Closed winch hydraulic system and crane

Abstract

The utility model discloses a closed type winch hydraulic system and a crane, belongs to the technical field of engineering machinery, and aims to solve the problems that after the existing closed type winch hydraulic system works for a long time, the oil temperature in the system is too high, a hydraulic pump and a winch motor are easy to damage, and the crane fails. The system comprises a hydraulic pump, a winch motor and a heat balance control valve, a first oil port of the hydraulic pump is connected with a falling port of the winch motor, a second oil port of the hydraulic pump is connected with a starting port of the winch motor, an oil supplementing port of the hydraulic pump is connected with a first oil supplementing mechanism through an oil supplementing oil way, and an oil inlet of the heat balance control valve is connected with the falling port through a bypass oil way. An oil return port of the heat balance control valve is connected with the oil tank; according to the utility model, the oil temperature of the closed winch system can be effectively reduced, so that the problem that the oil temperature is too high when the closed winch system works for a long time is solved, the damage to the hydraulic pump and the winch motor is avoided, and the working effect of the crane is ensured.

Description

Technical Field

[0001] The utility model relates to a closed winch hydraulic system and a crane, belonging to the technical field of engineering machinery. Background Art

[0002] Closed-loop hydraulic transmissions are widely used in the winch systems of large-tonnage cranes due to their high power-to-weight ratio, compact size, smooth transmission, stepless speed regulation with a wide speed range, and convenient electronic control. However, the hydraulic oil in these systems primarily circulates within a closed loop, resulting in poor heat dissipation. Compared to open-loop systems, the problem of excessive oil temperatures in closed systems is more prominent. Due to the long hours of hoisting and lowering heavy objects, the system's hydraulic oil temperature rises, even reaching the system's thermal equilibrium point above 130°C. This can cause the load to become immobile in mid-air and prevent further lifting. Sometimes the system must be shut down for cooling before resuming the hoisting operation. Even more serious is damage to the winch pump or motor, causing the crane to shut down.

[0003] After the existing closed winch hydraulic system has been working for a long time, the oil temperature in the system is too high, which can easily cause damage to the hydraulic pump and winch motor, thereby causing crane failure and affecting the working effect of the crane. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a closed hoisting hydraulic system and a crane to solve the problem that after the existing closed hoisting hydraulic system has been working for a long time, the oil temperature in the system is too high, which easily causes damage to the hydraulic pump and the hoisting motor, thereby causing crane failure.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, the utility model provides a closed winch hydraulic system, comprising a hydraulic pump, a winch motor, and a heat balance control valve, wherein a first oil port of the hydraulic pump is connected to a drop port of the winch motor, a second oil port of the hydraulic pump is connected to a start port of the winch motor, an oil replenishment port of the hydraulic pump is connected to a first oil replenishment mechanism via an oil replenishment oil circuit, an oil inlet of the heat balance control valve is connected to the drop port via a bypass oil circuit, and an oil return port of the heat balance control valve is connected to a fuel tank;

[0007] The heat balance control valve includes a one-way damping valve, and the oil inlet is connected to the oil return port through the one-way damping valve.

[0008] Furthermore, the thermal balance control valve further includes a solenoid valve, and the oil inlet is connected to the oil return port via the solenoid valve and the one-way damping valve in sequence.

[0009] Furthermore, the solenoid valve is a two-position two-way solenoid valve.

[0010] Furthermore, the hoisting motor is connected to the oil tank through a first oil drain port.

[0011] Furthermore, the hydraulic pump is connected to the oil tank through a second oil drain port.

[0012] Furthermore, it also includes a second oil replenishing mechanism, which is connected to the drop port through an auxiliary oil circuit.

[0013] Furthermore, both the oil replenishing circuit and the auxiliary oil circuit are provided with a one-way valve.

[0014] Furthermore, the first oil replenishing mechanism includes a first oil replenishing pump, and the oil replenishing oil circuit is connected to the oil tank through the first oil replenishing pump.

[0015] Furthermore, the second oil replenishing mechanism includes a second oil replenishing pump, and the auxiliary oil circuit is connected to the oil tank through the second oil replenishing pump.

[0016] In a second aspect, the present invention provides a crane comprising the closed hoisting hydraulic system described in the first aspect.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The closed hoist hydraulic system works in conjunction with the oil supply line and the heat balance control valve. When the hoist motor is working for a long time, high-temperature hydraulic oil in the closed hoist system will flow back to the oil tank through the heat balance control valve, and low-temperature hydraulic oil will be replenished into the system through the oil supply line. This effectively reduces the oil temperature of the closed hoist system, thereby solving the problem of high oil temperature caused by long-term operation of the closed hoist system, avoiding damage to the hydraulic pump and hoist motor, and ensuring the working effect of the crane.

[0019] 2. The thermal balance control valve of the present application is connected to the drop port of the winch motor, which can effectively avoid the occurrence of safety hazards. During the actual use of the winch system, whether the winch is lifting or lowering, the opening of the winch motor is a high-pressure port and the drop port is a low-pressure port. The hydraulic oil at the opening needs to lift or lower the heavy object, so the bypass oil circuit position is locked on the drop port side. When the thermal balance control valve fails, there will be no safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a connection diagram of a closed winch hydraulic system provided according to an embodiment of the utility model.

[0021] In the figure: 1. Thermal balance control valve; 2. Winch motor; 3. Hydraulic pump; 4. One-way valve; 10. Bypass oil circuit; 11. Solenoid valve; 12. One-way damping valve; 13. Oil inlet; 14. Oil return port; 20. Auxiliary oil circuit; 21. Drop port; 22. Start port; 23. Oil replenishment circuit; 31. First oil port; 32. Second oil port. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0024] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances. Example 1:

[0025] like Figure 1As shown, the utility model provides a closed winch hydraulic system, including a hydraulic pump 3, a winch motor 2 and a thermal balance control valve 1, the first oil port 31 of the hydraulic pump 3 is connected to the drop port 21 of the winch motor 2, the second oil port 32 of the hydraulic pump 3 is connected to the start port 22 of the winch motor 2, the oil replenishment port of the hydraulic pump 3 is connected to the first oil replenishment mechanism through the oil replenishment oil circuit 23, the oil inlet 13 of the thermal balance control valve 1 is connected to the drop port 21 through the bypass oil circuit 10, and the oil return port 14 of the thermal balance control valve 1 is connected to the oil tank; the thermal balance control valve 1 includes a one-way damping valve 12, and the oil inlet 13 is connected to the oil return port 14 through the one-way damping valve 12.

[0026] When the hydraulic system is running, the first oil replenishing mechanism cooperates with the oil replenishing circuit 23 to replenish oil for the entire hydraulic system; when working, when the winch is raised, the second oil port 32 is used to supply oil, and the first oil port 31 is used to return oil, the starting port 22 takes in oil, and the falling port 21 returns oil. At this time, when the falling port 21 returns oil, a part of the hydraulic oil will flow through the bypass oil circuit 10 through the heat balance control valve 1 and return to the oil tank. At this time, the first oil replenishing mechanism and the oil replenishing circuit 23 will replenish oil to the system through the oil replenishing port of the hydraulic pump 3. Since the bypass oil circuit 10 flows out of the high-temperature oil in the hydraulic system, and the oil replenishing circuit 23 replenishes the hydraulic oil with a lower temperature, the hydraulic oil temperature of the entire closed winch system can be effectively reduced. Similarly, when the winch falls, the first oil port 31 is used to supply oil, and the second oil port 32 is used to return oil, the falling port 21 takes in oil, and the starting port 22 returns oil. When oil is taken into the drop port 21, a part of the hydraulic oil will flow through the bypass oil circuit 10 through the thermal balance control valve 1 and return to the oil tank. At this time, the oil replenishment circuit 23 will replenish the system, so the high-temperature hydraulic oil in the system will also flow out when the winch falls; this application cooperates with the oil replenishment circuit 23 and the thermal balance control valve 1. When the winch motor 2 works for a long time, the closed winch system always has high-temperature hydraulic oil flowing back to the oil tank through the thermal balance control valve 1, and low-temperature hydraulic oil is replenished into the system through the oil replenishment circuit 23. The oil temperature of the closed winch system can be effectively reduced, thereby solving the problem of excessively high oil temperature of the closed winch system when working for a long time, avoiding damage to the hydraulic pump 3 and the winch motor 2, and ensuring the working effect of the crane; the thermal balance control valve 1 includes a one-way damping valve 12 to prevent the hydraulic oil from flowing back from the oil tank, thereby ensuring the stability of this system during operation.

[0027] The thermal balance control valve 1 of the present application is connected to the drop port 21 of the winch motor 2, which can effectively avoid the occurrence of safety hazards. During the actual use of the winch system, whether it is winching up or down, the start port 22 of the winch motor 2 is a high-pressure port, and the drop port 21 is a low-pressure port. The hydraulic oil in the start port 22 needs to support the heavy objects to lift or fall, so the position of the bypass oil circuit 10 is locked on the drop port 21 side. When the thermal balance control valve 1 fails, there will be no safety hazards.

[0028] In one embodiment, the thermal balance control valve 1 also includes a solenoid valve 11, and the oil inlet 13 is connected to the oil return port 14 through the solenoid valve 11 and the one-way damping valve 12 in sequence. The solenoid valve 11 can control the on-off between the one-way damping valve 12 and the bypass oil circuit 10; when the oil temperature in the system is low, the solenoid valve 11 can be closed, and when the oil temperature in the system is high, the solenoid valve 11 can be opened, so that the high-temperature hydraulic oil can enter the oil tank through the thermal balance control valve 1; optionally, the solenoid valve 11 is a two-position two-way solenoid valve, or a two-position three-way solenoid valve or an electric proportional solenoid valve.

[0029] In one embodiment, the hoisting motor 2 is connected to the oil tank through a first oil drain port, and the hydraulic pump 3 is connected to the oil tank through a second oil drain port. The hoisting motor 2 leaks part of the hydraulic oil to the oil tank through the first oil drain port, and the hydraulic pump 3 leaks part of the hydraulic oil to the oil tank through the second oil drain port. The oil replenishing circuit 23 replenishes the leaked hydraulic oil at the same time, and further reduces the temperature of the hydraulic oil in the system.

[0030] One embodiment further includes a second oil replenishing mechanism, which is connected to the drop port 21 through an auxiliary oil circuit 20. When the hoisting motor 2 falls too fast and the hydraulic oil provided by the oil replenishing circuit 23 is insufficient to meet the needs of the hydraulic system, the auxiliary oil circuit 20 will replenish oil to the hydraulic system to prevent the hoisting motor 2 from stalling when falling, thereby protecting the system; optionally, a one-way valve 4 is provided on the oil replenishing circuit 23 and the auxiliary oil circuit 20, and the one-way valve 4 is used to prevent the hydraulic oil in the system from flowing back through the oil replenishing circuit 23 or the auxiliary oil circuit 20, thereby ensuring the stability of the system during operation; further, the oil replenishing port of the hydraulic pump 3 is integrated with the function of the one-way valve 4.

[0031] In one embodiment, the first oil replenishing mechanism includes a first oil replenishing pump, the oil replenishing oil circuit 23 is connected to the oil tank through the first oil replenishing pump, and the second oil replenishing mechanism includes a second oil replenishing pump, and the auxiliary oil circuit 20 is connected to the oil tank through the second oil replenishing pump; when the first oil replenishing pump and the second oil replenishing pump start working, the low-temperature oil in the oil tank is sent into the system through the oil replenishing oil circuit 23 and the auxiliary oil circuit 20, thereby cooling the high-temperature oil in the system, and the high-temperature oil in the system enters the oil tank through the bypass oil circuit 10 and the heat balance control valve 1, and is mixed with the low-temperature oil in the oil tank and then cooled, so as to facilitate the oil replenishing work of the first oil replenishing pump and the second oil replenishing pump, thereby ensuring the cooling effect on the hydraulic oil of the system.

[0032] The closed hoisting system heat balance control valve 1 of the present application has a simple structure, low cost, easy installation, and is easy to use and promote. Example 2:

[0033] The utility model provides a crane, comprising the closed hoisting hydraulic system described in the first embodiment.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A closed winch hydraulic system, characterized in that: It comprises a hydraulic pump (3), a hoisting motor (2) and a heat balance control valve (1), wherein the first oil port (31) of the hydraulic pump (3) is connected to the drop port (21) of the hoisting motor (2), the second oil port (32) of the hydraulic pump (3) is connected to the start port (22) of the hoisting motor (2), the oil replenishment port of the hydraulic pump (3) is connected to the first oil replenishment mechanism via an oil replenishment oil circuit (23), the oil inlet (13) of the heat balance control valve (1) is connected to the drop port (21) via a bypass oil circuit (10), and the oil return port (14) of the heat balance control valve (1) is connected to the oil tank; The heat balance control valve (1) comprises a one-way damping valve (12), and the oil inlet (13) is connected to the oil return port (14) via the one-way damping valve (12).

2. The closed winch hydraulic system according to claim 1, characterized in that: The heat balance control valve (1) further comprises a solenoid valve (11), and the oil inlet (13) is connected to the oil return port (14) via the solenoid valve (11) and the one-way damping valve (12) in sequence.

3. The closed winch hydraulic system according to claim 2, characterized in that: The solenoid valve (11) is a two-position two-way solenoid valve.

4. The closed winch hydraulic system according to claim 1, characterized in that: The hoisting motor (2) is connected to the oil tank via a first oil drain port.

5. The closed winch hydraulic system according to claim 1, characterized in that: The hydraulic pump (3) is connected to the oil tank via a second oil drain port.

6. The closed winch hydraulic system according to claim 1, characterized in that: It also includes a second oil replenishing mechanism, which is connected to the drop port (21) via an auxiliary oil circuit (20).

7. The closed winch hydraulic system according to claim 6, characterized in that: Both the oil replenishment circuit (23) and the auxiliary oil circuit (20) are provided with a one-way valve (4).

8. The closed winch hydraulic system according to claim 1, characterized in that: The first oil replenishment mechanism includes a first oil replenishment pump, and the oil replenishment oil circuit (23) is connected to the oil tank through the first oil replenishment pump.

9. The closed winch hydraulic system according to claim 6, characterized in that: The second oil replenishment mechanism includes a second oil replenishment pump, and the auxiliary oil circuit (20) is connected to the oil tank via the second oil replenishment pump.

10. A crane, characterized in that: A closed hoisting hydraulic system comprising the closed hoisting hydraulic system according to any one of claims 1 to 9.

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