Automatic locking device for rear baffle of tilting cart

Abstract

An automatic locking device for a rear baffle of a tilting cart belongs to the technical field of tilting carts and comprises an air reservoir, an electromagnetic switch valve, a pneumatic pump and a pneumatic locking unit which are sequentially connected. The pneumatic locking unit comprises a pneumatic arm, a locking hook head and a locking shaft arranged on the rear baffle, a rotating shaft is arranged on the pneumatic arm, the rotating shaft penetrates through a communicating hole in the pneumatic arm to be fixedly connected with the compartment hopper, and the pneumatic arm can rotate around the rotating shaft; one end of the pneumatic arm is rotationally connected with the upper end of the pneumatic rod through a bolt, and the other end of the pneumatic arm is fixedly connected with the locking hook head; the locking hook head is matched with the locking shaft so that the compartment hopper can be tightly attached to the rear baffle. According to the technical scheme, the opening degree of the electromagnetic switch valve is adjusted, and the locking hook head is controlled to descend and be buckled to the locking shaft, so that the compartment hopper is tightly attached to the rear baffle, and the sealing effect is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of dump trucks, and particularly relates to an automatic locking device for a tailgate of a dump truck. Background Art

[0002] A dump truck is a special vehicle with a tiltable bucket that is used to transport materials over short distances. A "bucket"-shaped container is installed on the vehicle body, which can be flipped over to facilitate unloading. It is suitable for short-distance transportation of various bulk materials such as sand, gravel, earth, coal, and ore. It has strong power and usually has a mechanical bucket return function. The dump truck comes with a tailgate chain automatic locking hook, which is used to lock the tailgate to prevent the material in the bucket from leaking. When the dump truck stops to unload, the bucket rises, the chain of the automatic chain locking hook loosens, and the tailgate automatically opens due to the impact of the material. The material is unloaded, and after unloading is completed, the bucket falls back, and the locking hook automatically locks the tailgate under the pull of the chain. This locking structure has the following defects:

[0003] (1) Since the length and tightness of the chain are fixed, the chain will become loose or deformed over time, which will cause the sealing between the tailgate and the box to deteriorate, leaving a gap, and materials will seep out of the gap, causing pollution.

[0004] (2) Since the locking force of this locking structure is fixed, in certain specific transportation environments, such as uphill and downhill, bumpy roads, etc., when the carriage is loaded with heavy goods, the expansion force of the tailgate can easily exceed its locking force, resulting in a gap and also causing leakage. Utility Model Content

[0005] The invention aims to provide an automatic locking device for a tailgate of a dump truck with good sealing performance and adjustable locking force.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An automatic locking device for the tailgate of a dump truck comprises an air reservoir, an electromagnetic switch valve, a pneumatic pump, and a pneumatic locking unit connected in sequence; the air reservoir is connected to the electromagnetic switch valve via a pipeline, and then to the pneumatic pump; the pneumatic pump is provided with a pneumatic rod that moves up and down controlled by air filling and deflation, and the upper end of the pneumatic rod is connected to the pneumatic locking unit;

[0008] The pneumatic locking unit includes a pneumatic arm, a locking hook and a locking shaft arranged on the tailgate. The pneumatic arm is provided with a rotating shaft, which passes through a connecting hole on the pneumatic arm and is fixedly connected to the box, and the pneumatic arm can rotate around the rotating shaft; one end of the pneumatic arm is rotatably connected to the upper end of the pneumatic rod by a bolt, and the other end is fixedly connected to the locking hook; the locking hook cooperates with the locking shaft to achieve a close fit between the box and the tailgate.

[0009] Preferably, the connecting holes are arranged in parallel at intervals.

[0010] Preferably, a pressure pulley is sleeved on the outer side of the locking shaft, and the pressure pulley is rotatably connected to the locking shaft.

[0011] Preferably, the compartment is provided with a sealing strip that cooperates with the tailgate.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The technical solution of the present invention controls the air reservoir to inflate the pneumatic pump by adjusting the opening of the electromagnetic switch valve. The high-pressure gas entering the pneumatic pump pushes the rubber cup upward, and the rubber cup drives the pneumatic rod to rise. The end of the pneumatic rod connected to the pneumatic arm rises accordingly, and the locking hook head descends and engages with the locking shaft, so that the box and the tailgate fit tightly together to achieve a sealing effect.

[0014] 2. The technical solution of the present invention utilizes the principle of lever, and the pneumatic arm rotates around the rotating axis, so that the locking hook head is engaged with the locking axis, so that the box and the tailgate fit tightly; by arranging connecting holes on the pneumatic arm, the connecting holes are arranged in multiple parallel intervals, and the position of the rotating axis on the pneumatic arm can be adjusted, the length of the force arm can be changed, and the locking force can be changed.

[0015] 3. The technical solution of the present invention reduces the sliding wear between the locking hook head and the locking shaft by sleeve-mounting a pressure pulley on the outside of the locking shaft, thereby extending the service life of the component.

[0016] 4. According to the technical solution of the present invention, the driver of the dump truck can complete the entire unloading process by simply adjusting the opening of the electromagnetic switch valve in the cab, which greatly improves the convenience and safety of unloading.

[0017] 5. Compared with the existing technology, the technical solution of the present invention provides an adjustable locking force and a better sealing effect. When transporting water-containing materials, it can not only prevent water leakage, but also increase the carrying capacity of the dump truck, reduce on-site pollution, and improve the convenience and safety of unloading. It has good practicality and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specific embodiments of the present invention are described in further detail below with reference to the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the automatic locking device for the tailgate of a dump truck.

[0020] In the figure: 1. Box, 2. Chassis, 3. Air cylinder, 4. Solenoid switch valve, 5. Pneumatic pump, 6. Rubber cup, 7. Return spring, 8. Fixed bracket, 9. Pneumatic rod, 10. Pneumatic arm, 11. Connecting hole, 12. Rotating shaft, 13. Rear baffle, 14. Locking hook, 15. Locking shaft, 16. Pressure pulley. DETAILED DESCRIPTION

[0021] One embodiment of the automatic locking device for the tailgate of a dump truck of the utility model is as follows: Figure 1 As shown, the automatic locking device for the tailgate of a dump truck comprises an air cylinder 3, an electromagnetic switch valve 4, a pneumatic pump 5 and a pneumatic locking unit connected in sequence; the air cylinder 3 and the pneumatic pump 5 are fixed to the chassis 2 of the dump truck through a fixing bracket; the pneumatic pump 5 comprises a lower sealing cover and an upper sealing cover fixedly connected by bolts, the lower sealing cover and the upper sealing cover are buckled together to form a closed cavity, a rubber cup 6 is provided in the closed cavity, the edge of the rubber cup 6 is sealed and fixed to the upper and lower sealing covers by bolts; the closed cavity is also provided with upper and lower vertical A reset spring 7 is provided, the upper end of the spring 7 is fixedly connected to the inner wall of the upper sealing cover, and the lower end of the spring 7 is fixedly connected to the rubber cup 6; a pneumatic rod 9 is also provided vertically in the closed cavity, the air reservoir 3 is provided with an air outlet, the solenoid switch valve 4 is provided with an air inlet, an air outlet and an exhaust port, and the exhaust port is connected to the outside world to play an exhaust role; the air outlet of the air reservoir 3 is connected to the air inlet of the solenoid switch valve 4 through a pipeline, the lower sealing cover is provided with an air inlet, and the air outlet of the solenoid switch valve 4 is connected to the air inlet of the lower sealing cover through a pipeline;

[0022] The pneumatic locking unit includes a pneumatic arm 10, a locking hook 14 and a locking shaft 15 arranged on the tailgate 13. The pneumatic arm 10 is provided with a rotating shaft 12, and the rotating shaft 12 passes through the connecting hole 11 on the pneumatic arm 10 and is fixedly connected to the box 1. The pneumatic arm 10 can rotate around the rotating shaft 12; one end of the pneumatic arm 10 is rotatably connected to the upper end of the pneumatic rod 9 by a bolt, and the other end is fixedly connected to the locking hook 14; the locking hook 14 cooperates with the locking shaft 15 to achieve a close fit between the box 1 and the tailgate 13.

[0023] The connecting holes 11 on the pneumatic arm 10 are arranged in multiple parallel intervals, and the rotating shaft 12 passes through the connecting holes 11 and is fixedly connected to the compartment 1; the position of the rotating shaft 12 on the pneumatic arm 10 can be adjusted through the multiple connecting holes 11, which is used to change the position of the rotating shaft 12 on the pneumatic arm 10, change the length of the force arm, and then adjust the locking force.

[0024] A pressure pulley 16 is sleeved on the outer side of the locking shaft 15, and the locking hook head 14 is buckled on the pressure pulley 16 and cooperates with the locking shaft 15. The pressure pulley 16 is rotatably connected to the locking shaft 15, which reduces sliding wear between components and extends the service life of the components.

[0025] Preferably, the compartment 1 is provided with a sealing strip that cooperates with the tailgate 13 to further improve the sealing effect.

[0026] The electromagnetic switch valve 4 is electrically connected to an electric switch provided in the cab.

[0027] The working process of the automatic locking device for the tailgate of the dump truck is as follows: before the dump truck is unloaded, the driver closes the electromagnetic switch valve 4 in the cab, the air inlet and the air outlet of the electromagnetic switch valve 4 are disconnected, and the exhaust port and the air outlet are connected; the high-pressure gas in the cavity of the pneumatic pump 5 is discharged through the exhaust port; during the exhaust process, the rubber cup 6 drives the pneumatic rod 9 When the pneumatic rod 9 moves downward, it is connected to one end of the pneumatic arm 10, and the rotating shaft 12 is used as a fulcrum. The locking hook 14 at the other end of the pneumatic arm 10 is tilted by the lever principle, and the locking shaft 15 is released, so that the tailgate 13 can be opened normally for unloading. After unloading, the tailgate 13 falls back, and the driver opens the electromagnetic switch valve 4 in the cab. The air outlet and exhaust port of the electromagnetic switch valve 4 are disconnected, and the air inlet and outlet are connected, and the air source is connected. The high-pressure gas enters the cavity of the pneumatic pump 5 through the pipeline, pushing the rubber cup 6 to move upward, driving the spring 7 to tighten and pushing the pneumatic rod 9 to move upward. Similarly, the lever principle is used to make the locking hook 14 fit tightly with the locking shaft 15. Because the electromagnetic switch valve 4 is continuously energized, there is always air source pressure to achieve a continuous locking effect.

Claims

1. An automatic locking device for the tailgate of a dump truck, characterized in that: The invention comprises an air storage cylinder (3), an electromagnetic switch valve (4), a pneumatic pump (5) and a pneumatic locking unit connected in sequence; the air storage cylinder (3) is connected to the electromagnetic switch valve (4) through a pipeline, and then connected to the pneumatic pump (5); a pneumatic rod (9) is provided in the pneumatic pump (5) and moves up and down by controlling the filling and discharging of air, and the upper end of the pneumatic rod (9) is connected to the pneumatic locking unit; The pneumatic locking unit comprises a pneumatic arm (10), a locking hook (14) and a locking shaft (15) arranged on the rear baffle (13); the pneumatic arm (10) is provided with a rotating shaft (12), the rotating shaft (12) passes through the connecting hole (11) on the pneumatic arm (10) and is fixedly connected to the box (1); the pneumatic arm (10) can rotate around the rotating shaft (12); one end of the pneumatic arm (10) is rotatably connected to the upper end of the pneumatic rod (9) by a bolt, and the other end is fixedly connected to the locking hook (14); the locking hook (14) cooperates with the locking shaft (15) to achieve a tight fit between the box (1) and the rear baffle (13).

2. The automatic locking device for the tailgate of a dump truck according to claim 1, characterized in that: The connecting holes (11) are arranged in parallel at intervals.

3. The automatic locking device for the tailgate of a dump truck according to claim 1, characterized in that: The outer side of the locking shaft (15) is provided with a pressure pulley (16), the locking hook (14) is buckled on the pressure pulley (16), and cooperates with the locking shaft (15), and the pressure pulley (16) is rotatably connected to the locking shaft (15).

4. The automatic locking device for the tailgate of a dump truck according to claim 1, characterized in that: The compartment (1) is provided with a sealing strip that cooperates with the rear baffle (13).

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