Connecting rod type opening and closing locking mechanism of rear dump semitrailer and rear dump semitrailer

Abstract

The connecting rod type opening and closing locking mechanism comprises a door opening lock hook, a front fixing seat, a rear fixing seat and a lower frame limiting cross beam arranged on a lower frame, the door opening lock hook is rotationally connected to the rear fixing seat through a lock hook pin shaft, the front fixing seat is fixed to the front end of the bottom of an upper frame, and the rear fixing seat is fixed to the lower frame limiting cross beam. The rear fixing seat is fixed at the rear end of the bottom of the upper frame; an L-shaped rotating plate is rotationally arranged on the front fixing seat through a rotating plate pin shaft, the upper end of the L-shaped rotating plate is hinged to the inner end of the door unlocking hook through a connecting rod assembly, and the lower end of the L-shaped rotating plate is movably pressed on the upper surface of the lower frame limiting cross beam; the connecting rod assembly comprises a pull rod hinged to the door unlocking hook and a turn buckle connected to the pull rod, one end of the turn buckle is hinged to the upper end of the L-shaped rotating plate, and a tension spring is arranged on the rear side of the pull rod. The connecting rod type opening and closing locking mechanism of the rear dump semitrailer solves the problem of installation interference, and meanwhile can meet the requirements of being easy to adjust and maintain in later use.

Description

Technical Field

[0001] The utility model relates to the field of dump trailers, in particular to a connecting rod type opening and closing locking mechanism of a rear dump trailer and a rear dump trailer. Background Art

[0002] At present, the most common door opening structure of rear-dumping semi-trailers on the market is the iron chain door opening mechanism. The specific structure is that the lower frame is welded with an iron chain fixing seat, and the upper frame is welded with a door opening lock hook. The two are connected by an iron chain. When not lifted, the iron chain is in a tightened state, and the lock hook clamps the rear box door. When lifted, the tail of the upper frame gradually moves down, the iron chain loosens, and the lock hook gradually moves away from the rear box door. When lifted to a certain angle, the rear box door opens and starts to unload. This structure requires the relative position of the tail of the upper and lower frames, otherwise it will affect the opening and subsequent maintenance will be more troublesome.

[0003] The utility model patent with the authorization announcement number CN214164813U discloses a hydraulic sideboard locking device for dump trucks, including a compartment floor, a rear compartment door, a double-acting oil cylinder, two hydraulic lock hooks driven by the double-acting oil cylinder, and a locking block respectively arranged for each of the hydraulic lock hooks, the middle parts of the two hydraulic lock hooks are hinged at the bottom of the rear end of the compartment floor, the two locking blocks are protrudingly arranged at the bottom of the rear compartment door, the double-acting oil cylinder is arranged horizontally, the piston rod end and the cylinder end of the double-acting oil cylinder are respectively hinged to the driving ends of the two hydraulic lock hooks, and the lock hook end of the hydraulic lock hook can lock or release the locking block through the extension and contraction of the double-acting oil cylinder. The hydraulic sideboard locking device for dump trucks has the advantages of scientific design, strong locking force, good sealing effect, and good environmental protection. However, the device does not solve the problem of high relative position requirements for the tail of the upper and lower shelves. Utility Model Content

[0004] In order to solve the adverse effect of interference with the arrangement of accessories due to the length difference between the tails of the upper and lower frames, and to meet the requirements of easy adjustment and easy maintenance in later use, the technical solution adopted by the utility model is: a connecting rod type opening and closing locking mechanism for a rear unloading semi-trailer, including a door opening lock hook, a front fixing seat, a rear fixing seat and a lower frame limiting crossbeam arranged on the lower frame, the door opening lock hook is rotatably connected to the rear fixing seat through a lock hook pin, the front fixing seat is fixed to the front end of the bottom of the upper frame, and the rear fixing seat is fixed to the rear end of the bottom of the upper frame;

[0005] An L-shaped rotating plate is rotatably arranged on the front fixed seat through a rotating plate pin, the upper end of the L-shaped rotating plate is hinged to the inner end of the door lock hook through a connecting rod assembly, and the lower end of the L-shaped rotating plate is movably pressed on the upper surface of the lower frame limiting beam;

[0006] The connecting rod assembly includes a pull rod hinged to the door lock hook and a basket bolt connected to the pull rod, one end of the basket bolt is hinged to the upper end of the L-shaped rotating plate, and a tension spring connected to the rear end of the upper frame is arranged on the side of the pull rod close to the door lock hook.

[0007] Based on the above, the bending part of the L-shaped rotating plate is hinged to the front fixing seat.

[0008] Based on the above, in order to limit the rotation range, limit plates are respectively provided between the rotating plate pin and the front fixing seat, and between the locking hook pin and the rear fixing seat.

[0009] Based on the above, the L-shaped turning plate is an inverted L-shaped turning plate, and the long side of the inverted L-shaped turning plate is movably pressed on the upper surface of the lower frame limiting beam.

[0010] Based on the above, in order to facilitate assembly, one end of the pull rod connected to the door lock hook and one end of the basket bolt connected to the L-shaped rotating plate are respectively provided with U-shaped connecting pieces.

[0011] Based on the above, the hinge point between the pull rod and the rear fixing seat is located above the locking hook pin.

[0012] The utility model also provides a rear-dumping semi-trailer, which is equipped with the above-mentioned connecting rod type opening and closing locking mechanism of the rear-dumping semi-trailer.

[0013] The utility model has substantial characteristics and progress compared with the prior art. Specifically, the utility model provides a connecting rod type opening and closing locking mechanism for a rear-unloading semi-trailer. The device only needs to weld a limiting cross beam in the middle of the lower frame, and the remaining components are arranged on the lower side of the upper frame, wherein the front fixed seat and the rear fixed seat are welded on the upper frame, the L-shaped rotating plate can rotate around the rotation point, the L-shaped rotating plate and the connecting rod assembly are connected by a pin shaft, and the connecting rod assembly and the door lock hook are also connected by a pin shaft, and the door lock hook can rotate around the rotation point.

[0014] When the box is not lifted and is locked, the L-shaped rotating plate presses against the lower frame limit beam, and the upper end of the L-shaped rotating plate moves forward and overcomes the tension of the strong spring, thereby driving the lock hook to rotate, and the lock hook clamps the rear door. When the box is lifted, the L-shaped rotating plate moves away from the limit beam, and the strong tension spring pulls the connecting rod assembly to move backward, the lock hook fixing seat is released, and the rear box door is opened under the combined action of the box cargo and the rear door's deadweight, achieving the purpose of opening the door to unload.

[0015] The rear unloading semi-trailer connecting rod type opening and closing locking mechanism has a wider relative structure of the upper and lower rack tails, and the lower rack space can be adjusted, which is more convenient for arranging accessories. At the same time, it can also avoid the situation where the iron chain door opening structure cannot work due to the inappropriate relative position difference of the upper and lower rack tails.

[0016] Furthermore, the device is more convenient to use and maintain. The total length of the entire pull rod structure can be adjusted by the basket bolts, and each component is a connecting piece, so the replacement and maintenance of each assembly is more convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a schematic diagram of the locking state structure of the connecting rod type opening and closing locking mechanism of the rear unloading semi-trailer provided by the utility model.

[0018] Figure 2 The utility model is a schematic diagram of the structure of the opening state of the connecting rod type opening and closing locking mechanism of the rear unloading semi-trailer provided by the utility model.

[0019] Figure 3 The utility model is a schematic diagram of the structure of a connecting rod assembly in a connecting rod type opening and closing locking mechanism for a rear dumping semi-trailer.

[0020] In the figure: 1. upper frame; 2. rear box door; 3. rear fixed seat; 4. door lock hook; 5. lock hook pin; 6. pull rod; 7. flip seat; 8. lower frame; 9. basket bolt; 10. lower frame limit beam; 11. L-shaped turn plate; 12. turn plate pin; 13. front fixed seat; 14. tension spring; 15. limit plate. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further described in detail below through specific implementation methods.

[0022] Example 1

[0023] This embodiment provides a connecting rod type opening and closing locking mechanism for a rear dump trailer. Figure 1 , Figure 2 , Figure 3 As shown, it includes a door lock hook 4, a front fixing seat 13, a rear fixing seat 3 and a lower frame limiting cross beam 10 arranged on the lower frame 8. The door lock hook 4 is rotatably connected to the rear fixing seat 3 through a lock hook pin 5. The front fixing seat 13 is fixed to the front end of the bottom of the upper frame 1, and the rear fixing seat 3 is fixed to the rear end of the bottom of the upper frame 1. A flip seat 7 that flips with the lower frame 8 is arranged at the bottom of the rear side of the upper frame 1, and a rear box door 2 is arranged on the upper part of the rear side of the upper frame 1 through a hinge, and the bottom of the rear box door 2 is matched with the door lock hook.

[0024] An L-shaped rotating plate 11 is rotatably provided on the front fixed seat 13 via a rotating plate pin 12. The upper end of the L-shaped rotating plate 11 is hinged to the inner end of the door lock hook 4 via a connecting rod assembly. The lower end of the L-shaped rotating plate 11 is movably pressed on the upper surface of the lower frame limiting beam 10.

[0025] The connecting rod assembly includes a pull rod 6 hinged to the door lock hook 4 and a turnbuckle 9 connected to the pull rod 6. One end of the turnbuckle 9 is hinged to the upper end of the L-shaped rotating plate 11, and a tension spring 14 connected to the rear end of the upper frame is provided on the side of the pull rod 6 close to the door lock hook 4.

[0026] In this embodiment, the bending part of the L-shaped rotating plate 11 is hinged to the front fixing seat 13. The hinge point between the pull rod 6 and the rear fixing seat 3 is located above the locking hook pin 5.

[0027] Example 2

[0028] This embodiment provides a connecting rod type opening and closing locking mechanism for a rear-unloading semi-trailer. The main difference from Embodiment 1 is that in this embodiment: in order to limit the rotation range, a limiting plate 15 is further provided between the rotating plate pin shaft and the front fixed seat, and between the locking hook pin shaft and the rear fixed seat.

[0029] The L-shaped rotating plate is an inverted L-shaped rotating plate, and the long side of the inverted L-shaped rotating plate is movably pressed on the upper surface of the lower frame limiting crossbeam. In order to facilitate assembly, one end of the pull rod connected to the door lock hook and one end of the basket bolt connected to the L-shaped rotating plate are respectively provided with U-shaped connecting pieces.

[0030] Example 3

[0031] This embodiment provides a rear-dumping semi-trailer equipped with the connecting rod type opening and closing locking mechanism of the rear-dumping semi-trailer described in Embodiment 1 or Embodiment 2.

[0032] Specifically, the utility model provides a connecting rod type opening and closing locking mechanism for a rear unloading semi-trailer, in which the turnbuckle bolt is a screw structure, and the total length of the turnbuckle bolt can be increased or decreased by rotating the return structure in the middle. One end of the turnbuckle bolt is welded to the U-shaped connector at the front fixed seat, and the other end is welded to the pull rod, and one side of the pull rod is connected to the rear end of the upper frame through a tension spring. The tension spring is in a stretched state, and the other side of the pull rod is welded to the U-shaped connector at the rear fixed seat.

[0033] When the box body is not lifted and the rear box is in a locked state, the L-shaped turn plate is pressed onto the lower frame limit beam, and the upper end of the L-shaped turn plate moves forward and overcomes the tension of the tension spring, thereby driving the door lock hook to rotate. At this time, the door lock hook clamps the rear door.

[0034] When the box is lifted, the L-shaped turning plate moves away from the lower shelf limit beam. At this time, the tension spring pulls the connecting rod assembly to move backward, and the door lock hook rotates and releases. Under the combined effect of the box cargo and the rear door's own weight, the rear box door opens, achieving the purpose of opening the door to unload.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A connecting rod type opening and closing locking mechanism for a rear dump semi-trailer, characterized in that: It includes a door lock hook, a front fixing seat, a rear fixing seat and a lower frame limiting crossbeam arranged on the lower frame, the door lock hook is rotatably connected to the rear fixing seat through a lock hook pin, the front fixing seat is fixed to the front end of the bottom of the upper frame, and the rear fixing seat is fixed to the rear end of the bottom of the upper frame; An L-shaped rotating plate is rotatably arranged on the front fixed seat through a rotating plate pin, the upper end of the L-shaped rotating plate is hinged to the inner end of the door lock hook through a connecting rod assembly, and the lower end of the L-shaped rotating plate is movably pressed on the upper surface of the lower frame limiting beam; The connecting rod assembly includes a pull rod hinged to the door lock hook and a basket bolt connected to the pull rod, one end of the basket bolt is hinged to the upper end of the L-shaped rotating plate, and a tension spring connected to the rear end of the upper frame is arranged on the side of the pull rod close to the door lock hook.

2. The connecting rod type opening and closing locking mechanism for a rear dump trailer according to claim 1, characterized in that: The bending part of the L-shaped rotating plate is hinged to the front fixing seat.

3. The connecting rod type opening and closing locking mechanism for a rear dump trailer according to claim 2 is characterized in that: Limiting plates are also arranged between the rotating plate pin and the front fixing seat, and between the locking hook pin and the rear fixing seat respectively.

4. The connecting rod type opening and closing locking mechanism for a rear dump trailer according to claim 1, 2 or 3, characterized in that: The L-shaped rotating plate is an inverted L-shaped rotating plate, and the long side of the inverted L-shaped rotating plate is movably pressed on the upper surface of the lower frame limiting cross beam.

5. The connecting rod type opening and closing locking mechanism for a rear dump trailer according to claim 4 is characterized in that: One end of the pull rod connected to the door lock hook and one end of the basket bolt connected to the L-shaped rotating plate are respectively provided with U-shaped connecting pieces.

6. The connecting rod type opening and closing locking mechanism for a rear dump trailer according to claim 5, characterized in that: The hinge point between the pull rod and the rear fixing seat is located above the locking hook pin.

7. A rear-dumping semitrailer, characterized in that: The rear-dumping semi-trailer is equipped with a connecting rod type opening and closing locking mechanism for the rear-dumping semi-trailer according to any one of claims 1 to 6.

Images