Rear door automatic lock of automatic rear unloading container

Abstract

A rear door automatic lock of an automatic rear unloading cargo box belongs to the field of transport tools, the automatic lock is mounted on the cargo box, and the cargo box comprises a box body, a box frame, a transition frame, a rear door and an automatic lock; wherein the transition frame is mounted between the framework vehicle and the box body and does not turn over during unloading; the automatic lock is installed on the box body and located on the lower portion of the rear door and comprises a lock head, a rear shaft seat, a rear shaft, a middle shaft, a middle shaft seat, a front shaft seat, a lock rod and a rear shaft sleeve. The device has the characteristics of improving the transportation efficiency and reducing the labor intensity.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of transport tools, and particularly relates to an automatic opening and locking device for a rear door of a freight box capable of self-unloading from the rear door during unloading. BACKGROUND

[0002] The freight box is a commonly used transport tool in the field of modern transportation, and has the advantages of large cargo carrying capacity, difficulty in scattering, and simple loading during the process of bulk cargo transportation. However, manual operation is still required during unloading, which reduces the freight efficiency. Therefore, people have invented a freight box with a rear self-unloading function. The current self-unloading freight box generally includes two modes of side self-unloading and rear self-unloading, that is, the freight box is tilted to the side to achieve unloading, or is tilted to the rear to achieve the self-unloading function by relying on the self-weight of the goods. The current rear self-unloading freight box needs to be manually opened at the rear during rear tilting unloading, otherwise, the goods cannot be discharged from the rear when the freight box is tilted to the rear. After unloading is completed, the rear door needs to be manually locked to prevent additional traffic accidents during vehicle operation. In this way, the transportation efficiency is reduced. SUMMARY

[0003] In view of the above-mentioned problems existing in the existing backward self-unloading freight container during unloading, the present application proposes a freight container with backward self-unloading function, which can automatically open the rear door during unloading and automatically lock the rear automatic lock after unloading. The specific technical solution is as follows: a rear door automatic lock of an automatic backward unloading freight container, characterized in that: the automatic lock is installed on the freight container, and the freight container comprises a box body, a box frame, a transition frame, a rear door and an automatic lock; the transition frame is installed between the skeleton vehicle and the box body and is not turned over during unloading; the automatic lock is installed on the box body and located at the lower part of the rear door, and comprises a lock head, a rear shaft seat, a rear shaft, a middle shaft, a middle shaft seat, a front shaft seat, a lock rod and a rear shaft sleeve; the lock head is installed on the lock rod and located on the upper surface of the front end of the lock rod, and connected with the lock rod; the lock rod is installed on the rear shaft sleeve and fixedly connected with the rear shaft sleeve, and can rotate on the rear shaft together with the rear shaft sleeve (or rotate on the rear shaft seat together with the rear shaft); the front end of the lock rod is provided with a long slot or a notch, the width of the notch is greater than or equal to the thickness of the middle shaft seat, and the middle shaft seat can be clamped and moved up and down along the middle shaft seat; the lock rod is lapped on the beam of the skeleton vehicle or the base of the transition frame, and when the box body is turned backward, the lock rod rotates as a whole around the contact point of the lock rod and the skeleton vehicle or the transition frame; the rear shaft seat is installed on the box body and fixedly connected with the box body; the rear shaft is installed on the rear shaft seat and fixedly connected with the rear shaft seat; the rear shaft sleeve is sleeved on the rear shaft and can rotate on the rear shaft seat; the rear shaft sleeve is fixedly connected with the lock rod and drives the lock rod to swing on the rear shaft seat; the middle shaft is installed on the middle shaft seat and connected with the middle shaft seat, and located on the upper surface of the lock rod; the middle shaft seat is installed on the skeleton vehicle or the transition frame and fixedly connected with the skeleton vehicle or the transition frame; the middle shaft seat is a plate-shaped body and can guide and limit the swinging movement of the lock rod; the front shaft seat is installed on the transition frame and connected with the transition frame, and the front shaft seat remains stationary together with the transition frame when the box body is tilted backward; in this document, the front, rear, left, right, up and down are all based on the direction of vehicle travel.

[0004] Further, the lock rod and the lock head part are provided with reinforcing ribs, and the reinforcing ribs are arranged at the lower part of the lock rod and the rear part of the lock head.

[0005] Further, the rear shaft is sleeved with the rear shaft seat and can rotate on the rear shaft seat.

[0006] Further, the lock head has an inclined slope, and the direction of the slope is to open backward.

[0007] Further, the automatic lock further comprises a guide block, and the guide block is installed on the rear door and located on the outer side of the rear door, that is, the lower part of the rear surface of the rear door.

[0008] Advantages

[0009] The application has the beneficial effect that the automatic opening and locking of the rear door of the freight container during unloading can be realized without manual operation, which facilitates the unloading of the freight container and improves the freight efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a schematic view of the state of the freight container placed on the skeleton vehicle

[0011] Figure 2 is an enlarged view of the vicinity of the rear door of the freight container

[0012] Figure 3 is a schematic view of the structure of the automatic lock

[0013] Figure 4 is a schematic view of the structure of the automatic lock in the installed state

[0014] Figure 5 is another perspective view of the structure of the automatic lock in the installed state

[0015] 1. box, 2. transition frame, 3. skeleton vehicle, 4. skeleton vehicle longitudinal beam, 5. skeleton vehicle rear cross beam, 6. freight container rear door frame, 7. automatic lock guide block, 8. rear door, 61. lock head, 62. reinforcing rib, 63. rear axle seat, 64. rear axle, 65. middle axle, 66. middle axle seat, 67. front axle seat, 68. lock rod, 69. rear axle sleeve. DETAILED DESCRIPTION

[0016] In order to better illustrate the technical solutions of the application, the specific embodiments of the application will be further described in combination with the drawings, such as Figures 1-5In this example, the common board strip steel in the industry is selected as the lock head 61 and the lock rod 68, and the upper end of the lock head 61 is bent, so that the automatic lock guide block 7 is conveniently entered or separated from the automatic lock, in this example, the automatic lock guide block 7 with a U-shaped cross section is selected, and the automatic lock guide block 7 is installed below the rear side of the rear door and corresponds to the position of the lock head 61, a plurality of automatic locks 6 can be installed at the lower end of the same rear door, in this example, two automatic locks 6 are selected and installed in parallel; two corresponding automatic lock guide blocks 7 are installed; in this example, the lock head 61 and the lock rod 62 are integrated, and a long notch is provided at the front end of the lock rod 62, the width of the notch is greater than the thickness of the middle shaft seat 66, and the length satisfies that when the lock rod 62 swings around the front end, no interference is generated with the middle shaft seat 66; the lock rod 68 is welded with the rear shaft sleeve 69, so that the lock rod 68 rotates with the rear shaft sleeve 69 around the rear shaft 64; in this example, a piece of steel strip is attached and welded below and behind the lock rod 68 and the lock head 61 as a reinforcing rib 62, so that the strength and impact resistance of the lock head 61 and the lock rod 62 can be increased, and no interference is generated with other parts near the lock rod 62; the common double-ear shaft seat and the shaft with a limiting pin at the end in the industry are selected as the rear shaft seat 63 and the rear shaft 64; the rear shaft seat 63 is fixedly installed on the rear door frame and fixedly connected with the rear door frame, the rear shaft sleeve 69 is sleeved on the rear shaft 64, and the rear shaft is installed on the rear shaft seat 63 and can rotate on the rear shaft seat 63; the common round shaft in the industry is selected as the middle shaft 65, the plate-shaped shaft seat is selected as the middle shaft seat 66, the middle shaft seat 66 is fixedly installed on the transition frame 2 or the skeleton car rear cross beam 5 and fixed, and the middle shaft 65 is installed on the middle shaft seat 66 and fixedly connected with the middle shaft seat 66; the front shaft seat provided on the transition frame 2 in the industry is selected as the front shaft seat 67 of this example, which can support the backward overturning of the box body 1; thus, the implementation of the application is completed.

[0017] In application, the cargo container is placed on the skeleton vehicle, loaded with goods, and transportation begins. Upon arrival at the destination, unloading begins. The lifting mechanism lifts the front end of the container 1. The rear of the container 1, supported by the front axle seat 67, rotates around the shaft on the front axle seat 67. The rear door 8 of the container 1 swings downward with the rear of the container 1. Since the front end of the locking rod 62 contacts the rear crossbeam 5 of the skeleton vehicle, and the rear crossbeam 5 is fixed, the rear axle seat 63 swings downward with the rear end of the container 1, thereby causing the rear axle sleeve 69 to swing downward. This causes the middle part of the locking lever 68 to swing downwards. Since the rear axle sleeve 69 is located in the middle area of ​​the locking lever 68, according to the lever principle, the power arm is short. However, the distance from the locking head 61 to the fixed point of the locking lever 68 (that is, the contact point between the locking lever 68 and the rear crossbeam 5 of the frame vehicle) is long. This results in the swing amplitude of the locking head 61 being greater than that of the rear axle sleeve 69. Consequently, the locking head 61 moves away from the automatic lock guide block 7 installed on the outside of the rear door 8, thereby releasing the rear door 8. This allows the rear door 8 to push the goods inside the box 1 and move under its own weight. The door opens automatically; after unloading, the lifting system lowers the front of the container 1, and the rear door 8 moves towards the rear door frame of the container 1 under its own weight and closes with the door frame. At this time, the rear axle sleeve 69 drives the rear end of the locking rod 68 to move upward. Since the front end of the locking rod 68 is in a floating state at this time, the lock head 61 cannot engage with the automatic lock guide block 5 to lock the rear door 8. When the container 1 swings clockwise to an almost horizontal position, the upper rear part of the locking rod 68 contacts the central shaft 65. The central shaft 65 prevents the movement of the tail of the locking rod 68, thus locking the rear door. The floating state of the locking rod 68 is restrained, and a rotational torque is formed between the central shaft 65 and the rear shaft 64. As the rear shaft sleeve 69 drives the middle part of the locking rod 68 to move upward, the locking rod 68 swings rapidly clockwise around the central shaft 65 as the fulcrum, exceeding the speed at which the rear door 8 flips with the box 1, so that the lock head 61 engages with the automatic lock guide block 5 and locks it, thus achieving the purpose of locking the rear door 8 to the rear door frame of the box 1. This completes one work cycle. The whole process does not require manual intervention and is automatically realized, which improves transportation efficiency and reduces labor intensity.

Claims

1. An automatic lock for the rear door of an automatic rear unloading freight container, characterized in that: The automatic lock is installed on the freight box, the freight box comprises a box body, a box frame, a transition frame, a rear door and an automatic lock; the transition frame is installed between the skeleton vehicle and the box body and does not overturn during unloading; the automatic lock is installed on the box body and located at the lower part of the rear door, comprising a lock head, a rear axle seat, a rear axle, a middle axle, a middle axle seat, a front axle seat, a lock rod and a rear axle sleeve; the lock head is installed on the lock rod and located on the upper surface of the front end of the lock rod and connected with the lock rod; the lock rod is installed on the rear axle sleeve and fixedly connected with the rear axle sleeve and can rotate on the rear axle together with the rear axle sleeve; the front end of the lock rod is provided with a long slot or a notch, the width of the notch is greater than or equal to the thickness of the middle axle seat, and the middle axle seat can be clamped and moved up and down along the middle axle seat; the lock rod is lapped on the cross beam of the skeleton vehicle or the base of the transition frame, and when the box body is reversed backward, the lock rod rotates around the contact point of the lock rod and the skeleton vehicle or the transition frame; the rear axle seat is installed on the box body and fixedly connected with the box body; the rear axle is installed on the rear axle seat and fixedly connected with the rear axle seat; the rear axle sleeve is sleeved on the rear axle and can rotate on the rear axle seat; the rear axle sleeve is fixedly connected with the lock rod and drives the lock rod to swing on the rear axle seat; the middle axle is installed on the middle axle seat and connected with the middle axle seat and located above the lock rod; the middle axle seat is installed on the skeleton vehicle or the transition frame and fixedly connected with the skeleton vehicle or the transition frame; the middle axle seat is a plate-shaped body and can guide and limit the swinging movement of the lock rod; the front axle seat is installed on the transition frame and connected with the transition frame, and the front axle seat remains stationary with the transition frame when the box body is inclined backward; in this article, the front, rear, left, right, up and down are all based on the direction of vehicle travel.

2. An automatic lock for the rear door of an automatic rear unloading vehicle body according to claim 1, characterized in that: The lock rod and the lock head are provided with reinforcing ribs, the reinforcing ribs are arranged at the lower part of the lock rod and the rear part of the lock head.

3. An automatic lock for the rear door of an automatic rear unloading vehicle body according to claim 1, characterized in that: The rear axle is sleeved with the rear axle seat and can rotate on the rear axle seat.

4. An automatic lock for the rear door of an automatic rear unloading vehicle body according to claim 1, characterized in that: The lock head is provided with an inclined slope, and the direction of the slope is to open backward.

5. An automatic lock for the rear door of an automatic rear unloading vehicle body according to claim 1, characterized in that: The automatic lock further comprises a guide block, the guide block is installed on the rear door and located on the outer side of the rear door, that is, the lower part of the rear surface of the rear door.

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