Hydraulic system of dumper

Abstract

The hydraulic system comprises a hydraulic oil tank, a hydraulic oil cylinder A, a hydraulic oil cylinder B and a hydraulic oil cylinder C. The hydraulic oil cylinder A is connected with a box body of the dumper, the hydraulic oil cylinder B and the hydraulic oil cylinder C are connected with the left side and the right side of a tail door, and the hydraulic oil cylinder A, the hydraulic oil cylinder B and the hydraulic oil cylinder C are controlled by a control valve A to stretch and retract. And a sequence valve is arranged between the control valve A and the hydraulic oil cylinder A, so that the sequence logic that the tail door is opened firstly and then the box body is lifted when the dump truck unloads is determined. The device is reasonable in structural design, the sequential logic that the tail door is opened firstly and then the box body is lifted is determined in the system, the situation that the box body is lifted before the tail door is opened can be effectively avoided, therefore, accidents and economic losses are avoided, operation is simpler, and the requirement for a driver is lower.

Description

Technical Field

[0001] This utility model relates to the field of dump truck technology, and in particular to a hydraulic system for a dump truck. Background Technology

[0002] The existing hydraulic control system for opening and closing the tailgate and raising and lowering the cargo box typically consists of a hydraulic oil tank, oil pump, hydraulic cylinders A, B, and C, hydraulic pipes, relief valve, control valve A, and control valve B. Hydraulic cylinder A connects to the cargo box and controls its raising and lowering. Hydraulic cylinders B and C connect to the left and right sides of the tailgate, jointly controlling its opening and closing. Control valve A controls the extension and retraction of hydraulic cylinder A; control valve B controls the extension and retraction of hydraulic cylinders B and C. When a fully loaded dump truck needs to unload, control valve B extends hydraulic cylinders B and C, opening the tailgate. Then, control valve A extends hydraulic cylinder A, raising the cargo box and allowing the material to be unloaded.

[0003] First, open the tailgate, then raise the cargo box. This sequence must be correct. If the tailgate is not open when raising the cargo box, the vehicle may overturn. This requires the driver to strictly follow the sequence. However, in reality, it often happens that the cargo box is raised before the tailgate is open, resulting in the vehicle tilting or even overturning, posing a safety hazard. To address this, we designed a hydraulic system for dump trucks to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to solve the problems existing in the prior art and to propose a hydraulic system for dump trucks. It provides a hydraulic system for dump trucks that determines the logical sequence of opening the tailgate first and then lifting the box body, so as to avoid the situation where the box body is lifted before the tailgate is opened and avoid accidents.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A hydraulic system for a dump truck includes a hydraulic oil tank, hydraulic cylinder A, hydraulic cylinder B, and hydraulic cylinder C. Hydraulic cylinder A is connected to the dump truck body, and hydraulic cylinders B and C are connected to the left and right sides of the tailgate. The extension and retraction of hydraulic cylinders A, B, and C are controlled by a control valve A. A sequence valve is provided between the control valve A and hydraulic cylinder A to determine the logical sequence of opening the tailgate first and then lifting the dump truck body when unloading.

[0007] Preferably, the hydraulic oil tank is connected to hydraulic cylinders A, B, and C via hydraulic pipes.

[0008] Preferably, an oil pump is installed on the hydraulic pipe to draw hydraulic oil from the hydraulic oil tank.

[0009] Preferably, an overflow valve is installed on the hydraulic pipe.

[0010] Preferably, the pressure opening value of the sequence valve is adjustable.

[0011] Preferably, the hydraulic pipe is divided into a first branch pipe connected to hydraulic cylinder A and a second branch pipe connected to hydraulic cylinders B and C, and the sequence valve is installed on the first branch pipe.

[0012] Compared with the prior art, the advantages of this utility model are as follows:

[0013] 1. Compared with existing dump trucks, the hydraulic system of this dump truck has a defined sequence logic of opening the tailgate before lifting the box, which can effectively prevent the box from being lifted before the tailgate is opened, thereby avoiding accidents and economic losses. It is also simpler to operate and requires less skill from the driver. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the hydraulic system of a dump truck proposed in this utility model;

[0015] Figure 2 This is a schematic diagram of the hydraulic system of a current technology dump truck.

[0016] In the diagram: 1. Hydraulic oil tank; 2. Hydraulic cylinder A; 3. Hydraulic cylinder B; 4. Hydraulic cylinder C; 5. Control valve A; 6. Sequence valve; 7. Hydraulic pipe; 701. First branch pipe; 702. Second branch pipe; 8. Oil pump; 9. Relief valve. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Reference Figure 1A hydraulic system for a dump truck includes a hydraulic oil tank 1, hydraulic cylinder A 2, hydraulic cylinder B 3, and hydraulic cylinder C 4. Hydraulic cylinder A 2 is connected to the dump truck body, and hydraulic cylinders B 3 and C 4 are connected to the left and right sides of the tailgate. Hydraulic cylinders A 2, B 3, and C 4 are controlled to extend and retract by control valve A 5. A sequence valve 6 is provided between control valve A 5 and hydraulic cylinder A 2 to determine the sequential logic of opening the tailgate first and then lifting the body when the dump truck is unloading, thus avoiding the situation where the body is lifted before the side door is opened, and preventing accidents. This hydraulic system is especially needed for side-tipping dump trucks. If the side door is closed when the body is lifted to the side, the center of gravity of the whole vehicle changes, and it is very easy to tip over.

[0019] Hydraulic oil tank 1 is connected to hydraulic cylinders A 2, B 3, and C 4 via hydraulic pipe 7. An oil pump 8 is installed on hydraulic pipe 7 to draw hydraulic oil from the hydraulic oil tank 1. An overflow valve 9 is installed on hydraulic pipe 7. The overflow valve 9 plays a safety protection role in the system. When the system pressure exceeds the specified value, the safety valve opens to prevent the system pressure from exceeding the allowable value, thereby ensuring that the system does not have an accident due to excessive pressure.

[0020] The pressure opening value of the sequence valve 6 is adjustable. If it is found that hydraulic cylinders B 3, C 4, and A 2 extend at the same time, the pressure opening value of the sequence valve 6 is increased until the sequence of hydraulic cylinders B 3 and C 4 extending first, followed by hydraulic cylinder A 2 is satisfied.

[0021] Hydraulic pipe 7 is divided into a first branch pipe 701 connected to hydraulic cylinder A 2 and a second branch pipe 702 connected to hydraulic cylinder B 3 and hydraulic cylinder C 4. Sequence valve 6 is installed on the first branch pipe 701, so that hydraulic oil can first flow through hydraulic pipe 7 and second branch pipe 702 to hydraulic cylinder B 3 and hydraulic cylinder C 4, and then flow into hydraulic cylinder A 2 through sequence valve 6, so as to perform the sequential logic of opening the side door first and then lifting the box.

[0022] The functional principle of this utility model can be explained through the following operation methods:

[0023] In this invention, the sequence valve 6 in the system is set with a pressure opening value according to the actual working conditions. This ensures that when the A control valve 5 controls the extension of hydraulic cylinders B, C, and A, hydraulic cylinders 3 and 4 must extend first. Then, the pressure in the hydraulic pipe 7 continues to rise until it reaches the opening pressure of the sequence valve 6. Hydraulic oil then enters hydraulic cylinder A, causing it to extend. If all three cylinders (B, C, and A) extend simultaneously, the pressure opening value of the sequence valve 6 is increased until the sequence of extension of hydraulic cylinders B, C, and A is satisfied. This establishes the logical sequence of opening the tailgate before lifting the dump truck body during unloading, preventing the situation where the tailgate is not opened before lifting the body and thus avoiding accidents.

[0024] When a fully loaded dump truck needs to unload, control valve A 5 controls hydraulic cylinders B 3 and C 4 to extend, which opens the tailgate. Then, sequence valve 6 opens, hydraulic cylinder A 2 extends, and the container is lifted, allowing the material inside to be unloaded.

[0025] After unloading is completed, control valve 5 controls hydraulic cylinders 3, 4, and 2 to retract, thus closing the tailgate and lowering the box.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A hydraulic system of a self-dumping car comprising a hydraulic oil tank (1), an A hydraulic oil cylinder (2), a B hydraulic oil cylinder (3), and a C hydraulic oil cylinder (4), characterized in that, The A hydraulic cylinder (2) is connected with the dump truck body, the B hydraulic cylinder (3) and the C hydraulic cylinder (4) are connected with the left and right sides of the tail door, the A hydraulic cylinder (2), the B hydraulic cylinder (3) and the C hydraulic cylinder (4) are controlled to extend and contract by the A control valve (5), and the A control valve (5) is provided with a sequence valve (6) between the A hydraulic cylinder (2), so that the sequence logic that the tail door is opened first and then the body is lifted when the dump truck is unloading is determined.

2. A hydraulic system for a dump truck as defined in claim 1, wherein The hydraulic oil tank (1) is connected with the A hydraulic cylinder (2), the B hydraulic cylinder (3) and the C hydraulic cylinder (4) through the hydraulic pipe (7).

3. A hydraulic system for a dump truck as defined in claim 2, wherein The oil pump (8) is installed on the hydraulic pipe (7) to suck the hydraulic oil in the hydraulic oil tank (1).

4. A hydraulic system for a dump truck as defined in claim 2, wherein The overflow valve (9) is installed on the hydraulic pipe (7).

5. A hydraulic system for a dump truck as defined in claim 1 wherein, The pressure opening value of the sequence valve (6) is adjustable.

6. A hydraulic system for a dump truck as defined in claim 2, wherein, The hydraulic pipe (7) is divided into the first branch pipe (701) connected with the A hydraulic cylinder (2) and the second branch pipe (702) connected with the B hydraulic cylinder (3) and the C hydraulic cylinder (4), and the sequence valve (6) is installed on the first branch pipe (701).

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