Improved front jacking hydraulic oil cylinder control system for dump truck

Abstract

The utility model discloses an improved front jacking hydraulic oil cylinder control system for a dumper. The improved front jacking hydraulic oil cylinder control system comprises an oil tank, an oil pump, a slow-descending pneumatic control reversing valve, a manual-control slow-descending reversing valve, a limiting valve, a front jacking hydraulic oil cylinder, an anti-explosion valve, an oil pipe, an air pipe and an air storage cylinder. Wherein the oil tank is respectively connected with the oil pump and the slow-descending pneumatic control reversing valve, the oil pump is connected with the slow-descending pneumatic control reversing valve, the slow-descending pneumatic control reversing valve is connected with the front jacking hydraulic oil cylinder through an oil pipe, the manual-control slow-descending reversing valve is connected with the slow-descending pneumatic control reversing valve through an air pipe, and the limit valve is respectively connected with the slow-descending pneumatic control reversing valve and the manual-control slow-descending reversing valve. The air storage cylinder is connected with the manual-control slow-descending reversing valve, and the anti-explosion valve is arranged between the slow-descending pneumatic-control reversing valve and the front jacking hydraulic oil cylinder and connected with the oil pipe. The front jacking hydraulic oil cylinder has the advantages that the front jacking hydraulic oil cylinder is prevented from falling down quickly due to stall and being broken; and rollover of the dumper carriage caused by breakage of the front jacking hydraulic oil cylinder and manual injury of a driver caused by rollover of the dumper carriage are avoided.

Description

Technical Field

[0001] This utility model relates to the field of front-mounted hydraulic cylinder control technology for dump trucks, specifically to an improved control system for the front-mounted hydraulic cylinder of a dump truck. Background Technology

[0002] Existing front-mounted hydraulic cylinder control systems for dump trucks, such as Figure 1 As shown, its hydraulic circuit typically lacks any explosion-proof devices, such as explosion-proof valves. When the oil pipe 8 ruptures, the front hydraulic cylinder 7 in its hydraulic circuit will usually stall and rapidly descend, thus breaking the front hydraulic cylinder 7. Furthermore, the breakage of the front hydraulic cylinder 7 can easily lead to the dump truck's cargo box tipping over, and this can also cause significant injury to the driver inside the cab due to the cargo box tipping over. Utility Model Content

[0003] The purpose of this utility model is to provide an improved front-mounted hydraulic cylinder control system for dump trucks, which solves the technical problems existing in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An improved control system for a front-mounted hydraulic cylinder of a dump truck includes an oil tank, an oil pump, a slow-descent pneumatic directional valve, a manually controlled slow-descent directional valve, a limit valve, a front-mounted hydraulic cylinder, oil pipes, air pipes, and an air reservoir. The oil tank is connected to both the oil pump and the slow-descent pneumatic directional valve. The oil pump is connected to the slow-descent pneumatic directional valve. The slow-descent pneumatic directional valve is connected to the front-mounted hydraulic cylinder via an oil pipe. The manually controlled slow-descent directional valve is connected to the slow-descent pneumatic directional valve via an air pipe. The limit valve is connected to both the slow-descent pneumatic directional valve and the manually controlled slow-descent directional valve. The air reservoir is connected to the manually controlled slow-descent directional valve. The system also includes an explosion-proof valve, which is positioned between the slow-descent pneumatic directional valve and the front-mounted hydraulic cylinder and connected to the oil pipes.

[0006] Furthermore, the explosion-proof valve is a one-way explosion-proof valve, which includes an oil inlet D and an oil outlet C. The oil inlet D is connected to an oil pipe, and the oil outlet C is connected to the oil inlet of the front hydraulic cylinder.

[0007] Furthermore, the manually controlled slow-descent reversing valve consists of a first manually controlled slow-descent reversing valve and a second manually controlled slow-descent reversing valve. The high-pressure outlet A of the first manually controlled slow-descent reversing valve is connected to the slow-descent port of the slow-descent pneumatic reversing valve via a slow-descent air pipe. The high-pressure outlet A of the second manually controlled slow-descent reversing valve is connected to the inlet P of the limit valve via a first lifting air pipe. The high-pressure outlet A of the limit valve is connected to the lifting port of the slow-descent pneumatic reversing valve via a second lifting air pipe. The high-pressure outlet B of the second manually controlled slow-descent reversing valve is connected to the descent port of the slow-descent pneumatic reversing valve via an air pipe. The inlet P of the first manually controlled slow-descent reversing valve and the inlet P of the second manually controlled slow-descent reversing valve are connected in parallel and communicate with the air storage tank via an inlet pipe. The return port O of the first manually controlled slow-descent reversing valve and the return port O of the second manually controlled slow-descent reversing valve are connected in parallel and communicate with the external atmosphere via an outlet pipe.

[0008] Compared with the prior art, the advantages of this utility model are as follows:

[0009] (1) It avoids the front hydraulic cylinder from falling rapidly due to stall, which could lead to breakage;

[0010] (2) It avoids the accident of the dump truck body overturning due to the breakage of the front hydraulic cylinder;

[0011] (3) It avoids the driver from being injured in a dump truck accident caused by the dump truck's cargo box overturning. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in this embodiment, the accompanying drawings used in the description of the embodiment will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the existing front-mounted hydraulic cylinder control system for dump trucks;

[0014] Figure 2 This is a schematic diagram of the improved front-mounted hydraulic cylinder control system for dump trucks provided by this utility model;

[0015] Explanation of reference numerals in the attached diagram: 1. Oil tank; 2. Oil pump; 3. Slow-descent pneumatic directional valve; 4. Manually controlled slow-descent directional valve; 5. Limit valve; 6. Explosion-proof valve; 7. Front lifting hydraulic cylinder; 8. Oil pipe; 9. Air pipe; 10. Air reservoir; 11. Slow-descent air pipe; 12. First lifting air pipe; 13. Second lifting air pipe; 14. Air inlet pipe; 15. Air outlet pipe.

[0016] exist Figure 1 and Figure 2In the diagram, the thick solid line represents the hydraulic oil circuit, and the thin solid line represents the pneumatic control circuit. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. In addition, the appearance of the term "horizontal" does not mean that the component is required to be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0020] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] The present invention will be further described below with reference to the accompanying drawings:

[0022] like Figure 2As shown, the improved front-mounted hydraulic cylinder control system for dump trucks provided by this utility model includes an oil tank 1, an oil pump 2, a slow-descent pneumatic control directional valve 3, a manual slow-descent directional valve 4, a limit valve 5, an explosion-proof valve 6, a front-mounted hydraulic cylinder 7, an oil pipe 8, an air pipe 9, and an air reservoir 10. The oil tank 1 is connected to both the oil pump 2 and the slow-descent pneumatic control directional valve 3. The oil pump 2 is connected to the slow-descent pneumatic control directional valve 3. The slow-descent pneumatic control directional valve 3 is connected to the front-mounted hydraulic cylinder 7 via the oil pipe 8. The manual slow-descent directional valve 4 is connected to the slow-descent pneumatic control directional valve 3 via the air pipe 9. The limit valve 5 is connected to both the slow-descent pneumatic control directional valve 3 and the manual slow-descent directional valve 4. The air reservoir 10 is connected to the manual slow-descent directional valve 4. The explosion-proof valve 6 is located between the slow-descent pneumatic control directional valve 3 and the front-mounted hydraulic cylinder 7 and is connected to the oil pipe 8.

[0023] Specifically, such as Figure 2 As shown, the explosion-proof valve 6 is a one-way explosion-proof valve, containing an inlet D and an outlet C. The inlet D is connected to the oil pipe 8, and the outlet C is connected to the inlet of the front lifting hydraulic cylinder 7. The working principle of the explosion-proof valve 6 is as follows: In the hydraulic oil circuit, when the hydraulic oil flows through the explosion-proof valve 6 at a set value, the explosion-proof valve 6 is normally open, regardless of whether the hydraulic oil flows from the inlet D to the outlet C or from the outlet C to the inlet D. When the oil pipe 8 ruptures or the pipe joint falls off, the hydraulic oil flow from the outlet C to the inlet D will surge sharply, exceeding the set value. At this time, the explosion-proof valve 6 will automatically become a one-way valve, and the hydraulic oil cannot flow from the outlet C to the inlet D. At this time, the front lifting hydraulic cylinder 7 cannot descend, thus ensuring that the front lifting hydraulic cylinder 7 is in a safe lifting state, and the dump truck box is also in a safe lifting state at the same time.

[0024] Specifically, such as Figure 2 As shown, the manual slow-descent reversing valve 4 consists of a first manual slow-descent reversing valve 401 and a second manual slow-descent reversing valve 402. The high-pressure outlet A of the first manual slow-descent reversing valve 401 is connected to the slow-descent port of the slow-descent pneumatic reversing valve 3 via a slow-descent air pipe 11. The high-pressure outlet A of the second manual slow-descent reversing valve 402 is connected to the inlet P of the limit valve 5 via a first lifting air pipe 12. The high-pressure outlet A of the limit valve 5 is connected to the slow-descent pneumatic reversing valve via a second lifting air pipe 13. The lifting air port of valve 3 is connected, and the high-pressure air outlet B of the second manual slow descent reversing valve 402 is connected to the descent air port of the slow descent pneumatic reversing valve 3 through the air pipe 9. The air inlet P of the first manual slow descent reversing valve 401 is connected in parallel with the air inlet P of the second manual slow descent reversing valve 402, and is connected to the air storage tank 10 through the air inlet pipe 14. The air return port O of the first manual slow descent reversing valve 401 is connected in parallel with the air return port O of the second manual slow descent reversing valve 402, and is connected to the external atmosphere through the air outlet pipe 15.

[0025] Specifically, the slow-descent pneumatic control directional valve is preferably the 34MQK-E20L slow-descent pneumatic control directional valve.

[0026] Specifically, the manual slow-descent reversing valve 4 is preferably the KQF34-E manual slow-descent reversing air valve.

[0027] Specifically, the limit valve 5 is preferably an XQF22 limit air valve.

[0028] Compared with existing front-mounted hydraulic cylinder control systems for dump trucks, the improved front-mounted hydraulic cylinder control system for dump trucks provided by this utility model has the following main advantages:

[0029] (1) The explosion-proof valve 6 added to the hydraulic circuit can protect the front hydraulic cylinder 7 from falling rapidly due to stall, thereby breaking the front hydraulic cylinder 7.

[0030] (2) The explosion-proof valve 6 added to the hydraulic circuit can protect the dump truck from overturning due to the breakage of the front hydraulic cylinder 7.

[0031] (3) The explosion-proof valve 6 added to the hydraulic circuit can protect the driver in the cab from injury in the event of a rollover accident.

[0032] Finally, it should be noted that the above description is only an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An improved control system for a front-mounted hydraulic cylinder of a dump truck, comprising an oil tank (1), an oil pump (2), a slow-descent pneumatic directional valve (3), a manual slow-descent directional valve (4), a limit valve (5), a front-mounted hydraulic cylinder (7), an oil pipe (8), an air pipe (9), and an air reservoir (10), wherein the oil tank (1) is connected to the oil pump (2) and the slow-descent pneumatic directional valve (3) respectively, the oil pump (2) is connected to the slow-descent pneumatic directional valve (3), the slow-descent pneumatic directional valve (3) is connected to the front-mounted hydraulic cylinder (7) via the oil pipe (8), the manual slow-descent directional valve (4) is connected to the slow-descent pneumatic directional valve (3) via the air pipe (9), the limit valve (5) is connected to the slow-descent pneumatic directional valve (3) and the manual slow-descent directional valve (4) respectively, and the air reservoir (10) is connected to the manual slow-descent directional valve (4), characterized in that: It also includes an explosion-proof valve (6), which is located between the slow-descent pneumatic directional valve (3) and the front-mounted hydraulic cylinder (7) and is connected to the oil pipe (8).

2. The improved front-mounted hydraulic cylinder control system for dump trucks according to claim 1, characterized in that: The explosion-proof valve (6) is a one-way explosion-proof valve, which includes an oil inlet D and an oil outlet C. The oil inlet D is connected to the oil pipe (8), and the oil outlet C is connected to the oil inlet of the front hydraulic cylinder (7).

3. The improved front-mounted hydraulic cylinder control system for dump trucks according to claim 1, characterized in that: The manual slow-descent reversing valve (4) consists of a first manual slow-descent reversing valve (401) and a second manual slow-descent reversing valve (402). The high-pressure outlet A of the first manual slow-descent reversing valve (401) is connected to the slow-descent port of the slow-descent pneumatic reversing valve (3) via a slow-descent air pipe (11). The high-pressure outlet A of the second manual slow-descent reversing valve (402) is connected to the inlet P of the limit valve (5) via a first lifting air pipe (12). The high-pressure outlet A of the limit valve (5) is connected to the slow-descent pneumatic reversing valve (402) via a second lifting air pipe (13). 3) The lifting air port is connected, and the high pressure outlet B of the second manual slow descent reversing valve (402) is connected to the descent air port of the slow descent air control reversing valve (3) through the air pipe (9). The air inlet P of the first manual slow descent reversing valve (401) is connected in parallel with the air inlet P of the second manual slow descent reversing valve (402), and is connected to the air storage cylinder (10) through the air inlet pipe (14). The return air port O of the first manual slow descent reversing valve (401) is connected in parallel with the return air port O of the second manual slow descent reversing valve (402), and is connected to the external atmosphere through the air outlet pipe (15).

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