo box is in a completely lifted state, the second limiting nut 5 is fixed in contact with the right side of the through hole 4-3. The present invention achieves the purpose of the screw rod 6 holding the cargo box 13 through the first limiting nut 1, solving the problem of the cargo box falling rapidly due to a sudden failure of the lifting cylinder when the cargo box is lifted for maintenance; the screw rod 6 is supported by the second limiting nut 5, solving the problem of the whole vehicle overturning accident caused by the cargo box 13 being lifted too far.

[0038] In some embodiments, Figure 5 , Figure 6 As shown, the left and right sides of the through hole 4-3 are respectively provided with countersunk surfaces 4-4, which can increase the contact area between the through hole 4-3 and the first limiting nut 1 and the second limiting nut 2, thereby improving the contact stability between the through hole 4-3 and the limiting nut.

[0039] In some embodiments, Figure 1 , Figure 2 As shown, an anti-lateral displacement plate 2 is installed on the shell 3, and the anti-lateral displacement plate 2 is installed in the pull ring 4-1. The two ends of the anti-lateral displacement plate 2 are fixed to the shell 3 by bolts respectively. The anti-lateral displacement plate 2 can prevent the rotating fixed seat 4 from falling off from the shell 3.

[0040] In some embodiments, Figure 3 , Figure 4 As shown, a bottom plate 3-1 is welded on the side wall of the housing 3, and the bottom plate 3-1 is welded on the frame 12. A rotation hole is opened on the bottom plate 3-1, and one end of the shaft 4-2 passes through the housing 3 and extends into the rotation hole of the bottom plate 3-1. By arranging the bottom plate 3-1 between the housing 3 and the frame 12, the installation stability of the housing 3 on the frame 12 is improved, and the structural strength of the housing 3 is guaranteed. At the same time, the shaft 4-2 can rotate on the housing 3 and the bottom plate 3-1, ensuring that the screw 6, the connection point between the screw 6 and the cargo box 13, and the connection point between the screw 6 and the frame 12 are in the same straight line, thereby improving the stress conditions of each component.

[0041] In some embodiments, Figure 1 , Figure 8 and Fig. 9 As shown, the first limiting nut 1 and the second limiting nut 5 each include two nuts, and the two nuts form a nut anti-reversal structure, thereby improving the installation stability of the first limiting nut 1 and the second limiting nut 5 on the screw rod 6.

[0042] In some embodiments, Figure 1 , Figure 7-Figure 9As shown, the tail hook assembly includes a tail hook fixing seat 8 fixed on the cargo box 13, a tail hook 9 hinged to the tail hook fixing seat 8, and the tail hook 9 is hinged to one end of the screw rod 6. By adjusting the movement of the screw rod 6, the state of the tail hook 9 can be adjusted.

[0043] In some embodiments, Figure 1 As shown, the tail hook fixing seat 8 and the tail hook 9 are respectively provided with limit blocks, and the travel of the tail hook 9 is limited by the tail hook limit block 9-1 and the tail hook fixing seat limit block 8-1 to prevent the tail hook 9 from moving freely and causing deformation of the screw 6.

[0044] In some embodiments, the diameter of the screw 6 is 36 mm. The present invention changes the traditional iron chain into a screw 6, which can effectively avoid the problem of iron chain breakage caused by long-term wear (the diameter of the original iron chain round steel is 20 mm, and the diameter of the screw of the present invention is 36 mm).

[0045] In some embodiments, Figure 3-Figure 5 As shown, the pull ring 4-1 is annular and welded to one end of the shaft 4-2. The pull ring 4-1 is exposed outside the housing 3, and the rotating fixing seat 4 can be easily pulled out from the housing 3 through the pull ring 4-1.

[0046] Finally, the present invention also provides a dump truck, on which the dump truck tailgate locking device is installed.

[0047] During installation, first weld the shell 3 to the frame 12 through the base plate 3-1, and install the rotating fixed seat 4 into the shell 3, so that the rotating fixed seat 4 can rotate freely in the shell 3; after the rotating fixed seat 4 is assembled, fix the anti-lateral displacement plate 2 on the shell 3 by bolts to prevent the rotating fixed seat 4 from falling off, and then hinge the tail hook 9 and the tail hook fixed seat 8 through the second rotating shaft 7, and then hinge the screw 6 equipped with the second limiting nut 5 with the tail hook 9 through the first rotating shaft 10; then insert the screw 6 into the through hole 4-3 of the rotating fixed seat 4, and finally install the first limiting nut 1 on the screw 6.

[0048] like Figure 7 As shown, when the cargo box 13 is in a completely dropped state, the position of the first limiting nut 1 needs to be tightly fixed on the countersunk surface 4-4 on the left side of the through hole 4-3, and at this time, the screw 6 can lock the rear tailgate of the cargo box 13 through the tail hook 9;

[0049] like Fig. 9 As shown, when the cargo box 13 is in a semi-lifted state (vehicle maintenance condition), the position of the first limiting nut 1 is adjusted according to the angle of the cargo box during maintenance, but it is also necessary to ensure that at this maintenance angle, the position of the first limiting nut 1 is tightly fixed on the countersunk surface 4-4 on the left side of the through hole 4-3. At this time, the screw 6 is subjected to tension, which can prevent the cargo box 13 from falling suddenly;

[0050] like Figure 8 As shown, when the cargo box 13 is in a fully lifted state, the position of the second limit nut 5 depends on the maximum lifting angle allowed by the cargo box 13, to ensure that when the cargo box 13 reaches the maximum lifting angle, the position of the second limit nut 5 is tightly fixed on the countersunk surface 4-4 on the right side of the through hole 4-3, so as to prevent the cargo box 13 from continuing to lift, thereby avoiding the accident of the whole vehicle overturning caused by over-lifting of the cargo box.

[0051] The rear tailgate locking device of the dump truck of the present invention adopts a screw rod instead of a traditional iron chain, which can effectively avoid the problem of iron chain breakage caused by long-term wear; when the vehicle needs to be repaired, after the cargo box is lifted to the target angle, the position of the first limit nut can be adjusted to achieve the purpose of the screw rod pulling the cargo box, thereby preventing the safety accident caused by the sudden failure of the lifting cylinder causing the cargo box to fall rapidly. In addition, by adjusting the position of the second limit nut, the screw rod can support the cargo box to prevent further lifting, thereby avoiding the accident of the whole vehicle overturning caused by overlifting.

[0052] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A locking device for a rear door of a dump truck, characterized in that: include: A shell (3), one side wall of which is fixed on the vehicle frame (12), the left and right sides of the shell (3) are open, and the interior is hollow; A rotating fixed seat (4) comprises a shaft (4-2) and a pull ring (4-1) fixed to one end of the shaft (4-2); the shaft (4-2) passes through two side walls of the housing (3) and can rotate on the housing (3); a through hole (4-3) is formed on the shaft (4-2); A screw rod (6), one end of which passes through a through hole (4-3) on the shaft (4-2) and is fixed by a limiting nut, wherein the limiting nut comprises a first limiting nut (1) located on the left side of the through hole (4-3) and a second limiting nut (5) located on the right side of the through hole (4-3), and the other end of the screw rod (6) is connected to the cargo box (13) via a tail hook assembly; When the cargo box (13) is in a completely dropped state or a half-lifted state, the first limiting nut (1) is in contact with and fixed to the left side of the through hole (4-3); when the cargo box is in a completely lifted state, the second limiting nut (5) is in contact with and fixed to the right side of the through hole (4-3).

2. A dump truck tailgate locking device according to claim 1, characterized in that: The left side and the right side of the through hole (4-3) are respectively provided with countersunk surfaces (4-4).

3. The rear door locking device of a dump truck according to claim 1, characterized in that: An anti-lateral shift plate (2) is installed on the shell (3), the anti-lateral shift plate (2) is installed in the pull ring (4-1), and both ends of the anti-lateral shift plate (2) are respectively fixed to the shell (3).

4. The rear door locking device of a dump truck according to claim 1, characterized in that: A bottom plate (3-1) is fixed on the side wall of the shell (3), the bottom plate (3-1) is welded to the frame (12), a rotation hole is opened on the bottom plate (3-1), and one end of the shaft (4-2) passes through the shell (3) and extends into the rotation hole of the bottom plate (3-1).

5. The rear door locking device of a dump truck according to claim 1, characterized in that: The first limiting nut (1) and the second limiting nut (5) each comprise two nuts.

6. The rear door locking device of a dump truck according to claim 1, characterized in that: The tail hook assembly comprises a tail hook fixing seat (8) fixed on the cargo box (13), a tail hook (9) hinged to the tail hook fixing seat (8), and the tail hook (9) is hinged to one end of the screw rod (6).

7. A dump truck tailgate locking device according to claim 6, characterized in that: Limiting blocks are respectively provided on the tail hook fixing seat (8) and the tail hook (9).

8. The rear door locking device of a dump truck according to claim 1, characterized in that: The diameter of the screw (6) is 36 mm.

9. The rear door locking device of a dump truck according to claim 1, characterized in that: The pull ring (4-1) is in a circular ring shape and is welded on the shaft (4-2).

10. A dump truck, characterized in that: The dump truck is equipped with a dump truck tailgate locking device as described in any one of claims 1 to 9.

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