Rigid dumper lifting system

Abstract

The utility model provides a rigid dumper lifting system which comprises a pilot oil source, a main control valve, a lifting oil cylinder and an oil tank, the oil tank, a hydraulic pump, the main control valve and the lifting oil cylinder are sequentially connected through oil pipes to form a main control oil way, and the oil tank, the hydraulic pump and the pilot oil source are sequentially connected through oil pipes to form a pilot oil way. The pilot oil source comprises a shuttle valve, a pressure reducing valve, a one-way valve, an energy accumulator, a descending proportional electromagnetic valve and a lifting electromagnetic valve which are sequentially connected through oil pipes, an electric pilot handle used for controlling the descending proportional electromagnetic valve and the lifting electromagnetic valve to be opened and closed is arranged in a cab, and the main control valve comprises a lifting position, a descending position, a stopping position and a floating position. According to the rigid dumper lifting system, the electric pilot handle is adopted to replace a hydraulic pilot handle, many pipeline arrangements are saved, the oil leakage risk is reduced, and the electric pilot handle and the pilot oil source electromagnetic valve are combined, so that lifting, descending, floating and stopping actions of the whole dumper can be operated remotely or unmanned.

Description

Technical Field

[0001] The utility model relates to the technical field of dump trucks, in particular to a lifting system of a rigid dump truck. Background Art

[0002] The rigid dump truck is equipped with a hydraulic system, which mainly realizes the steering, lifting, braking and other functions of the whole vehicle. Since the rigid dump truck is an off-road transport vehicle, the road conditions on which it travels are poor and bumpy. In order to better adapt to this road condition, the cargo compartment of the rigid dump truck needs to have four functions: lifting, lowering, stopping, and floating. Existing rigid dump trucks mostly use a hydraulic pilot handle to control the lifting main control valve, and control the lifting cylinder through the lifting main control valve to achieve these functions. The lifting cylinder is installed on the frame at one end through a hinge point, and on the cargo compartment at the other end. The piston rod of the lifting cylinder is extended to lift the cargo compartment, and the piston rod of the lifting cylinder is retracted to control the lowering of the cargo compartment.

[0003] The lifting process of the cargo box of a rigid dump truck is the process of unloading. After unloading, the cargo box drops to the initial position and should remain in this position. This position is the stop position. When the rigid dump truck is driving on a bumpy road, in order to reduce the vibration and impact of the uneven road surface on the entire vehicle, the rigid dump truck needs to be placed in a floating position, that is, at this time the cargo box can be adjusted accordingly with the bumps of the road.

[0004] When a rigid dump truck is driving on a bumpy road, it is required to place the lifting main control valve in the floating position and self-lock it in this position. There are few manufacturers of domestic lifting main control valves, and their forms, structures and hydraulic principles are relatively simple. When you want to achieve the floating function, you need to keep pushing the hydraulic pilot handle with your hand. On the one hand, this position is not easy to control accurately, resulting in the inability to achieve the floating function; on the other hand, the driver cannot push the pilot handle with one hand and operate the steering wheel with the other hand to drive the car. This will cause great safety risks and the driver will be very tired. In addition, the hydraulic pilot handle cannot achieve remote control and unmanned driving functions. Utility Model Content

[0005] The technical problem to be solved by the utility model is: in order to overcome the fact that there are few manufacturers of domestic lifting main control valves in the prior art, and their forms, structures and hydraulic principles are relatively simple. When you want to achieve the floating function, you need to keep pushing the hydraulic pilot handle with your hand. On the one hand, this position is not easy to control accurately, resulting in the inability to achieve the floating function; on the other hand, the driver cannot push the pilot handle with one hand and operate the steering wheel with the other hand to drive the car. This will cause great safety risks and the driver will be very tired. In addition, the hydraulic pilot handle cannot achieve the shortcomings of remote control and unmanned driving. The utility model provides a rigid dump truck lifting system.

[0006] The utility model solves the technical problem by adopting the following technical solution: a lifting system for a rigid dump truck, comprising a pilot oil source, a main control valve, a lifting oil cylinder and an oil tank, wherein the oil tank, the hydraulic pump, the main control valve and the lifting oil cylinder are connected in sequence through an oil pipe to form a main control oil circuit, the oil tank, the hydraulic pump and the pilot oil source are connected in sequence through an oil pipe to form a pilot oil circuit, the pilot oil source comprises a shuttle valve, a pressure reducing valve, a one-way valve, an accumulator, a descending proportional solenoid valve and a lifting solenoid valve connected in sequence through an oil pipe, an electric pilot handle for controlling the opening and closing of the descending proportional solenoid valve and the lifting solenoid valve is arranged in the cab, the main control valve comprises a lifting position, a descending position, a stop position and a floating position,

[0007] When the cargo compartment is lifted, the hydraulic pump works, the electric pilot handle controls the lifting solenoid valve to be energized, the lifting solenoid valve controls the lifting main control valve to be in the lifting position, the lifting cylinder piston rod extends, and the cargo compartment is lifted;

[0008] When the cargo compartment is lowered, the hydraulic pump works, the electric pilot handle controls the lowering proportional solenoid valve to be energized, the lowering proportional solenoid valve controls the lifting main control valve to be in the lowering position, the lifting cylinder piston rod is retracted, and the cargo compartment realizes the lowering action;

[0009] When the cargo compartment stops operating, both the lowering proportional solenoid valve and the lifting solenoid valve are de-energized, the main control valve is in the stop position, and the cargo compartment stops moving;

[0010] When the cargo compartment is floating, the hydraulic pump works and the descending proportional solenoid valve continuously outputs hydraulic oil with a constant pressure value, so that the lifting main control valve is in a floating position.

[0011] The hydraulic pump is used to provide hydraulic oil and power source for the lifting cylinder, and the main control valve is used to control the lifting cylinder to realize the lifting, lowering, stopping and floating functions of the cargo compartment; the electric pilot handle is installed in the cab, and operating the electric pilot handle can output an electrical signal, which is transmitted to the controller and then outputs a control signal to drive the action of the main control valve to realize the lifting, lowering, stopping and floating functions of the cargo compartment; the pilot oil source provides a stable pilot oil source for the electric pilot handle to ensure its control function; the oil tank is used to store hydraulic oil and also serves as a heat dissipator for the hydraulic system.

[0012] When the engine is not working, the accumulator is used to provide a power source for the descending proportional solenoid valve. When it is energized, it controls the main control valve to be in the lifting position, the piston rod of the lifting cylinder is retracted, and the cargo compartment is lowered.

[0013] Furthermore, a safety valve is provided between the pressure reducing valve and the one-way valve, and a pressure measuring joint is provided between the pressure reducing valve and the one-way valve. The pressure measuring joint is used to detect the pressure of the pilot oil source, which is convenient for troubleshooting.

[0014] Furthermore, a balance valve is provided on the oil pipe between the lifting oil cylinder and the main control valve, and the balance valve is used to prevent the lifting oil cylinder from being damaged after the cargo compartment is lifted into place.

[0015] Furthermore, a pressure sensor is provided on the oil pipe between the descending proportional solenoid valve and the main control valve. The pressure sensor is used to monitor the output of the descending proportional solenoid valve and timely detect the realization of the floating position of the cargo compartment.

[0016] Furthermore, a filter and a hydraulic system radiator are arranged in sequence between the output end of the main control valve and the oil tank, and a temperature sensor is arranged between the filter and the hydraulic system radiator. The filter is used to filter impurities and particles in the hydraulic system, maintain the cleanliness of the hydraulic system, and prevent damage to hydraulic components and jamming of valve components; the temperature sensor is used to detect the temperature of the hydraulic system;

[0017] Furthermore, a first transition block is provided between the main control valve and the filter input end, and a bypass valve group is provided between the first transition block and the oil tank. The first transition block is provided to facilitate the merging of pipelines, which can save pipelines and transition joints; the bypass valve group is used to protect the hydraulic system to prevent the filter and the hydraulic system radiator from being blocked and causing damage to the pipeline or hydraulic components.

[0018] Furthermore, a second transition block, a wet bridge and a third transition block are sequentially arranged between the output end of the hydraulic system radiator and the oil tank. The second transition block and the third transition block are provided to facilitate the confluence of the pipelines, which can save pipelines and transition joints; the wet bridge provides a braking function for the whole vehicle. The hydraulic system radiator dissipates heat for the hydraulic system and the wet bridge.

[0019] Furthermore, the oil tank is provided with an air filter. The air filter is used for the passage connecting the hydraulic oil tank and the atmosphere, filtering the air while maintaining the pressure balance between the oil tank and the atmosphere;

[0020] The beneficial effects of the utility model are:

[0021] (1) Reduce the risk of oil leakage, facilitate maintenance, and be more environmentally friendly. Traditional hydraulic pilot handle operation requires the connection of many hydraulic pipelines, which are difficult to maintain and have the risk of pipeline leakage. The leaked hydraulic oil will pollute the environment. This application uses an electric pilot handle instead of a hydraulic pilot handle, which saves a lot of pipeline layout, reduces the risk of oil leakage, and is more environmentally friendly;

[0022] (2) Unmanned driving function can be realized. The combination of the electric pilot handle and the pilot oil source solenoid valve of the present application can remotely or unmannedly operate the lifting, lowering, floating, and stopping actions of the entire vehicle;

[0023] (3) Reduce the vibration and impact of the whole vehicle. The present application can realize the floating function, which is simple and safe to operate, and greatly reduces the impact and influence of the rigid dump truck on the whole vehicle on the bumpy road. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is a structural schematic diagram of the best embodiment of the utility model;

[0026] Figure 2 It is a schematic diagram of the main control valve.

[0027] In the figure: 1. Bypass valve group, 2. First transition block, 3. Filter, 4. Temperature sensor, 5. Hydraulic system radiator, 6. Third transition block, 7. Wet bridge, 8. Second transition block, 9. Pilot oil source, 9.1. Shuttle valve, 9.2. Pressure reducing valve, 9.3. Safety valve, 9.4. Check valve, 9.5. Accumulator, 9.6. Lowering proportional solenoid valve, 9.7. Lifting solenoid valve, 10. Pressure measuring joint, 11. Electric pilot handle, 12. Pressure sensor, 13. Lifting cylinder, 14. Balance valve, 15. Main control valve, 16. Oil tank, 17. Hydraulic pump, 18. Engine, 19. Air filter. DETAILED DESCRIPTION

[0028] Now the utility model is described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the utility model in a schematic manner, so it only shows the components related to the utility model.

[0029] like Figure 1-2 As shown, a rigid dump truck lifting system of the utility model comprises a pilot oil source 9, a main control valve 15, a lifting cylinder 13 and an oil tank 16, a hydraulic pump 17 is transmission-connected to an engine 18, the oil tank 16, the hydraulic pump 17, the main control valve 15 and the lifting cylinder 13 are sequentially connected through oil pipes to form a main control oil circuit, the oil tank 16, the hydraulic pump 17 and the pilot oil source 9 are sequentially connected through oil pipes to form a pilot oil circuit, the pilot oil source 9 comprises a shuttle valve 9.1, a pressure reducing valve 9.2, a one-way valve 9.4, an accumulator 9.5, a descending proportional solenoid valve 9.6 and a lifting solenoid valve 9.7 which are sequentially connected through oil pipes, an electric pilot handle 11 for controlling the opening and closing of the descending proportional solenoid valve 9.6 and the lifting solenoid valve 9.7 is provided in the cab, and the main control valve 15 comprises a lifting position a, a descending position d, a stop position b and a floating position c.

[0030] A safety valve 9.3 is provided between the pressure reducing valve 9.2 and the one-way valve 9.4, and a pressure measuring joint 10 is also provided between the pressure reducing valve 9.2 and the one-way valve 9.4.

[0031] A balance valve 14 is provided on the oil pipe between the lifting cylinder 13 and the main control valve 15 .

[0032] A pressure sensor 12 is provided in the oil pipe between the descending proportional solenoid valve 9.6 and the main control valve 15.

[0033] A filter 3 and a hydraulic system radiator 5 are provided in sequence between the output end of the main control valve 15 and the oil tank 16 , and a temperature sensor 4 is provided between the filter 3 and the hydraulic system radiator 5 .

[0034] A first transition block 2 is provided between the main control valve 15 and the input end of the filter 3 , and a bypass valve group 1 is provided between the first transition block 2 and the oil tank 16 .

[0035] A second transition block 8 , a wet bridge 7 and a third transition block 6 are sequentially arranged between the output end of the hydraulic system radiator 5 and the oil tank 16 .

[0036] An air filter 19 is provided on the oil tank 16 .

[0037] Working process:

[0038] The pilot oil source 9 is equipped with a lifting solenoid valve 9.7 and a lowering proportional solenoid valve 9.6. After the driver operates the electric pilot handle 11 in the cab, the lifting solenoid valve 9.7 and the lowering proportional solenoid valve 9.6 are controlled by the output of the controller to realize the lifting, lowering, stopping and floating functions of the cargo compartment.

[0039] When the cargo compartment is lifted, the hydraulic pump 17 works, the electric pilot handle 11 controls the lifting solenoid valve 9.7 to be energized, the lifting solenoid valve 9.7 controls the lifting main control valve 15 to be in the lifting position, the piston rod of the lifting cylinder 13 extends, and the cargo compartment is lifted;

[0040] When the cargo compartment is lowered, the hydraulic pump 17 works, the electric pilot handle 11 controls the descent proportional solenoid valve 9.6 to be energized, the descent proportional solenoid valve 9.6 controls the lifting main control valve 15 to be in the descending position, the piston rod of the lifting cylinder 13 is retracted, and the cargo compartment is lowered; when the engine is not working, the accumulator 9.5 is used to provide a power source for the descent proportional solenoid valve 9.6. When it is energized, it controls the main control valve 15 to be in the lifting position, the piston rod of the lifting cylinder 13 is retracted, and the cargo compartment is lowered.

[0041] When the cargo compartment stops operating, both the lowering proportional solenoid valve 9.6 and the lifting solenoid valve 9.7 are de-energized, the main control valve 15 is in the stop position, and the cargo compartment stops moving;

[0042] When the cargo compartment is floating, the hydraulic pump 17 works, and the descending proportional solenoid valve 9.6 continuously outputs hydraulic oil with a constant pressure value, so that the lifting main control valve 15 is in a floating position.

[0043] Directions and references (e.g., up, down, left, right, etc.) in the present invention may only be used to assist in the description of features in the accompanying drawings. Therefore, the following detailed description is not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0044] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the scope of the utility model through the above description. The technical scope of this utility model is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A rigid dump truck lifting system, characterized in that: The invention comprises a pilot oil source (9), a main control valve (15), a lifting oil cylinder (13) and an oil tank (16); the oil tank (16), a hydraulic pump (17), a main control valve (15) and a lifting oil cylinder (13) are connected in sequence through an oil pipe to form a main control oil circuit; the oil tank (16), a hydraulic pump (17) and a pilot oil source (9) are connected in sequence through an oil pipe to form a pilot oil circuit; the pilot oil source (9) comprises a shuttle valve (9.1), a pressure reducing valve (9.2), a check valve (9.4), an accumulator (9.5), a descending proportional solenoid valve (9.6) and a lifting solenoid valve (9.7) connected in sequence through the oil pipe; an electric pilot handle (11) for controlling the opening and closing of the descending proportional solenoid valve (9.6) and the lifting solenoid valve (9.7) is provided in the cab; the main control valve (15) comprises a lifting position, a descending position, a stop position and a floating position; When the cargo compartment is lifted, the hydraulic pump (17) works, the electric pilot handle (11) controls the lifting solenoid valve (9.7) to be energized, the lifting solenoid valve (9.7) controls the lifting main control valve (15) to be in the lifting position, the piston rod of the lifting oil cylinder (13) extends, and the cargo compartment is lifted; When the cargo compartment is lowered, the hydraulic pump (17) works, the electric pilot handle (11) controls the lowering proportional solenoid valve (9.6) to be energized, the lowering proportional solenoid valve (9.6) controls the lifting main control valve (15) to be in the lowering position, the piston rod of the lifting oil cylinder (13) is retracted, and the cargo compartment realizes the lowering action; When the cargo compartment stops operating, the lowering proportional solenoid valve (9.6) and the lifting solenoid valve (9.7) are both de-energized, the main control valve (15) is in the stop position, and the cargo compartment stops moving; When the cargo compartment is in floating operation, the hydraulic pump (17) works, and the descending proportional solenoid valve (9.6) continuously outputs hydraulic oil with a constant pressure value, so that the lifting main control valve (15) is in a floating position.

2. A rigid dump truck lifting system as claimed in claim 1, characterized in that: A safety valve (9.3) is provided between the pressure reducing valve (9.2) and the one-way valve (9.4), and a pressure measuring joint (10) is also provided between the pressure reducing valve (9.2) and the one-way valve (9.4).

3. A rigid dump truck lifting system as claimed in claim 1, characterized in that: A balance valve (14) is provided on the oil pipe between the lifting oil cylinder (13) and the main control valve (15).

4. A rigid dump truck lifting system as claimed in claim 1, characterized in that: The oil pipe between the descending proportional solenoid valve (9.6) and the main control valve (15) is provided with a pressure sensor (12).

5. A rigid dump truck lifting system as claimed in claim 1, characterized in that: A filter (3) and a hydraulic system radiator (5) are arranged in sequence between the output end of the main control valve (15) and the oil tank (16), and a temperature sensor (4) is arranged between the filter (3) and the hydraulic system radiator (5).

6. A rigid dump truck lifting system as claimed in claim 5, characterized in that: A first transition block (2) is provided between the main control valve (15) and the input end of the filter (3), and a bypass valve group (1) is provided between the first transition block (2) and the oil tank (16).

7. A lifting system for a rigid dump truck as claimed in claim 5, characterized in that: A second transition block (8), a wet bridge (7) and a third transition block (6) are sequentially arranged between the output end of the hydraulic system radiator (5) and the oil tank (16).

8. A rigid dump truck lifting system as claimed in claim 1, characterized in that: An air filter (19) is provided on the oil tank (16).

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