A self-unloading vehicle carriage rear door locking mechanism

Abstract

The present application relates to a kind of self-unloading vehicle compartment rear door locking mechanism, the rear end of compartment is provided with rear door, the upper edge of rear end port is rotatably connected with the upper edge of rear door, rear door locking mechanism includes two upper supports, two lower supports corresponding with two upper supports, the upper support is rotatably connected with the hook pivot, first telescopic rod is arranged between the front end of hook and lower support, the end of hook limiting block away from upper support is provided with limiting concave ring, two grooves are symmetrically arranged on the outer edge of limiting concave ring, positioning cylinder is rotatably sleeved on the upper hook limiting block, two slide rods are slidably connected on the positioning cylinder, and lock rod is fixed on the lower end of slide rod, the present application utilizes the oil pressure of hydraulic oil to promote the telescopic of first telescopic rod and second telescopic rod, utilizes the limiting effect of lock rod, prevents the swing of hook when rear door is closed, avoids that first telescopic rod keeps working state for a long time, reduces the work burden of first telescopic rod, and simultaneously improves the security of locking mechanism.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of damping devices, and particularly relates to a self-unloading vehicle carriage rear door locking mechanism. BACKGROUND

[0002] The self-unloading vehicle is widely used in highway construction, urban infrastructure construction, real estate development and other constructions as the main tool for transporting building materials, earthwork and the like due to simple structure and high transportation efficiency, thereby being rapidly developed. The existing self-unloading vehicles are all equipped with rear door locking devices. However, the existing rear door locking devices need to be additionally powered to be locked and opened, and the locking force is not enough. After being used for a long time, the rear door is prone to leaking in the transportation process, which seriously interferes with the driving of other vehicles and affects the road tidiness and city image.

[0003] A self-unloading vehicle rear door locking device disclosed in Chinese Patent No. 201921616440.4 uses the extension and retraction of the telescopic rod to fix the lock hook, thereby realizing the locking and fixing of the rear door. However, in order to firmly fix the rear door, the telescopic rod needs to always bear the reaction force of the lock hook after the rear door is closed. After being used for a long time, the telescopic rod is subjected to a large burden, and the hydraulic oil in the telescopic rod is prone to leakage, thereby causing the rear door to be loose.

[0004] In view of the deficiencies in the prior art, further improvement is needed. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a self-unloading vehicle carriage rear door locking mechanism to solve the above problems.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a self-unloading vehicle carriage rear door locking mechanism, wherein the carriage bottom plate of the self-unloading vehicle is rotationally connected to the vehicle frame through a turnover shaft at a position close to the tail part, a rear door is arranged at the rear end of the carriage, and the upper edge of the rear end port is rotationally connected to the upper edge of the rear door. The rear door locking mechanism comprises two upper supports, two lower supports corresponding to the two upper supports, the upper supports are symmetrically fixed and installed at the tail part of the carriage bottom plate, the lower supports are symmetrically fixed and installed at the tail part of the vehicle frame, a lock hook shaft is rotationally connected to the upper support, a cylindrical lock hook limiting block is fixed on the lock hook shaft, a lock hook is fixed on the lock hook limiting block, the rear end of the lock hook is a curved hook head for hooking the lower edge of the rear door to lock and fix the rear door, a first telescopic rod is arranged between the front end of the lock hook and the lower support, the bottom end of the first telescopic rod is hingedly connected to the front end of the lock hook, and the elongated end of the first telescopic rod is hingedly connected to the lower support.

[0007] The end, away from the upper support, of the locking hook limiting block is provided with a limiting concave ring, the outer edge of the limiting concave ring is symmetrically provided with two grooves, a positioning cylinder is rotatably connected to the locking hook limiting block, two connecting rods are symmetrically arranged between the positioning cylinder and the upper support, one end of the connecting rod is fixedly connected with the positioning cylinder, the other end of the connecting rod is fixedly connected with the upper support, two slide rods are slidably connected to the positioning cylinder, the lower ends of the two slide rods are located at the front side of the limiting concave ring, a locking rod is fixedly connected to the lower end of the slide rod and inserted into the limiting concave ring, a limiting baffle is fixedly connected to the upper end of the slide rod, a spring is sleeved on the slide rod, one end of the spring is fixedly connected with the positioning cylinder, and the other end of the spring is fixedly connected with the limiting baffle, a push-pull plate is arranged on the side, away from the upper support, of the positioning cylinder, the edge of the push-pull plate is bent towards the side close to the limiting baffle, a second telescopic rod is arranged between the push-pull plate and the positioning cylinder, the bottom end of the second telescopic rod is fixedly connected with the positioning cylinder, and the elongated end of the second telescopic rod is fixedly connected with the push-pull plate, a swing rod is arranged between the push-pull plate and the limiting baffle, one end of the swing rod is hingedly connected with the limiting baffle, and the other end of the swing rod is hingedly connected with the push-pull plate.

[0008] The upper support is fixedly connected with an oil storage tank, the oil storage tank is filled with hydraulic oil, the outlet of the oil storage tank is communicated with the inlet of the first telescopic rod and the second telescopic rod through a pipeline, and the return port of the oil storage tank is communicated with the outlet of the first telescopic rod and the second telescopic rod through a pipeline.

[0009] Preferably, the swing range of the locking hook is located between the two connecting rods.

[0010] The oil storage tank supplies hydraulic oil to the cylinder bodies of the first telescopic rod and the second telescopic rod through the pipeline, the first telescopic rod and the second telescopic rod are driven to extend or retract by the oil pressure of the hydraulic oil, under the action of the pressure relief valve, the hydraulic oil in the oil storage tank first flows to the second telescopic rod, the locking rod slides out of the groove in the outer edge of the limiting concave ring, the unlocking of the locking hook is completed, the oil pressure in the pipeline connected with the first telescopic rod and the second telescopic rod increases, when the oil pressure exceeds the set pressure of the pressure relief valve, the hydraulic oil in the pipeline enters the first telescopic rod, the first telescopic rod is driven to extend, the locking hook is driven to swing clockwise, and the rear door is opened; after the unloading is completed, the locking rod slides along the inner wall of the limiting concave ring until the locking rod slides into the groove in the outer edge of the limiting concave ring, under the action of the spring force, the locking rod is inserted into the groove in the outer edge of the limiting concave ring, the locking hook is locked, the locking rod is used for limiting the locking hook from swinging when the rear door is closed, the first telescopic rod is prevented from being in a long-term working state, the working burden of the first telescopic rod is reduced, and the safety of the locking mechanism is improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is the main structure diagram of the application;

[0012] Figure 2 It is the rear door locking mechanism structure diagram of the application;

[0013] Figure 3 For the invention Figure 2 Cross-sectional state of A-A portion Figure 1 ;

[0014] Figure 4 For the invention Figure 2 Cross-sectional state of A-A portion Figure 2 ;

[0015] Figure 5 For the invention workflow diagram.

[0016] The figure label: 1 car; 2 car frame; 3 turnover shaft; 4 rear door; 5 upper support; 6 lower support; 7 lock hook shaft; 8 lock hook limiting block; 801 limiting concave ring; 9 lock hook; 10 first telescopic rod; 11 positioning cylinder; 12 connecting rod; 13 slide bar; 14 lock rod; 15 limiting baffle; 16 spring; 17 push-pull plate; 18 second telescopic rod; 19 swing lever; 20 oil tank. DETAILED DESCRIPTION

[0017] The invention will be further described in detail below in conjunction with the drawings and specific embodiments:

[0018] As Figures 1-5 shown, a self-unloading truck rear door locking mechanism, wherein the self-unloading truck 1 bottom plate near the tail portion is connected with the self-unloading truck frame 2 through a turnover shaft 3, the rear end of the car 1 is provided with a rear door 4, the upper edge of the rear end of the car 1 is rotatably connected with the upper edge of the rear door 4, the rear door locking mechanism comprises two upper supports 5 and two lower supports 6 corresponding to the two upper supports 5, the upper supports 5 are symmetrically fixed and installed at the tail of the car 1 bottom plate, the lower supports 6 are symmetrically fixed and installed at the tail of the car frame 2, the upper supports 5 are rotatably connected with the lock hook shaft 7, the lock hook shaft 7 is fixed with a cylindrical lock hook limiting block 8, the lock hook limiting block 8 is fixed with a lock hook 9, the rear end of the lock hook 9 is a curved hook head, which is used to hook the lower edge of the rear door 4 to lock and fix the rear door 4, the first telescopic rod 10 is arranged between the front end of the lock hook 9 and the lower support 6, the bottom end of the first telescopic rod 10 is hinged with the front end of the lock hook 9, and the elongated end of the first telescopic rod 10 is hinged with the lower support 6.

[0019] In the embodiment, the locking hook limiting block 8 is provided with a limiting concave ring 801 at the end away from the upper support 5, two grooves are symmetrically arranged on the outer edge of the limiting concave ring 801, a positioning cylinder 11 is rotatably sleeved on the locking hook limiting block 8, two connecting rods 12 are symmetrically arranged between the positioning cylinder 11 and the upper support 5, one end of the connecting rod 12 is fixedly connected with the positioning cylinder 11, the other end of the connecting rod 12 is fixedly connected with the upper support 5, two slide rods 13 are slidably connected on the positioning cylinder 11, the lower end of the slide rod 13 is located in front of the limiting concave ring 801, a lock rod 14 is fixedly connected with the lower end of the slide rod 13 and inserted into the limiting concave ring 801, a limiting baffle 15 is fixedly connected with the upper end of the slide rod 13, a spring 16 is sleeved on the slide rod 13, one end of the spring 16 is fixedly connected with the positioning cylinder 11, the other end of the spring 16 is fixedly connected with the limiting baffle 15, a push-pull plate 17 is arranged on the side of the positioning cylinder 11 away from the upper support 5, the edge of the push-pull plate 17 is bent towards the side close to the limiting baffle 15, a second telescopic rod 18 is arranged between the push-pull plate 17 and the positioning cylinder 11, the bottom end of the second telescopic rod 18 is fixedly connected with the positioning cylinder 11, the elongated end of the second telescopic rod 18 is fixedly connected with the push-pull plate 17, a swing rod 19 is arranged between the push-pull plate 17 and the limiting baffle 15, one end of the swing rod 19 is hingedly connected with the limiting baffle 15, the other end of the swing rod 19 is hingedly connected with the push-pull plate 17.

[0020] In the embodiment, the upper support 5 is fixedly connected with an oil storage tank 20, the oil storage tank 20 is filled with hydraulic oil, the outlet of the oil storage tank 20 is communicated with the inlet of the first telescopic rod 10 and the second telescopic rod 18 through a conduit, the backflow port of the oil storage tank 20 is communicated with the outlet of the first telescopic rod 10 and the second telescopic rod 18 through a conduit, and the inlet of the first telescopic rod 10 is provided with a pressure relief valve.

[0021] In the embodiment, the swing range of the locking hook 9 is between the two connecting rods 12.

[0022] The working principle of the present application: when the carriage 1 of the present application is unloaded by turning back, the oil tank 20 supplies hydraulic oil to the cylinder of the first telescopic rod 10 and the second telescopic rod 18 through the conduit, and the first telescopic rod 10 and the second telescopic rod 18 are pushed to extend by the oil pressure of the hydraulic oil. Under the action of the pressure relief valve, the hydraulic oil in the oil tank 20 first flows to the second telescopic rod 18, pushing the second telescopic rod 18 to extend, and the swing rod 19 swings to compress the spring 16, so that the locking rod 14 slides out of the groove on the outer edge of the limiting concave ring 801. As the hydraulic oil continues to flow out of the oil tank 20, the hydraulic oil pressure in the conduit to the first telescopic rod 10 and the second telescopic rod 18 increases, and when it exceeds the set pressure of the pressure relief valve, the hydraulic oil in the conduit enters the first telescopic rod 10, pushing the first telescopic rod 10 to extend, and driving the locking hook 9 to swing clockwise, so that the locking hook 9 is separated from the rear door 4, and the rear door 4 is opened. After unloading is completed, the oil tank 20 draws hydraulic oil from the drain port in the first telescopic rod 10 and the second telescopic rod 18, and the first telescopic rod 10 and the second telescopic rod 18 are retracted and reset. The locking hook 9 is hooked and fixed by counterclockwise swinging, and at the same time, the locking rod 14 slides along the inner wall of the limiting concave ring 801 until it slides into the groove on the outer edge of the limiting concave ring 801. At the same time, under the action of the spring 16, the locking rod 14 is inserted into the groove on the outer edge of the limiting concave ring 801, locking the locking hook 9. By using the limiting effect of the locking rod 14, the locking hook 9 is prevented from swinging when the rear door 4 is closed, avoiding that the first telescopic rod 10 remains in a working state for a long time, reducing the working burden of the first telescopic rod 10, and improving the safety of the locking mechanism.

[0023] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A self-unloading vehicle compartment rear door locking mechanism, wherein the compartment floor of the self-unloading vehicle is rotatably connected with the frame of the self-unloading vehicle through a turnover shaft near the tail part, the rear end of the compartment is provided with a rear door, and the upper edge of the rear end port of the compartment is rotatably connected with the upper edge of the rear door, the rear door locking mechanism comprising two upper supports, two lower supports corresponding to the two upper supports, the upper supports being fixedly installed at the tail part of the compartment floor and the lower supports being fixedly installed at the tail part of the frame, a lock hook rotating shaft being rotatably connected with the upper support, a cylindrical lock hook limiting block being fixed on the lock hook rotating shaft, a lock hook being fixed on the lock hook limiting block, the rear end of the lock hook being a curved hook head for hooking the lower edge of the rear door to lock and fix the rear door, a first telescopic rod being arranged between the front end of the lock hook and the lower support, the bottom end of the first telescopic rod being hingedly connected with the front end of the lock hook, and the elongated end of the first telescopic rod being hingedly connected with the lower support. An limiting concave ring is arranged at the end of the lock hook limiting block away from the upper support, two grooves are symmetrically arranged on the outer edge of the limiting concave ring, a positioning cylinder is rotatably sleeved on the lock hook limiting block, two connecting rods are symmetrically arranged between the positioning cylinder and the upper support, one end of the connecting rod is fixedly connected with the positioning cylinder, the other end of the connecting rod is fixedly connected with the upper support, two slide rods are slidably connected with the positioning cylinder, the lower ends of the two slide rods are located on the front side of the limiting concave ring, a lock rod is fixed on the lower end of the slide rod and inserted into the limiting concave ring, a limiting baffle is fixed on the upper end of the slide rod, a spring is sleeved on the slide rod, one end of the spring is fixedly connected with the positioning cylinder, the other end of the spring is fixedly connected with the limiting baffle, a push-pull plate is arranged on the side of the positioning cylinder away from the upper support, the edge of the push-pull plate is bent towards the side close to the limiting baffle, a second telescopic rod is arranged between the push-pull plate and the positioning cylinder, the bottom end of the second telescopic rod is fixedly connected with the positioning cylinder, the elongated end of the second telescopic rod is fixedly connected with the push-pull plate, a swing rod is arranged between the push-pull plate and the limiting baffle, one end of the swing rod is hingedly connected with the limiting baffle, and the other end of the swing rod is hingedly connected with the push-pull plate.

2. A lock mechanism for a dump body rear gate as set forth in claim 1, wherein, An oil storage tank is fixed on the upper support, the oil storage tank is filled with hydraulic oil, the liquid outlet of the oil storage tank is communicated with the liquid inlets of the first telescopic rod and the second telescopic rod through a pipeline, the backflow port of the oil storage tank is communicated with the liquid outlets of the first telescopic rod and the second telescopic rod through a pipeline, and a pressure relief valve is arranged at the liquid inlet part of the first telescopic rod.

3. A lock mechanism for a dump body rear gate as set forth in claim 1, wherein, The swing range of the lock hook is between the two connecting rods.

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